Calculate, convert, edit PDFs, check network information, and simplify everyday tasks with our free online tools.
The eight tools visitors open most often. Each one runs a real calculation or a real file operation — no fake results, no upsells.
Find a percentage of a number, work out a percentage increase, or compare two values.
Open tool →Combine several PDF files into one document. Files stay on your device while you work.
Open tool →Count words, characters, sentences and paragraphs while you type, with reading-time estimates.
Open tool →See the public IP address your connection is using, plus your ISP and network type.
Open tool →Turn any link, note or Wi-Fi password into a scannable QR code you can download as a PNG.
Open tool →Pretty-print JSON, find syntax errors with a line number, and minify it back again.
Open tool →Work out body mass index in metric or imperial units and see where it falls on the screening scale.
Open tool →Create strong random passwords and passphrases using the browser's secure random source.
Open tool →Twenty-seven focused utilities, grouped so you can find the one you need in a couple of clicks. Every tool has its own page with instructions and worked examples.
9 tools for everyday maths, health, money and currency questions.
7 tools that merge, split, compress and convert PDF files in your browser.
5 tools that query live network data through public resolver APIs.
6 tools for writing, encoding and generating data.
Three steps, the same for every tool on the site. If a tool needs anything more, the page tells you before you start.
Search by name or browse the four categories. Every tool opens on its own page with a plain-language introduction and worked examples.
Type into clearly labelled fields. Validation tells you straight away when a value is missing, impossible or out of range — before you get a result.
Calculations update as you type and can be copied or reset. File tools produce a real download you can open, with no account and no watermark.
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Percentages turn up in every discount, invoice, salary review and interest calculation. This calculator covers the four versions of the question: what is X% of Y, how much a value rose or fell, what share of a total one number represents, and what a figure becomes after a percentage increase or reduction. Choose the calculation, enter two numbers, and read the answer with the working shown next to it.
Multiply the number by the percentage, then divide by 100. For 20% of 150 that is 150 × 20 ÷ 100 = 30. Shifting the decimal two places to the left on the percentage is the same shortcut.
A percentage change is measured against the starting value: $80 rising to $100 is a 25% change. A percentage point is the gap between two percentages themselves, so a rate moving from 20% to 25% has risen by 5 percentage points — which is a 25% increase on the rate itself.
Yes. A negative percentage reduces the base figure, so 20% of −150 returns −30. Negative numbers are accepted in both input fields.
Enter a date of birth and this calculator reports age the way people actually say it — whole years, months and days — rather than a flat division of milliseconds. It also totals the days, weeks and hours you have been alive, names the day of the week you were born on, and counts down to your next birthday. Use the target date field to check age on a past or future date, such as the age a child will be on a school start date.
Yes. The calculator works from the real calendar rather than assuming every year is 365 days, so February 29 birthdays and years containing 29 February are counted correctly.
Calendar months have different lengths. The calculator counts completed calendar months and then the remaining days, so a person born on 31 January is a month older on 28 February than a straight 30-day division would suggest.
No. The calculation runs entirely in your browser and the date is never sent to a server. Closing or reloading the page discards it.
Body mass index compares your weight to the square of your height using the same formula used in clinical screening. Enter your measurements in either metric or imperial units and the calculator returns the BMI value, the screening band it falls into, and the weight range that would place the same height inside the healthy band. It also shows the metric equivalents so you can check your figures against a printed chart.
No. BMI is a population-level screening measure that does not distinguish muscle from fat, and it says nothing about blood pressure, cholesterol or body composition. It is a rough indicator for adults, and it is not designed for children, pregnancy or athletes. Talk to a doctor for anything that affects your health.
In metric units, BMI is your weight in kilograms divided by your height in metres squared. In imperial units, the equivalent shortcut is 703 multiplied by your weight in pounds and divided by your height in inches squared.
The reference ranges used for adults are not calibrated for children, and body composition changes with age and training. This calculator applies the standard adult screening bands and states that limitation rather than pretending the number is a verdict.
Work out what a loan really costs before you sign for it. Enter the amount borrowed, the annual interest rate and the repayment term, and the calculator applies the standard amortisation formula to produce the monthly payment, the total interest over the life of the loan and the total amount repaid. The first year of repayments is broken down month by month so you can see how much of each payment goes to interest and how much reduces the balance.
The monthly rate is the annual rate divided by twelve, and the payment is principal multiplied by the monthly rate and one plus that rate to the power of the number of payments, divided by that same figure less one. This is the formula lenders use for standard fixed-rate repayment schedules.
No. The figure covers principal and interest only. Arrangement fees, credit insurance, mortgage insurance, overdraft interest and early-settlement charges all change the real cost, so treat the result as an estimate and confirm the final figure with the lender.
