WebM to MP4 converter
Turn a WebM recording into an MP4, which more editors, phones and chat apps usually accept. Upload one file up to 500 MB. Free, no account needed.
- Input
- WebM files
- 出力
- MP4
- Limit
- Up to 500 MB
- Price
- Free, no account
Turn an idea into a video
Give Storybook a topic or an article link. It makes an illustrated video with narration and music.
How to convert WebM to MP4
- 01
Choose your WebM file
Drop it on the box or pick it from your device. The limit is 500 MB per file.
- 02
Confirm MP4
MP4 is already selected in Convert to. Select Convert, and a short security check runs first.
- 03
Download the MP4
Select Download when the conversion finishes. Download links expire after one day.
More in コンバーター
All 33 toolsWhy convert WebM to MP4?
WebM is the format browsers use for web video and screen recordings. Many editors, messaging apps and upload forms ask for MP4 instead.
- Why leave WebM. Many editors, messaging apps and upload forms do not accept WebM.
- Why use MP4. MP4 suits sharing, uploads, phone recordings, and web playback.
- Your rights. Convert only files you own or have permission to use.
What the MP4 contains
The converter first tries to copy the WebM's video and audio into the MP4 without compressing them again. If that fails, it encodes H.264 video and AAC audio.
Open the MP4 in the app that rejected the WebM before you delete the original.
Transparent backgrounds are lost
MP4 does not support transparency. If your WebM has a transparent background, the MP4 will show a solid one.
When WebM to MP4 helps
- A video editor will not import the WebM.
- A messaging app or upload form only accepts MP4.
- A browser screen recording needs to play on a TV or media player.