Convert Video changes a clip from one format to another — MP4, WebM, MOV or MKV — so it plays on the device, editor or platform you need. MP4 with H.264 is the safe choice almost everywhere, while WebM is smaller and web-native. The whole conversion runs in your browser with FFmpeg.wasm, so your file is never uploaded.
Drag an MP4, MOV, WEBM, MKV or AVI file onto the page, or click to browse. It loads straight in — no upload.
Choose MP4, WebM, MOV or MKV. The tool defaults to a format different from your source.
Export to re-encode the clip into the new format and download it instantly.
Video conversion changes a clip from one container and codec to another — MP4, WebM, MOV or MKV — so it plays on the device, editor or platform you need. Convert Video does this in your browser with FFmpeg compiled to WebAssembly, so even a large file is re-encoded on your own machine and never uploaded.
People convert video for compatibility: an editor that only accepts MP4, a website that prefers the smaller WebM, or a phone that wants MOV. Converting rewrites the video into the target format while keeping it looking as close to the original as possible.
You pick a target format and export; the tool re-encodes with H.264 for MP4/MOV/MKV or VP9 for WebM, pairing each with a widely-supported audio codec.
A video file has two parts people often confuse: the container and the codec. The container (MP4, WebM, MOV, MKV) is the wrapper that holds the video, audio and metadata together. The codec (H.264, VP9) is how the actual picture is compressed inside it.
Converting can mean changing either. Sometimes only the container changes and the streams are copied; more often the codec changes too, which requires re-encoding every frame. This tool re-encodes to guarantee the output plays cleanly in the chosen format.
MP4 with H.264 is the safe universal choice — it plays virtually everywhere. WebM with VP9 is smaller and web-native but less compatible with older software. MOV suits Apple workflows, and MKV is a flexible container for archiving.
| Use case | Recommended | Result |
|---|---|---|
| Plays everywhere | MP4 | Universal compatibility |
| Web-optimised | WebM | Smaller file |
| Apple / QuickTime | MOV | Native playback |
MP4 (H.264) plays on virtually every device and app. Pick WebM for smaller, web-optimised files, or MOV/MKV when a specific tool requires them.
The clip is re-encoded once at a high-quality setting, so any change is minimal. Converting to WebM uses VP9; the others use H.264.
For GIFs, use the dedicated Video to GIF tool — it builds a colour palette for clean, band-free animation.
Yes — Convert Video is completely free. There's no account, sign-up, watermark or limit on the core tool.
No. This tool runs entirely in your browser — your file is processed on your own device and never leaves it. The only network request is an anonymous usage counter.
No. It runs in any modern browser — Chrome, Edge, Safari, Firefox, Brave — with nothing to download or install.