About ReelShift

ReelShift is a single-purpose tool for converting video files between MP4, WebM, GIF, and MP3 — entirely inside your web browser, using a real build of FFmpeg compiled to WebAssembly. No file you select is ever uploaded to a server.

Because there is no server-side processing, ReelShift can stay completely free with no account, no watermark, and no file-size games. The site is supported by on-page advertising.

Larger files can take longer to convert on older devices, since the work happens on your own hardware rather than in the cloud. The first conversion on a given visit downloads a small (~30MB) engine that is then cached by your browser for every conversion after that.