It is an arithmetic estimate produced in your browser. Rates offered by lenders depend on credit checks, the security, the market and the borrower, so only a lender can quote a binding price.
A mortgage payment is more than the loan repayment, so this calculator builds the whole monthly cost. Enter the property price, your deposit, the interest rate, the term and your annual property tax and insurance, and it returns the monthly principal and interest, the monthly tax and insurance, the combined figure that leaves your account, and the total interest you pay across the term. It also shows the amount actually borrowed after your deposit.
Homeowners association dues, mortgage insurance where it applies, utilities, maintenance and closing costs are all excluded. Add them yourself if you want a full housing budget.
No. It models a level fixed-rate payment over a fixed term with no overpayments, which is the standard starting point. Use the amortisation table from the loan calculator if you want to model paying more than the scheduled amount each month.
The arithmetic is currency-neutral, but tax and insurance rules differ widely. The calculator shows the property tax as a simple annual percentage of the price so you can enter the rate used in your area.
How many days between two dates? This calculator answers that in several useful ways at once: the exact number of days, the equivalent in weeks, months and years, the day of the week on both dates, and the count of weekdays excluding weekends. It is built for practical questions — counting down to a deadline, checking how long a contract has left to run, counting the working days between a start and end date, or working out a project timeline.
The standard convention is used: the gap is the number of midnights between the two dates, so 1 January to 2 January is one day. Both dates are counted for calendar months and years in the breakdown.
No. Working days means Monday to Friday. Public holidays vary by country and are not built in, so subtract them yourself if your deadline depends on them.
Months and years use whole completed calendar units measured from the earlier date, then the remaining days are reported. That matches the way a contract or a probation period is normally counted.
Work out exactly what a sale price costs and how much you are saving. Give the calculator the original price and the discount percentage and it returns the price you pay, the money saved and the share of the original price that remains. Working the other way round is just as common: if you know the price you are paying and the discount advertised, the same tool works backwards to reveal the original price before the reduction.
Divide the price you are paying by the remaining percentage. If the item cost $81 after 10% off, the remaining percentage is 90, so $81 ÷ 0.90 gives the original $90.
Apply the discount first, then add tax to the reduced price. On a $100 item with 20% off and 10% tax, the result is $88, not $90, because tax is charged on the discounted amount in most jurisdictions. Check your local rule.
The calculator handles one percentage reduction at a time. For a second discount, press Calculate again and feed the resulting sale price into the tool as the new original price.
A full scientific calculator for everyday work and study. Type an expression such as 12 × (3 + 4) ÷ 2, or build it with the on-screen keypad, and the calculator evaluates it using a proper expression parser rather than a text shortcut. Trigonometric functions, logarithms, powers, roots, factorials, constants and a running history of previous results are all supported, with the choice of degrees or radians for the angle functions.
sin, cos, tan, asin, acos, atan, log (base 10), ln, sqrt, cbrt, exp, abs, floor, ceil, round and factorial. The constants pi and e are also available, along with the power operator ^ and modulo %.
Use the caret for powers, so 2^8 is 256. For roots use the function names: sqrt(16) is 4 and cbrt(27) is 3. You can also type them directly if you prefer the keyboard.
No. The expression is parsed and evaluated inside your browser, so nothing is uploaded and nothing is stored. The history list lives only in the page and is cleared when you reload.
Convert money between more than a hundred currencies using published exchange rates, and see how far a pair has moved over a chosen period. The converter loads one rate table and then does every calculation in your browser, so the amount you type never leaves the page — only the currency codes travel with the request for the rates themselves. Use it to check what an overseas price costs in your own money, to compare a supplier's quote against the market rate, or to track a pair since you last looked.
Today's rates come from the open.er-api.com public exchange rate service, which publishes a table of rates against a base currency together with the time that table was last updated. The tool shows the source and that timestamp so you can judge how current the figures are, and the Refresh rates button fetches a newer table. If that service cannot be reached, the tool falls back to the Frankfurter API, which republishes the European Central Bank reference rates for 30 currencies.
No. Only the currency codes are sent, and only because a published rate table is keyed by currency. Your amount, and every result the tool produces, stay inside your browser and are never transmitted or stored. The amount is not part of any request the page makes.
No. This is a mid-market reference rate. Banks, card issuers and money transfer services add their own margin on top of it, and some currencies carry fees, controls or settlement differences that change the amount you actually receive. Treat the figure as an indication, and check with your provider before you commit money.
Daily history comes from the Frankfurter API, which publishes the European Central Bank reference rates for 30 currencies: the euro, the US dollar, the pound, the yen, the Swiss franc and the major Nordic, Central European, Asian and emerging-market currencies. Currencies outside that list still convert live, but they have no daily series, so the rate history panel explains that rather than returning an empty chart.
