Convert WebM to MOV Online — No Upload, No Watermark
Final Cut Pro, iMovie, and DaVinci Resolve on Mac all reject WebM by default. Converting to MOV lets you drag the clip straight onto the timeline.
Drag & drop your video here, or click to browse
Max file size: ~2 GB (memory permitting)
Where WebM files come from
The usual case is browser-recorded footage heading into an Apple editing timeline, where a WebM will not import at all.
What changes when you convert WebM to MOV
| Container | WebM rewritten as QuickTime MOV |
|---|---|
| Video | VP8 or VP9 re-encoded to H.264 |
| Audio | Opus re-encoded to AAC |
Worth knowing first
The result is H.264 in a MOV, not ProRes. Final Cut will import it, but editing long H.264 clips is slower than editing an intermediate codec, and any transparency in the WebM is lost because H.264 cannot carry an alpha channel.
FAQ
Why will Final Cut not open my WebM?
Apple has never shipped VP8 or VP9 decoders for its editing tools, so the file is unreadable to them regardless of how it is wrapped. The video has to be re-encoded to a codec Final Cut knows, which is what happens here.
My WebM has a transparent background. Does it survive?
No. VP9 supports alpha and H.264 does not, so transparency flattens onto black. To keep it in an Apple workflow you need ProRes 4444, which requires desktop software.
Should I convert before or after editing?
Before. Editors handle a file they can decode natively far better than one they are fighting, and converting first avoids repeated re-decoding on every playback.
Is this WebM to MOV converter really free and without upload?
Yes. The tool runs entirely in your browser using FFmpeg compiled to WebAssembly. Your WebM file never leaves your device — open the DevTools Network tab to verify zero uploads. No signup and no watermark. The practical size limit is the memory your browser gives this tab, which is generous on a computer and a few hundred megabytes on a phone.