About Subtrate

Subtrate is 20 small, free tools — image, PDF, text, developer, and generator utilities — that all run entirely in your browser. No file or text you touch here is ever uploaded to a server.

Why client-side only

Most "free online tools" quietly upload your file to do the work, then delete it (or don't). Subtrate does the processing with your browser's own JavaScript, canvas, and WebAssembly APIs — the file never leaves your device, so there's nothing to trust us with in the first place.

What we won't do

No account walls, no artificial usage limits, no ads before you get your result. One ad slot, shown after — never blocking the tool itself.

What's next

New tools ship regularly. See what's currently planned on the roadmap.