Convert MOV to WebM Online — No Upload, No Watermark
Converting MOV to WebM gives you a smaller, web-native file ready for HTML5 `<video>` tags, web app uploads, and Chrome/Firefox playback without an MP4 fallback.
Drag & drop your video here, or click to browse
Max file size: ~2 GB (memory permitting)
Where MOV files come from
This is the path from Apple capture to a web page. Footage arrives as MOV from an iPhone or a QuickTime export and needs to become a lightweight page asset.
What changes when you convert MOV to WebM
| Video | HEVC or H.264 re-encoded to VP9 |
|---|---|
| Audio | Re-encoded to Opus |
| File size | Typically 25 to 35 percent smaller than an equivalent MP4 |
Worth knowing first
This is the slowest conversion on the site: HEVC has to be decoded and VP9 encoded, both expensive, and both run on your own processor. A long 4K clip is not a good candidate. Trim to what you actually need first.
FAQ
How long will this take?
Longer than any other conversion here. Decoding HEVC and encoding VP9 are both demanding, and there is no server doing the work. Trim the clip to the part you need with the Video Trimmer before converting, which is usually the difference between a minute and twenty.
Is WebM the right format for my site?
For a modern audience, yes, with an MP4 fallback listed after it. If your visitors include older smart TVs or corporate machines on locked-down browsers, ship the MP4 first.
Will this work for an iPhone screen recording?
Yes. Screen recordings compress particularly well in VP9 because large parts of the frame do not change, so the saving is often larger than with camera footage.
Is this MOV to WebM converter really free and without upload?
Yes. The tool runs entirely in your browser using FFmpeg compiled to WebAssembly. Your MOV 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.