About

OnDevKit is a set of free tools for everyday files and data: images, PDFs, spreadsheets and configs, plus tools for developers such as JWT, certificate and regex tools. Every tool runs in your browser. Your input is processed on your own device and is never uploaded.

Why in the browser?

Many online tools send what you paste to their servers. That is a problem when the input is a production token, a private certificate, customer data or a company PDF. Modern browsers are fast enough to do this work locally, using JavaScript, WebCrypto and WebAssembly, so there is no reason to upload it.

How you can check

• Open your browser’s developer tools, go to the Network tab, and use any tool. You will see no requests carrying your input.
• Turn off your internet connection after the page loads. The tools keep working.
• Read the source code on GitHub.

How the site is paid for

Because nothing is processed on a server, the site costs very little to run: it is a set of static files served from one small server behind a CDN. There are no accounts and no paid tier.

Requests and bug reports

Missing a tool? Request it on GitHub. Found a problem?Report a bug.