Combine several PDF files into a single document in the order you want. Add files with the file picker, drag them into position, and press Merge — the tool rebuilds one continuous document with every page in sequence. The whole operation happens inside your browser using the pdf-lib library, so your documents are read from your device and never uploaded to a server.
No. The merge runs entirely in your browser. The files are read from your device by the pdf-lib library, combined in memory and handed back to you as a download. Nothing is transferred to us or to any third party, and nothing is retained once you leave the page.
There is no hard limit in the tool, but very large combined documents take longer and use more memory. Merging a few dozen files is comfortable on a modern phone or laptop; beyond that, split the job into batches.
Page content, vector graphics and text are preserved. Interactive form fields and internal document bookmarks are not carried across, because the output is rebuilt as a new document. Fill in forms before merging if you need the values kept.
Separate a PDF into smaller documents without installing anything. Choose to break the file into one document per page, pull out specific page ranges, or chop it into fixed-size chunks. When the split produces more than one file the tool bundles them into a ZIP archive so you download everything in a single click; when it produces a single file you get that PDF directly.
Separate each part with a comma. Use a hyphen for a continuous run, so 1-3, 7, 12-14 means pages one to three, page seven, and pages twelve to fourteen. Spaces are ignored and page numbers start at 1.
Because the split produced more than one document and browsers will only save one file at a time. The archive contains every part, named after the original file and the pages it contains. Most phones and computers open ZIP archives automatically.
No. The source file is only read. The split documents are newly built in memory and your original stays exactly as it is on your device.
Reduce the size of a PDF so it fits an upload limit or an email attachment. The tool re-renders every page to an image at the resolution you choose and re-encodes it with the JPEG quality you set, then rebuilds the document from those optimised pages. You get a clear before-and-after comparison of the real file sizes, and if the result would be larger than the original the tool tells you so instead of handing you a worse file.
Yes, and it is important to be clear about why. Pages are rendered to images at the resolution you pick, so very small text can soften at low settings and the text is no longer selectable or searchable. For a document you need to keep as clean text, leave it alone and reduce file size by exporting from the original application instead.
Image-heavy scans often shrink by 70% or more. Files that are already compressed or that contain mostly small text often cannot be reduced further, because there is little redundant data left to remove. The tool always shows the actual result rather than an estimate.
No. Rendering and re-encoding happen in your browser. The file is read from your device, processed in memory and returned to you as a download.
Turn the pages of a PDF into ordinary JPG or PNG images you can upload, embed or send. Choose the resolution you need, optionally limit the conversion to a range of pages, and the tool renders each page with the pdf.js renderer and gives you the images. A single page downloads directly; several pages are bundled into a ZIP archive so you only save one file.
72 DPI is screen quality and keeps files small. 150 DPI is the usual choice for printing and for text you need to read. 300 DPI is for images you plan to zoom into or print at a large size, and it produces much heavier files.
Not directly. The renderer cannot open an encrypted document, and the tool reports that the file could not be opened rather than producing an empty result. Remove the password first, then convert it.
No. Pages are rendered on your device with the pdf.js library and encoded there. Nothing is uploaded, and the images exist only in your browser's memory until you download them.
Build a PDF document from photos and screenshots without printing or scanning. Add JPG, PNG or other image files, set the page size and orientation, and the tool lays each image onto its own page with the margins you choose. Everything is assembled in your browser with pdf-lib, so the images never leave your device and the finished document is ready to download straight away.
JPG and PNG go straight into the document without any loss. Other formats such as WEBP, GIF, BMP and HEIC are converted to JPEG in your browser first, which means they are re-encoded rather than embedded untouched.
Yes. Each file in the list has up and down arrows, and the page order follows that list. The order you select is the order the pages appear in the PDF.
The limit is your device's memory rather than a fixed rule. Very large images from modern phone cameras can be slow to embed; if the tool appears stuck, downscale the photos first or convert them in smaller batches.
Fix a document that scans or prints the wrong way round. Rotate every page by 90, 180 or 270 degrees, or target specific pages only by listing their numbers. The rotation is written into the new file as a real page property, so the document opens correctly in any reader and prints correctly — no viewer-specific workarounds involved.
It turns the page. The rotation is stored as a property on the page, which is the same mechanism a scanner or a printer uses, so the page dimensions stay as they were and the content simply appears at a different angle.
Enter the page numbers separated by commas, for example 2,5,9. Leave the box empty and the rotation is applied to every page in the document instead.
No. The original is opened read-only and a new, rotated document is written for you to download. Your source file is untouched on your device.
Put a PDF's pages back in the right order. The tool lists every page with its original number, and you move them up, down, to the front or to the back until the sequence reads correctly. The new document is built by copying the pages into your chosen order, so the output is a genuinely reordered PDF rather than a set of bookmarks pointing at the original file.
