Every converter here — video, image, audio, PDF, developer tools — runs entirely in your browser. That one architectural choice is where everything below comes from.
Your files are processed by your own browser and never uploaded anywhere. Contracts, ID scans, family photos, database passwords — we never see them, and neither can anyone in between, because nothing is transmitted. There is no server that could leak, retain, or sell your data.
Once a tool has loaded, you can turn off your Wi-Fi and it keeps working — that is the proof that nothing leaves your device. The site installs as an app, and any tool you have opened before works without a connection.
No 25 MB upload caps, no "premium for files over 100 MB". A 2 GB video converts the same as a 2 MB one, because there is no upload at all. *The practical bound is your own device’s memory.
Classic converters upload your file to a data center, process it there, and send it back — every step burns bandwidth and server energy. Here, the device already in your hands does the work once, and nothing crosses the network. No server farms churning on your files.
One tool per page, sensible defaults, and conversion starts right after you drop a file. No account creation, no email confirmation, no "your file is ready — now log in" tricks.
Every tool is fully functional and free. Your outputs are yours: no watermark stamped on the result, no locked features behind a paywall, no daily conversion quota.
Skipping the upload and download round trip usually beats any server, especially on large files. Video conversion uses your device’s hardware encoder when available — 4K converts at full resolution in minutes, not upload-hours.
Under the hood run the same engines professionals use — FFmpeg for video and audio, ImageMagick for images, qpdf for PDF encryption, pdf.js and pdf-lib for documents — compiled to WebAssembly so they run safely inside your browser.
Add OnMyDevice to your home screen or desktop from the browser menu and it opens like a native app — with the same guarantee that everything stays on your device.
*No artificial limits are imposed by us; very large files are bounded by the memory of the device doing the work — which is yours.