Private by design
Your files never leave your device
Every ConvertOwl tool runs in your browser with WebAssembly. There is no upload, no queue, and no server that ever sees your files.
Why on-device conversion is better
Nothing is uploaded
Files are read and converted locally. Because nothing is transmitted, there is nothing to intercept, store, or leak.
No upload wait
Conversion starts the instant you drop a file — no round trip to a server and no processing queue behind other users.
No account, no tracking of files
There is no sign-up and no file history. We never build a profile from what you convert.
How it works
ConvertOwl ships the conversion engine — a small WebAssembly module — to your browser the first time you use a tool. Your file is decoded, transformed, and re-encoded entirely on your own machine, then handed back to you as a download.
That design has three consequences that matter:
- Privacy is structural, not a promise. A server can't misuse a file it never receives.
- Cost per conversion is near zero, which is how the tools stay free.
- Large files stay on fast local hardware instead of crawling through an upload.
The trade-off is honest: a few formats that need heavy server-side rendering aren't a good fit for the browser yet, and we say so on those tools rather than degrading quality.
Common questions
- Do my files really never get uploaded?
- Correct — for browser-based tools the conversion runs on your device and the file bytes are never sent to ConvertOwl or any third party. You can confirm this in your browser's network inspector: no upload request is made.
- Is there a file size limit?
- There is no server limit because there is no server. The practical ceiling is your device's memory; very large videos convert more slowly, and we warn you when a file is big enough to be slow.
- Does this work offline?
- Once a tool's engine has loaded, most conversions continue to work even if your connection drops, because the work happens locally in your browser.
Convert something privately
Pick a tool and drop a file — it stays on your device the whole time.