About this site

Why this exists

We kept needing something small. Count the words in a paragraph. Work out what 18% of a bill is. Resize a photo before sending it. Every time, the first search result wanted a cookie decision, a newsletter, an account, and three adverts around a box that did about four lines of work. Worse, a good number of them posted the text to a server to do something the browser can do on its own in under a millisecond.

So we built the versions we wanted: one job to a page, the answer visible without scrolling, and nothing leaving the machine. It grew from a handful into 851, mostly because every time we needed one that was missing we added it. If you need one that is missing, tell us and we will probably do the same.

Nothing is uploaded

The tools are JavaScript running in your own tab. When you paste text into the word counter or drop a photo into the resizer, that content is handled by your machine and never sent anywhere. This is checkable rather than a promise: open the network tab in your browser, use any tool, and watch it stay empty.

The same design means the tools keep working after the page has loaded. Turn the network off and they carry on, because there is nothing left to fetch.

No account, no tracking

There is nothing to sign up for. There are no analytics scripts, no advertising, and no cookies set by this site. Fonts are served from this domain rather than from Google, so no third party is told which pages you open.

Why some tools are missing

A tool is published only when it does one job properly and can explain how. That rules out a few things people expect to find. Anything needing a live lookup, such as a domain record or a currency rate, would mean sending your input to a server, which is the one thing this site does not do. Converters that cannot really parse the format they claim to convert were removed rather than left in place, because a tool that quietly gets it wrong is worse than no tool.

Each page carries a plain-language explanation of the method, a worked example, the cases where it breaks down, and a link to the standard it follows where one exists.

Put a tool on your own site

Every tool page has a "Put this on your own site" panel that builds an iframe snippet. The embedded version shows the input and output and nothing else, and you choose the accent and background colours. It runs in your reader's browser exactly as it does here, so their input reaches neither you nor us.

Browse

The 9 subjects below hold everything. Search is faster if you know roughly what you want, and it understands descriptions as well as names, so "kg to pounds" finds the weight converter.

• Data & Formats
• Code & Dev
• Web & API
• Security & Crypto
• Text & Language
• Images & Graphics
• Numbers & Units
• Dates & Time
• Everyday

The ones people ask for by name: Word Counter, JSON Formatter, QR Code Generator, Password Generator, Image Resizer, Case Converter, Color Picker, Regex Tester, Percentage Calculator, BMI Calculator and Age Calculator.

This is a shortlist. All 851 tools sit under the subjects above.

Tell us what is broken or missing

Write to info@utils.tools. A tool giving the wrong answer is the message we most want to get, so send the input you used and what you expected and we will fix it or say why the result is right. If a tool you need is not here, describe the job rather than the name: knowing what you were trying to work out is what makes a good version of it possible, and if it can run in a browser we will build it.

Anything else is welcome too. A confusing label, a page that reads badly on your phone, a default that is wrong for your country. It is a small team, so a reply can take a few days.