No. The file is read in your browser and the reordered version is written straight to your downloads. We never receive it and have nothing stored.
Not in this tool — it works on a single document. To combine pages from two PDFs and then order them, merge the two files first and reorder the result in one more step.
Page content and embedded annotations travel with their page. Internal links that pointed to a specific page may end up pointing at a different page once the order changes, which is the same behaviour you get in desktop PDF software.
See the public IP address your connection is currently using, along with the network it belongs to. The page asks the ipify.org lookup service for your IPv4 and IPv6 addresses and then asks ipwho.is for the matching network details, so you get the real address and the real ISP rather than a guess. Nothing about you is stored: each lookup happens in your browser the moment you open the tool.
Two. The address itself comes from ipify.org, and the network, location and ISP information comes from ipwho.is. Both are public IP lookup services that answer one-off queries. Each service sees the request, and therefore your IP address, at the moment you use the tool.
IPv6 is only assigned if your ISP has enabled it and your router is configured to use it. On an IPv4-only network the tool reports that no IPv6 address was returned rather than showing a placeholder.
It often does. Most residential connections use dynamic addressing, so your public address changes when you reconnect or reboot your router. A static address, common on business lines, stays the same.
Find out which internet protocol version your connection supports, and check whether a specific address is valid IPv4 or IPv6. The live check asks ipify.org for both address families and reports what your network actually supports, including whether you are running dual stack. The manual check takes any address you paste in and confirms the format, the version and the useful facts about it, such as whether it is a private range.
Dual stack means your connection carries both protocol versions at the same time, so the site you visit can use whichever it prefers. Single stack means only one version is available, and if it is IPv4 only then IPv6-only websites will not load for you.
A private address, such as 192.168.x.x or 10.x.x.x, is used inside your own network and is rewritten to a public address by your router. The public address is the one the rest of the internet sees, and it is what this tool reports.
No. Validating an address is pure arithmetic on the text you typed, so the check is done locally and nothing is sent anywhere. Only the live connection check contacts a lookup service.
See what the Domain Name System holds for any domain. The tool queries Google Public DNS for the record type you choose and returns the real answer with the time-to-live values attached, so you can confirm which servers host a site, where its mail is routed, which addresses it resolves to and what verification records have been published. It is the quickest way to check a DNS change after you have made one.
The query is sent to Google Public DNS, which resolves records using the same authoritative servers your own resolver would. Results may differ from your local resolver if a record has just changed and the TTL has not expired anywhere.
Status 0 means the query succeeded. Status 3 is NXDOMAIN, meaning the domain or record does not exist. Status 2 is SERVFAIL, meaning the server could not answer, usually a misconfiguration or a DNSSEC problem. The tool explains the code it receives.
The TTL on the existing record controls it. Until that value has expired, resolvers that have already cached the old answer will keep returning it. Checking the TTL in the results shows you how long is left.
Inspect the raw HTTP response a website returns, including the status line and every header the server sends. Use it to confirm a redirect is working, check whether security headers such as HSTS and Content-Security-Policy are present, or see what caching and content-type rules a site applies. The request is made by the HackerTarget header inspection API, which fetches the page from its own servers and returns the response headers verbatim.
The HackerTarget API fetches the page from its own infrastructure and returns the response headers. That means the headers shown are the ones a visitor receives, and your browser makes no direct request to the site you are checking.
The API cannot reach sites that block its requests, that require a login, or that sit behind a firewall that blocks outside requests. In those cases it returns an explanatory message and the tool shows that message rather than an empty result.
No. The request is anonymous, so anything behind a login returns a redirect or an unauthorised status. That is usually still useful information, since it confirms the page is protected.
Look up the network behind any public IP address. Enter an address and the tool queries the ipwho.is database for the registered network operator, the autonomous system number and organisation, the approximate city and country, the local time zone and the address family. It is useful for checking where a server you have never heard of is located, and for sanity-checking a range of addresses before you allow them in a firewall rule.
It is derived from the address block registered to the network operator, so it usually identifies the right city and country but not a precise street or building. Location accuracy is limited for mobile networks, where the address may belong to a relay point some distance from the handset.
Not meaningfully. Private ranges such as 10.0.0.0/8, 192.168.0.0/16 and 127.0.0.1 are not routed on the public internet, so no database holds information about them. The tool reports that the address is private rather than inventing a result.
We do not keep a log of the addresses you search for. The query goes from your browser to ipwho.is, which is a third-party service with its own privacy policy and its own logging practices.
Count the words, characters, sentences and paragraphs in your text as you type, with no upload and no waiting. Alongside the raw counts the tool estimates reading and speaking time, finds the average and longest word length, and lists the most frequent words in the passage. It is built for students checking an essay length, writers hitting a submission limit, and editors sizing a piece before sending it on.
