All tools / Video / WEBM to MP4
Convert WEBM to MP4
Convert WEBM to MP4 on your device. Choose your file, convert, and check the result before sharing.
Drop your .webm here
or click to browse
TO
Processed on your device - nothing is uploaded.
HOW IT WORKS
1
Drop the webm file
Add your WEBM video by dragging it in or browsing. It stays on this device.
2
Confirm MP4
The video is re-encoded as MP4 using an encoder running in this tab.
3
Download
The MP4 file saves straight back - no upload, no queue, no copy kept.
Why convert here, not there
No upload, ever
Cloud video tools take your webm onto their disks. This one keeps it in your tab.
Local conversion
There is no file-upload step. Click Convert to start; the engine may need to load before conversion begins.
No account, no daily cap
No queue position, no throttling, no watermark burned into the mp4.
The two formats, briefly
| WEBM | WebM is a media container. This converter writes VP8 video at a fixed 1 Mbps with Vorbis audio when present. | |
|---|---|---|
| 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. | |
When you need this
- Convert WEBM when your target app asks for MP4 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.
WEBM vs MP4: what changes
| WEBM | MP4 | |
|---|---|---|
| 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. | MP4 workflows, subject to the limits below. |
Keep the original. Compare the exported file before sharing or replacing it.
Good to know
- Balanced is the default H.264 setting. High and Max use less aggressive compression, but the result is still re-encoded and can be larger than the source.
- 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.
WEBM to MP4, answered
Why convert WEBM to MP4?+
Convert WEBM when your target app asks for MP4 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?+
Balanced is the default H.264 setting. High and Max use less aggressive compression, but the result is still re-encoded and can be larger than the source.
Does converting WEBM to MP4 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?+
Never. Your webm file stays inside this tab; the mp4 is produced by code on your device. Its contents never leave your device.