Why a browser tool beats an upload form
Every tool here is built on something your browser already ships: its media decoders, a canvas, Web Crypto, the file APIs. That is not a limitation worked around; it is the entire design.
Private by architecture
Not "we promise not to look". On every tool here but one, there is no server that could receive your file, and you can prove it from the Network tab. The exception is file transfer, which sends your file to your other device and says on its own page exactly what it passes through.
Instant, even on huge files
Nothing waits in an upload queue. A multi-gigabyte video opens the moment you drop it, because it never moves off your disk.
Free without an asterisk
No account, no trial, no watermark, no daily cap, no "upgrade to download". Static files on a CDN cost almost nothing to serve, so nothing needs gating.
No install, any platform
No extension to trust, no app to update. Windows, macOS, Linux, ChromeOS, Android and iOS all get the same tool, because it is just a web page.
Keeps working offline
Once a page has loaded there is nothing left to call home to. Disconnect and the tools that work on your own files carry on exactly as before.
Keyboard-first and accessible
Single-key shortcuts drive the whole flow, focus order is real, and everything is labelled for a screen reader rather than left to a placeholder.