Text is split on whitespace after punctuation is separated, so "well-known" counts as one word and a dash between words does not create a third. Numbers and hyphenated terms are treated as single words.
No. The counting happens in your browser as you type, so the text never leaves your device and is not stored anywhere. Closing the tab discards it.
Reading time uses 200 words per minute and speaking time uses 130 words per minute, both common estimates for adult English. Both round up to the next whole minute so a short passage does not show as zero.
Check exactly how many characters your text uses before you paste it somewhere with a limit. The counter reports characters with and without spaces, lines, and the number of characters left against the limits that matter most — a social post, a text message, a page title, a meta description and a profile headline. A bar turns red when you go over, so you can trim as you type rather than after pasting.
Characters with spaces counts every visible character including the gaps between words. Characters without spaces removes them. Most platforms count with spaces, but some form fields count without, which is why both are shown.
Emoji count as characters, and line breaks count as one character each. Note that some platforms count an emoji as two characters because of how they are encoded, so leave a little headroom when you are right on the limit.
No. Platforms change their limits from time to time, and the values shown here are the widely used limits at the time of writing. Treat them as a guide and check the current limit on the platform itself if it matters.
Change the capitalisation of a block of text in one click. The tool covers the everyday styles — uppercase, lowercase, title case, sentence case — plus the developer formats camelCase, PascalCase, snake_case, kebab-case and CONSTANT_CASE, and the awkward ones such as alternating case. The output appears in a separate panel so the original text stays intact, and you can copy the result or download it as a text file.
It capitalises every word, including short ones such as "of" and "the". If you want only the important words capitalised, most house styles prefer sentence case, which this tool also produces.
camelCase starts with a lowercase letter, so userProfileSettings. PascalCase starts with a capital letter, so UserProfileSettings. The rest of the word breaks are identical.
Only the case, plus the spacing in the code-style formats where a space is replaced by an underscore or a hyphen. Punctuation, numbers and word order are left exactly as you typed them.
Tidy up a block of JSON and find out straight away whether it is valid. Paste a response, an API payload or a config file and the tool parses it, reformats it with your choice of indentation and shows the result with syntax colouring. When something is wrong it points at the exact line and column of the problem and explains the usual cause, instead of just saying the JSON is invalid.
The most common causes are a trailing comma after the last item in an object or array, single quotes instead of double quotes, unquoted keys, and comments, which JSON does not allow. The error panel points at the position where parsing stopped.
No. Parsing happens in your browser with the built-in JavaScript JSON parser, so the content of your payload never leaves the device. This matters if the JSON contains tokens, keys or personal data.
Formatting adds indentation and line breaks so a human can read the structure. Minifying removes them, which makes the payload smaller. Both produce identical data — only the whitespace differs.
Create a scannable QR code for a link, a Wi-Fi network, a contact card, an email, a phone number or any text you type. The code is generated in your browser with the qrcodejs library and drawn on a canvas, so you can download a clean PNG at any size. Preset buttons build the encoded payload for you, and the error-correction level controls how much of the code still scans if it gets partly covered.
No. The code is drawn on a canvas inside your browser and the PNG is produced from that canvas. Your content never reaches a server, which matters for a Wi-Fi password or a private link.
Level L recovers about 7% of the code, M about 15%, Q about 25% and H about 30%. Higher levels make the code denser, so it is harder to scan at a distance, but it keeps working when a logo covers the middle or the code is printed on a scuffed surface.
The usual causes are too little contrast between the two colours, printing the code too small, or not leaving a clear margin around it. Use the default dark-on-light colours, print at least 2 cm across, and keep the quiet zone around the code empty.
Create passwords that no pattern or dictionary attack can guess. The generator draws each character from the browser's cryptographic random source using rejection sampling, so every character is equally likely and the result carries the full entropy of its length. Set the length, choose which character sets to include, require at least one of each, and copy the result straight to your clipboard. A passphrase mode produces a readable multi-word alternative.
No. It is produced by the Web Crypto API inside your browser using crypto.getRandomValues, and it never leaves the page. There is no copy on any server, because there is no server involved.
For an account that also has two-factor authentication, 16 characters or more of random text is comfortable. For the password protecting your password manager itself, use a longer passphrase. Length matters more than symbol variety, so raising the length is usually the better trade.
No. Reuse means a single breach exposes every account you have. Generate a different password for each site and let a password manager remember them. If you must reuse, at least generate a fresh one for the account that protects your email.
ZMZ Tools is a collection of free, browser-based utilities built by Expert Solution Media LLC. Everything on this site exists to save you a few minutes on a task that is genuinely fiddly: working out a percentage, combining a stack of scanned PDFs, checking whether your connection speaks IPv6, or cleaning up a JSON payload before pasting it into a ticket.
