Convert MP4 to WEBM
Pull the soundtrack out of any MP4 video and save it as WEBM in seconds. Conversion happens inside your browser, so even large or private videos are never uploaded.
Drop MP4 files here
MP3, WAV, FLAC, M4A, OGG, OPUS, AAC, AIFF, WMA, AMR, MP4, MOV & more · Processed on your device - nothing is uploaded
How to convert MP4 to WEBM
- Click "Choose files" or drag your MP4 videos onto the page.
- Make sure "WEBM" is selected as the output format (128 kbps is a good default).
- Optionally click Edit to trim, adjust volume or add effects.
- Click Convert, then Download your WEBM files.
Why convert MP4 to WEBM?
WEBM files are much smaller than video and play on any music player, phone or car stereo.
WEBM is best for web apps, HTML5 audio and browser-based recording. Chrome, Firefox, Edge, Android, VLC. Safari 15+.
Will I lose quality?
The audio is decoded from the MP4 video and encoded to WEBM. Choose a lossless format (WAV/FLAC) for zero loss, or a high bitrate for WEBM.
MP4 vs WEBM
| MP4 | WEBM | |
|---|---|---|
| Full name | MPEG-4 Video | WebM Audio (Opus) |
| Type | video | lossy |
| Best for | videos from phones, YouTube and social media | web apps, HTML5 audio and browser-based recording |
| Typical size | varies | ~0.9 MB at 128 kbps per minute |
| Compatibility | Universal video format. | Chrome, Firefox, Edge, Android, VLC. Safari 15+. |
| Developed by | - | Google (2010) |
MP4 to WEBM: questions
How do I convert MP4 to WEBM?
Open this page, add your MP4 file, make sure WEBM is selected as the output format and click Convert. Your WEBM file is ready to download in seconds.
Will converting MP4 to WEBM lose quality?
The audio is decoded from the MP4 video and encoded to WEBM. Choose a lossless format (WAV/FLAC) for zero loss, or a high bitrate for WEBM.
Is this MP4 to WEBM converter free and safe?
Yes. It's free with no watermark or sign-up. Files are processed locally in your browser, so your audio is never uploaded or stored on our servers.
Can I convert many MP4 files to WEBM at once?
Yes - add up to 5 files at a time on the free plan (unlimited with Pro), convert them all with one click and download them as a ZIP.
What is the difference between MP4 and WEBM?
MP4 (MPEG-4 Video) is a video format, the most common video format. We extract its soundtrack so you can save just the audio. WEBM (WebM Audio (Opus)) is a compressed (lossy) format: opus audio in a WebM container - the native format of browser recordings and YouTube audio streams.
Does it work on Mac, Windows, iPhone and Android?
Yes. The MP4 to WEBM converter runs in any modern browser - Chrome, Safari, Edge or Firefox - on desktop and mobile. No software to install.