Convert MOV to WEBM
Convert MOV files to WEBM entirely in your browser — no upload, no account, no watermark.
Your file never leaves your device — conversion runs entirely in this browser tab.
To convert MOV to WEBM, open the WEBM converter and drop your MOV file in. The conversion runs entirely inside your browser using WebAssembly, so the file is never uploaded. Common when preparing footage for a website.
What to expect from this conversion
Common when preparing footage for a website. If the MOV is ProRes the size reduction is dramatic. Encoding is slow — a ProRes source is large to read and VP9 is expensive to write — so do this on a desktop rather than a phone.
Apple’s QuickTime container. Often holds H.264, in which case it is essentially an MP4 — but when it holds ProRes it can be twenty times larger.
Lossy · video
Google’s open container, normally holding VP9 video and Opus audio. Excellent in browsers, poor on TVs and in editors.
Lossy · video
Both MOV and WEBM discard data to save space, so this conversion compresses something that has already been compressed. Always convert from your original file rather than from an earlier conversion — the losses compound.
How to do it
- Open the WEBM converter
Go to the WEBM converter and drop your MOV file onto it, or click to browse.
- Convert
Press Convert. FFmpeg runs in your browser and shows real progress as it works.
- Download
Download the finished WEBM file. It is created in your browser and never sent anywhere.
Common questions
How do I convert MOV to WEBM?
Open the WEBM converter, drop your MOV file onto it and press Convert. Everything runs in your browser — the file is not uploaded. Desktop browsers handle files up to about 200MB; mobile browsers about 40MB.
Does converting MOV to WEBM lose quality?
Yes, some. Both MOV and WEBM are lossy, so this is a second compression pass over data that was already compressed. The loss is usually modest, but always convert from your original rather than from a previous conversion.
Is it free to convert MOV to WEBM?
Yes, with no account, no watermark and no daily limit. The processing happens on your device rather than on a server, so there are no per-conversion costs to pass on.
Are my files uploaded when converting MOV to WEBM?
No. FFmpeg runs as WebAssembly inside your browser tab. The file is read from your disk, processed in memory and written back out — it never reaches a server.