There are four families of tools. Calculators cover everyday arithmetic, age, body mass index, loan and mortgage repayment, date differences, discounts, scientific expressions and live currency conversion. PDF utilities merge, split, compress, rotate and reorder documents and convert between PDF and image formats. The network group inspects your public IP address, checks IPv4 and IPv6 support, resolves DNS records and reads HTTP response headers. The text group counts words and characters, changes letter case, formats and validates JSON, generates QR codes and creates secure passwords.
Every calculation is implemented in plain JavaScript that runs on your device, and every network tool calls a named public service whose behaviour is described on the page that uses it. Where a result depends on assumptions — loan fees, tax treatment, body composition, the accuracy of an IP geolocation database — the page says so rather than hiding the caveat.
We do not sell personal data, we do not ask you to create an account to use a tool, and we do not place a result behind a sign-up form. Where advertising appears it is clearly labelled and kept visually separate from the interactive controls, so a download button never looks like an advert.
Every tool page carries its own original explanation, step-by-step instructions, worked examples and frequently asked questions. That content exists to help you, not to pad the page. It is written for the tool it sits next to, so the loan calculator explains amortisation and the QR code generator explains error correction, rather than both repeating the same filler text.
ZMZ Tools is operated by Expert Solution Media LLC. We are a small independent operation rather than a large platform, and the site is funded by the advertising that appears on it. That is the reason the tools stay free, and the reason we are careful about how advertising is separated from the tools themselves.
Corrections are welcome. If a calculation looks wrong, an explanation is unclear, or a tool stops working on your device, please tell us through the contact page and we will look at it.
Found a calculation that looks wrong, a tool that fails on your device, or a question about how the site handles your data? Send a message using the form below and it will arrive in the same inbox that maintains the tools. If you are reporting a broken tool, please include your device and browser so the problem can be reproduced.
This policy explains what ZMZ Tools does with information when you use the site. It is written to be read, not to be skimmed past. The short version is that most tools never send your data anywhere at all, the network tools contact the named public lookup services, this site's optional analytics script stays switched off until you agree to it, and advertising is served by Google under Google's own consent message.
ZMZ Tools is operated by Expert Solution Media LLC. For any question about this policy or about data held by the operator, use the contact page and choose a privacy or data question.
Every calculator, every PDF utility and every text and developer tool on this site runs as JavaScript inside your own browser. When you drop a PDF into the merge tool, open the JSON formatter, or type into the password generator, that file or text is read and processed locally. It is not transmitted to us, it is not written to a server, and it is gone the moment you close or reload the page. We cannot access it because it never reaches us.
The IP, network and currency tools are different, because answering them requires a server somewhere to answer the question. Those requests are made from your browser directly to the services below, and each service sees your IP address at the moment you use the tool. We do not proxy, store or log the responses, and we do not build a profile of what you looked up. The currency converter sends only the currency codes you select, plus the date range when you look up a rate history. The amount you type is never part of a request and never reaches us.
| Service | Used by | What it receives |
|---|---|---|
| ipify.org | What Is My IP, IPv4 & IPv6 Checker | Your public IP address |
| ipwho.is | What Is My IP, IP Address Information | The IP address being looked up |
| dns.google | DNS Lookup | The domain name you searched for |
| api.hackertarget.com | HTTP Headers Checker | The website address you checked |
| cdnjs.cloudflare.com | PDF and QR code tools | An ordinary request to download a JavaScript library |
| api.allorigins.win | HTTP Headers Checker — fallback route only | The website address you checked, passed through this proxy |
| open.er-api.com | Currency Converter — live exchange rates | The currency codes you select, to retrieve the published rate table |
| api.frankfurter.app | Currency Converter — daily rate history and fallback rates | The two currency codes and the date range you choose |
If you use the contact form, we receive the name, email address, subject and message you type. We use it for one purpose: replying to you. We keep those messages for as long as it takes to handle the request and any follow-up, and we do not use them for marketing or pass them to anyone else. If you would like your message deleted once it has been dealt with, say so in the message and we will remove it.
We set one cookie of our own, called zmz_consent, which records the choice you made in the cookie banner so we do not ask again. It is required for the site to work and cannot be switched off. The analytics script on this site is not loaded at all until you accept it in that banner. The Google AdSense script is a different case: it is included in the HTML of every page, because Google's crawler reads the page source to confirm the code is there before a site can be reviewed and approved, so it cannot be held back until a visitor agrees. Where the law requires consent before personalised advertising — the EEA, the UK and Switzerland — Google's own certified consent message asks for it, and until you agree, ads are served in a limited, non-personalised form. You can change your mind at any time from the Manage control in the banner, and you can review and change Google's own advertising cookies at adssettings.google.com. The Cookie Policy sets out the details.
