About KitWren
KitWren (kitwren.com) is a free online tools and English-learning website. It isn’t connected to any person, author or artist of a similar name.
KitWren is one place for the small jobs that come up every day: working out a percentage or a loan repayment, converting units or currency, shrinking a PDF, resizing a photo, formatting some JSON or putting together an invoice. Instead of searching for a different website each time, you can search here in plain words and go straight to the right tool.
Why KitWren exists
Everyday jobs online had become oddly hard. Shrinking a PDF meant uploading your payslip to a stranger’s server; converting a photo meant an app full of pop-ups; a “free” tool turned out to need an account, add a watermark or stop after three files. Learning English well was even harder to do for free.
KitWren exists to be the opposite: one trustworthy place where the small jobs — and a complete English course — are genuinely free, work on any device, and keep your files on your device wherever possible. Like the wren, a small bird that gets a lot done, it tries to be small, quick and useful.
How KitWren works
- Your files stay on your device. All PDF, image and text tools — and the calculators and converters — do their work inside your web browser. When you choose a file, it’s processed on your own computer or phone and never uploaded to us. You can check this yourself: see online tools that never upload your files.
- No accounts. There’s nothing to sign up for. Things like your English course progress and favourite tools are saved in your own browser, on your device, rather than in an account on our servers.
- Funded by advertising. Ads and clearly labelled partner links pay for the site, so the tools and lessons can stay free. Analytics and personalised advertising only run if you agree to them — see the cookie policy.
- Checked, not guessed. Calculators show their formulas, converters use standard definitions, and lessons are checked by automated tests before they’re published. If you find a mistake, tell us and we’ll fix it.
What we believe
- Useful first. Every tool should work properly, explain its answer and handle mistakes gracefully.
- Free and open to everyone. No account is needed to use the tools. The site is supported by advertising and clearly labelled partner links, never by paywalls.
- Private by default. Wherever possible, tools run in your browser, so your files and data stay on your device. When a tool does need our server, the page says so.
- Honest. We don’t show fake usage numbers, fake reviews or misleading download buttons.
Accuracy
We test our calculators against published formulas and examples, and each page shows the formula it uses. Financial, tax, health and legal results are estimates for information only — please confirm important decisions with a qualified professional or the official source.
Get in touch
Found a bug, a wrong answer, or a tool you wish existed? Email hello@kitwren.com or see the contact page. You can also browse every tool or read our privacy policy.