All tools / Video / MP4 to WEBM
Convert MP4 to WEBM
Convert MP4 to WEBM on your device. Choose your file, convert, and check the result before sharing.
Drop your .mp4 here
or click to browse
TO
Processed on your device - nothing is uploaded.
HOW IT WORKS
1
Drop the mp4 file
Add your MP4 video by dragging it in or browsing. It stays on this device.
2
Confirm WEBM
The video is re-encoded as WEBM using an encoder running in this tab.
3
Download
The WEBM file saves straight back - no upload, no queue, no copy kept.
Why convert here, not there
No upload, ever
A mp4 file can be hours of personal footage. This page re-encodes it where it already is - your device.
Local conversion
No upload bar crawling across the screen. Encoding begins the second you drop the file.
No account, no daily cap
As many conversions as you want, free, no account demanded.
The two formats, briefly
| MP4 | MP4 is a container. This converter writes H.264 video and AAC audio when an audio track is present; target-player support still needs checking. | |
|---|---|---|
| WEBM | WebM is a media container. This converter writes VP8 video at a fixed 1 Mbps with Vorbis audio when present. | |
When you need this
- Convert MP4 when your target app asks for WEBM or does not decode the codecs in the source. This tool re-encodes rather than simply renaming the file; test playback before discarding the original.
MP4 vs WEBM: what changes
| MP4 | WEBM | |
|---|---|---|
| Kind | Video | Video |
| Compression | Depends on source encoding | Depends on output encoding |
| Typical size | Depends on the file and encoding settings. | Measure the exported file; it may be larger. |
| Opens on | Check the source in your app and browser. | Check the downloaded file in the receiving app. |
| Best for | Keep the original as your source. | WEBM workflows, subject to the limits below. |
Keep the original. Compare the exported file before sharing or replacing it.
Good to know
- This path writes VP8 video at a fixed 1 Mbps with Vorbis audio when present. The quality menu does not alter that path; detailed video can lose visible detail.
- First use downloads the audio/video engine (about 30 MB). The input cap is 2 GB, but available browser memory can run out below that.
MP4 to WEBM, answered
Why convert MP4 to WEBM?+
Convert MP4 when your target app asks for WEBM or does not decode the codecs in the source. This tool re-encodes rather than simply renaming the file; test playback before discarding the original.
Which quality should I pick?+
This path writes VP8 video at a fixed 1 Mbps with Vorbis audio when present. The quality menu does not alter that path; detailed video can lose visible detail.
Does converting MP4 to WEBM lose quality?+
Video is re-encoded with lossy compression. Detail can change, and tracks, subtitles or metadata may not survive. Keep the original and inspect picture, sound and sync.
Is there a file size limit?+
The hard cap is 2 GB per file. The practical limit is your device: conversion runs in its memory, so very large files can fail on phones with little free RAM. There is no server-side cap because nothing is uploaded.
Does my file get uploaded anywhere?+
No upload, full stop. Everything between dropping the file and downloading the webm happens in your browser.