We do not keep a history of which tools you use. The only records we hold are the contact messages you choose to send, which are kept until the matter is resolved. The site is served over HTTPS, so the data in transit between your browser and the site is encrypted. You can ask us to show you what we hold about you, to correct it or to delete it by using the contact page.
The site is a general-purpose utility site and is not directed at children. We do not knowingly collect personal information from anyone under the age of 13.
If this policy changes we will update the wording on this page. Material changes will be noted on the page itself. Continuing to use the site after a change means the updated policy applies from that point on.
These terms cover your use of ZMZ Tools, the free utilities operated by Expert Solution Media LLC. Using the site means you accept them. They are written plainly; if any part of them is unclear, contact us and we will explain it.
You may use every tool on this site free of charge, for personal or commercial work, without asking permission. You may not attempt to disrupt the site, overload it with automated requests, scrape it at a rate that degrades it for others, or attempt to bypass the advertising that funds it.
The calculators produce arithmetic results from the figures you enter. They are estimates and general information, not professional, financial, legal, medical or tax advice. A loan or mortgage figure in particular excludes fees, insurance and charges that will change the real cost, and a body mass index is a population screening measure rather than a medical assessment. Take advice from a qualified professional before you act on anything you calculate here.
PDF and text tools process your content locally in your browser, and we never receive it. You keep all rights to everything you bring to the site and to everything you produce with it. You are responsible for having the right to use the files you process, and for keeping your own copies of anything that matters to you.
Some tools rely on external services: public IP lookup providers, a public DNS resolver, an HTTP header inspection API, a public exchange rate service and the CDN that hosts the JavaScript libraries. Those services are operated by other companies under their own terms and privacy policies, and their availability and accuracy are outside our control. A tool may fail if one of them is unreachable.
The site is intended to be funded by advertising. Advertisements are clearly labelled and kept visually distinct from the tools, their buttons and their download controls. We do not control the content of third-party advertisements or the sites they link to, and we do not endorse them.
The site and its tools are provided as is. We do not warrant that the tools will be uninterrupted, error free, or fit for a particular purpose, and we do not accept liability for loss arising from their use, including decisions made on the basis of a result. To the fullest extent permitted by law, our total liability is limited to the amount you paid for the service, which is nothing.
The ZMZ Tools name, the site design and the original written content on each page belong to Expert Solution Media LLC. The open-source libraries the tools are built on remain under their own licences. You are welcome to link to any page on this site.
We may add, change or remove tools and update these terms. Continued use after a change means the updated terms apply. Questions about any of this can be sent through the contact page, which is the fastest route to a reply.
This page lists every cookie and similar storage the site can set, explains what each one is for, and tells you how to change your mind. The site sets one essential cookie of its own, and its optional analytics script stays switched off until you agree to it in the banner at the bottom of the screen. Advertising on this site is served by Google, and Google's own consent message asks before personalised ads are served in the regions where the law requires it.
The site sets a single first-party cookie called zmz_consent. It stores the answer you gave in the consent banner — for example that you accepted optional analytics, or that you accepted only essential storage. Without it the banner would reappear on every page, so it is required for the site to behave as you chose. It contains no identifier that identifies you personally, and it expires after roughly six months.
| Cookie | Purpose | Type | Duration |
|---|---|---|---|
| zmz_consent | Remembers your consent choice | First party, essential | About 6 months |
If you turn on analytics in the banner, the site loads Google Analytics, which records how visitors move around the pages so we can see which tools people actually use. Analytics cookies are set only after you opt in, and they are not set at all if you decline. With analytics switched off we have no page-by-page record of your visit beyond the ordinary technical logs any web host keeps to serve the page.
This site is funded by Google AdSense. The AdSense script is included in the HTML of every page, because Google's crawler needs to find it in the page source before the site can be reviewed and approved. Google may set cookies and use them to select ads, to limit how often you see the same advert, and to measure performance. Google may also use your activity across other sites to show ads you have not blocked. Where the law requires consent before personalised advertising — the EEA, the UK and Switzerland — Google's own certified consent message asks you first, and until you agree, ads are served in a limited, non-personalised form. Cookies set by Google are governed by the Google privacy policy rather than by this one, and you can review and change them at adssettings.google.com.
You can change this site's optional storage choices at any time by opening the Manage preferences control in the cookie banner and saving a different selection. The banner is always available from the footer, whether you accepted earlier or not. Advertising preferences are controlled by Google: use the consent message Google shows you, or your own settings at adssettings.google.com. You can also block or delete cookies in your browser settings, and most browsers offer a way to block third-party cookies for a particular site. Blocking the essential consent cookie simply means the banner will ask again on your next visit.
Your browser may send a Do Not Track signal. We honour it for the optional scripts this site controls itself — currently the analytics script — by not loading them at all when it is present. The AdSense script is included in the page source rather than loaded on request, because Google's crawler requires it to be there before the site can be reviewed; for advertising, use Google's consent message or your own settings at adssettings.google.com.
