About Us

About uToolsLib

uToolsLib is a free collection of browser-based utilities for developers, designers, and anyone who works with structured data. It currently offers more than thirty tools covering formatting, validation, encoding, conversion, generation, and image and PDF processing.

Why this site exists

Most online developer utilities work the same way: you paste your data into a form, it is uploaded to a server, processed there, and the result is sent back. That is a reasonable engineering choice, but it means your data, which is often a configuration file, an access token, a database query, or a signed contract, ends up on infrastructure you do not control and cannot audit.

For the overwhelming majority of these tasks, the server round trip is unnecessary. Browsers can parse JSON, compute cryptographic hashes, re-encode images, and manipulate PDFs perfectly well on their own. uToolsLib was built on that premise: every tool here runs entirely in your browser, so the data you paste never leaves your device.

How the tools work

When you load a page on this site, the code for that tool is downloaded to your browser and runs there. Processing happens locally using standard web platform APIs: the built-in JSON parser, the Web Crypto API for hashing and random number generation, and the Canvas API for image work.

A practical consequence is that most tools keep working if you disconnect from the internet after the page has loaded. There is no backend processing your input, because there is no backend involved in the processing at all. The trade-off is that very large files are bounded by your browser's available memory rather than by server capacity.

What we collect

We do not receive, store, or log the content you paste into any tool. It is never transmitted, so there is nothing for us to retain. We do not require an account, and we do not ask for personal information to use the site.

The site uses standard web analytics to understand which tools are used and how pages perform, and displays advertising to cover hosting costs. Both involve third-party services that set cookies and collect usage data. The details, including how to opt out, are set out in our privacy policy.

Who maintains it

uToolsLib is built and maintained by a small independent development team. The tools are added and refined based on what we need in our own work and on feedback from people who use the site. If you have found a bug, want to suggest a tool, or have a question about how something works, you can reach us through the contact page.

Limitations worth knowing

• Because processing happens in your browser, very large files may be slow or may exhaust available memory. This is a genuine constraint of the local-processing approach, not something we can tune server-side.
• These tools are intended as practical utilities for development and everyday work. They are not certified for regulatory, legal, or safety critical use, and you should verify results independently where the outcome matters.
• Tools that depend on newer browser APIs may behave differently or be unavailable in older browsers.

The site is free to use, with no signup, no usage limits, and no paid tier.