About FileLark

Our one big idea

Most online file converters work the same way they did in 2005: you upload your file to someone else's server, wait in a queue, and hope the site deletes your data afterwards. FileLark was built on a simple observation — modern browsers are powerful enough to do all of this work themselves.

Every image conversion, resize, compression, and PDF operation on this site runs locally on your device, using the same web technologies (Canvas, WebAssembly, Web Workers) that power browser games and photo editors. Your files are never transmitted anywhere. That isn't a marketing promise that depends on our good behaviour — it's an architectural fact you can verify: open your browser's network tab while converting and you'll see zero uploads.

What that means for you

Privacy by design. Contracts, IDs, medical documents, and family photos are processed on your own computer. There is no server copy to breach, sell, or subpoena. No limits. Server-based converters cap file sizes and daily conversions because processing costs them money. Our conversions cost nothing to run, so there are no caps, queues, or paywalls. Speed. There is no upload or download round-trip — a 20 MB photo converts in about a second.

The one exception

Our Image to Prompt tool is the single feature that uses a server, because it sends your image to a vision AI model for analysis. Images are analysed over an encrypted connection and never stored. It's limited to five free generations per day to keep it sustainable.

How the site stays free

FileLark is supported by display advertising. Ads let us keep every tool free and unlimited without accounts, subscriptions, or "pro" upsells. We never sell user data — see our privacy policy for the details.

Get in touch

Found a bug, need a format we don't support yet, or want to say hi? Visit the contact page — we read everything.