Some tools keep temporary information in your browser's local storage so it survives a page change, for example while you reorder PDF pages. That data lives only in your browser, is cleared when you clear your browsing data, and is never sent to us.
Every page on ZMZ Tools is listed below. The tools are grouped by category, followed by the company and legal pages. Each link opens the tool directly.
We built the site we wanted to use ourselves: quick answers, clear limits and no dark patterns.
Each tool does one job properly, with the formulas written out and the assumptions listed. We do not publish tools we have not tested.
One clear input area per tool, a reset button, copy-to-clipboard and sensible defaults. No account, no email wall, no upsell.
PDF and text tools run entirely in your browser — your files are never uploaded. Network and currency tools say which external service they query. No fingerprinting.
Keyboard-friendly controls, visible labels, good contrast and reduced-motion support. Where results are estimates, we say so plainly.
Short, useful explanations written for people solving a real problem — not filler articles.
Almost every percentage question is one of three shapes: find a part of a whole, find what part a number is, or find the change between two numbers. Once you recognise which shape you have, the formula is short.
Attachment limits are usually around 10–25 MB, and most oversized PDFs are oversized because someone scanned them at 300 dpi. The fix depends on what the document is.
Your IP address identifies the network connection your device is using. It is a routing label, not a personal identity, but it can be narrowed down to a rough area.
Length beats complexity. A long passphrase of ordinary words is easier to recall and far harder to crack than a short string of symbols, and it is far less likely to end up on a sticky note.
Every PDF and text tool processes files inside your browser. Nothing is uploaded, stored or shared by us.
IP, DNS, header and currency tools query the public services named on their pages, so those services see your IP address and the codes you enter.
Google's advertising script sits in the page source so its crawler can verify the site, and Google's own consent message asks before personalised ads are served. Our analytics script is only loaded once you accept it.
Straight answers about cost, privacy, accuracy and advertising.
Yes. Every calculator, PDF utility, network tool and text utility on this site is free to use, with no account, no trial and no feature locked behind a payment. The site is intended to be supported by clearly labelled advertising so that it can stay free for everyone.
No. The PDF tools (merge, split, compress, convert, rotate and reorder) run entirely inside your browser using JavaScript libraries that are downloaded from a public CDN. Your file contents never leave your device. The network tools are different by nature — they query external services, and each of those pages names the service it contacts.
No. There is no sign-up, no login and no email required for any tool on the site. Nothing you type is stored between visits.
No. They are arithmetic helpers. Every financial tool page lists the assumptions it makes (fixed rate, monthly compounding, constant payments, taxes and insurance estimates) and states plainly that the output is an estimate for planning, not advice. Speak to a licensed financial adviser before making a decision.
No. Body mass index is a population-level screening measure that compares height and weight. It cannot distinguish muscle from fat, and it is not appropriate for children, pregnancy or some medical conditions. It is a quick estimate, never a diagnosis.
It is approximate. The city shown comes from commercial IP geolocation databases maintained by network operators, and those records are frequently out of date. If you are behind a VPN or proxy, the result shows the VPN's location rather than yours. Treat the output as a hint, not a fact.
They are the published mid-market reference rates, refreshed daily, which is the closest thing to a fair rate that exists. They are not the rate your bank will offer: providers add their own margin, and some currencies carry fees, controls or settlement differences that change what you actually receive. The converter names the service the rates came from and the date the table was published, so you can judge how current the figure is, and the amount you type is never sent to that service.
Advertising on this site is served by Google AdSense and appears only in areas marked “Advertisement”, clearly separated from the tools. We do not ask anyone to click an ad, we do not disguise ads as buttons or downloads, and we do not use pop-ups or interstitials that block the page. The AdSense script is included in the HTML of every page, because Google's crawler has to find it there before the site can be reviewed and approved. Where the law requires consent before personalised ads, Google's own consent message asks for it, and until you agree, ads are served in a limited, non-personalised form. You can review and change Google's advertising choices at adssettings.google.com.
Network tools rely on public APIs: ipwho.is for address information, api.ipify.org for the raw public address, dns.google for DNS-over-HTTPS, and api.hackertarget.com for HTTP header inspection, with a single fallback proxy used only if the header service is unreachable. The currency converter uses open.er-api.com for the live rate table and api.frankfurter.app for daily rate history and as a fallback if the first service cannot be reached. Fonts are loaded from Google Fonts and the PDF, ZIP and QR code libraries from a public CDN. Each of these receives your IP address simply because your browser contacts them.
ZMZ Tools is operated by Expert Solution Media LLC. The About page explains what the site offers and how the business is identified, and the Contact page has a message form that reaches the same inbox.