Convert MP4 to WebM Online in Seconds
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Step 1: Pick or drop your MP4 file above.
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Step 2: Our cloud engine converts it to WebM automatically.
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Step 3: Click Download to save the WebM and share it anywhere online.
MP4 to WebM Converter
Upload any MP4, from quick clips to multi‑gig 4K files; Converter App converts it into a web‑ready WebM fast. We accept files over 1 GB, and you can queue the next video right after the current one finishes.
Optimized WebM Output
We encode VP9 video with Opus audio for sharp quality at lower bitrates, ready for Chrome, Firefox and Edge. Safari support varies, and embedded captions or chapters from MP4 are not kept, so test playback and add an MP4 fallback or new tracks on your site.
Free to Use
Converter App is free. There are no watermarks, no length caps and no daily limits. Large uploads are welcome; only fair‑use safeguards apply in extreme cases.
WebM Output and Fallbacks
Converter App outputs VP9/Opus WebM that keeps your original resolution and frame rate for a faithful look. For maximum reach, publish the WebM and keep your MP4 as a fallback for Safari versions that lack support.
Why Converter App?
Our fast cloud engine handles big 4K sources without setup or software installs, then delivers your WebM quickly. Submit one video at a time and start the next right away to keep your workflow moving.
Privacy Built In
Transfers use encrypted connections. Your videos are automatically deleted from our servers shortly after conversion, and only you can access the download link.
What to expect when converting MP4 to WEBM
Real numbers from every conversion on this tool since 24 October 2026. Nothing here is estimated: we record how long each job took and how large the files were. File names and contents are never stored.
Expected time by file size
How long conversions take
share of all conversions
- under 1 s<1%
- 1–10 s41%
- 10–60 s42%
- 1–5 min12%
- over 5 min5%
Times are server processing only, measured after the upload finished; upload and download are not included. Large files take longer, but the limit is the same for everyone: no account, no queue priority to buy. Updated 2026-11-11