About FileWren

FileWren is a collection of small, focused file tools that run entirely in your web browser. Compress an image so it fits under an upload limit, convert a photo format your software doesn't accept, resize a picture to exact dimensions, split a PDF — each tool does one job, does it quickly, and does it without your file ever leaving your device.

How it works

When you open a tool on FileWren, your browser downloads the tool itself — the code that does the compressing, converting or resizing. When you pick a file, that code processes it locally on your computer or phone, using standard web technologies such as the Canvas API and WebAssembly. The result is saved straight from your browser to your device.

There is no upload step. Our server's only job is to deliver the page; it never sees, stores or touches your files. You can verify this yourself: open your browser's developer tools on the Network tab while using any tool, and you'll see no file data being transmitted.

Why we built it

Most "free online converters" quietly upload your documents to their servers. For a meme that's fine; for a passport scan, a signed contract or a visa application it shouldn't be necessary — and with modern browsers it isn't. Your device is more than powerful enough to do this work itself. We build tools around that idea: private by architecture, not by promise.

Free, supported by ads

All tools are free, with no accounts and no artificial limits. The site is supported by advertising, which appears alongside the tools and never interferes with them. Ads help pay for development and hosting — your files are never part of that equation, because we never have them.

Get in touch

Found a bug, or want a tool we don't have yet? Visit the contact page— tool suggestions are genuinely welcome and often become the next thing we build.