Why private conversion matters
Most “free online converters” ask you to upload a video or photo to their servers. That means your file is copied, often logged, sometimes stored, and occasionally scanned or shared with partners. For personal clips, work footage, or sensitive screenshots, that is a real risk.
What happens on typical converter sites
- Your file is uploaded over the network.
- A server process converts it (or queues it).
- You download the result — but a copy may remain on their disk or CDN for hours or days.
- Privacy policies often allow logging, analytics, and third-party access.
How ConvertFlow is different
ConvertFlow uses FFmpeg compiled to WebAssembly and the browser’s own canvas APIs. Conversion runs entirely on your device. The file never leaves your computer. There is no account, no upload endpoint, and no server-side processing of your media.
The only network requests are for the static website and the FFmpeg engine scripts (loaded once from a CDN). Your video and images stay local.
When in-browser conversion is ideal
- Personal and family videos
- Screenshots, memes, and social posts
- Work drafts you prefer not to send to a third party
- Quick format changes without installing software
Very large files (multi‑GB) can still be slow in the browser; for those, a desktop tool may be more comfortable. For everyday sizes, private in-browser conversion is both safer and often good enough.