Convert MP4 to WEBM
Convert your MP4 video files to WEBM directly in your browser.
How to convert video in 3 steps
Choose a MP4 video file.
Click convert to WEBM.
Download your WEBM video.
Format descriptions
MP4 — MP4 is the most widespread and compatible video container. It supports H.264/HEVC and AAC codecs, making it ideal for streaming, the web and mobile devices.
WEBM — WebM is an open video container designed for the web. It uses VP8/VP9 and Opus codecs, offering small files and efficient streaming.
Technical comparison: MP4 vs WEBM
Technical breakdown of the MP4 and WEBM specifications: compression, colour, transparency and animation support.
| Property | MP4 | WebM |
|---|---|---|
| Specification | MP4 (MPEG-4 Part 14) | WebM (WebM Video Container) |
| Media type | Video | Video |
| Compression | Lossy · H.264 / HEVC + AAC | Hybrid (lossy or lossless) · VP8 / VP9 / AV1 + Opus |
| Color space / bit depth | YUV 4:2:0, 8-10 bit | YUV 4:2:0 |
| Transparency | Not supported | Partial support |
| Animation | Yes (animated) | Yes (animated) |
| Best for | MP4 is the most widespread and compatible video container. It supports H.264/HEVC and AAC codecs, making it ideal for streaming, the web and mobile devices. | WebM is an open video container designed for the web. It uses VP8/VP9 and Opus codecs, offering small files and efficient streaming. |
What happens when converting MP4 to WEBM?
The MP4 data is decoded inside your browser with WebAssembly and re-encoded to the WEBM specification, so no file is ever uploaded to a server. Both formats rely on comparable compression, so file size and perceived quality stay in the same range.
Frequently Asked Questions
What is video conversion?
Video conversion changes a video file from one format to another, for example from MP4 to WEBM, while keeping the video content.
Are my video files uploaded?
No. This tool processes video files directly in your browser. Your video files are never sent to a server.
Which video formats are supported?
This tool converts MP4 video files to WEBM, all in your browser.
Is it really free and unlimited?
Yes, the tool is completely free and you can convert as many video files as you want, with no limits.
Does it work on mobile too?
Yes, it works on any modern device, including smartphones, tablets and desktop computers.
Which format will the result be in?
The converted file will always be in WEBM format, ready to download and use.
About the video converter
Convert MP4 to WEBM video online for free. Everything happens in your browser: your files are never uploaded to a server, and you need no downloads or sign-up to get started.
See also:
- Video Converters
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- Convert MP4 to MKVConvert MP4 to MKV video online for free. Everything happens in your browser: your files are never uploaded to a server, and you need no downloads or sign-up to get started.
- Convert MP4 to AVIConvert MP4 to AVI video online for free. Everything happens in your browser: your files are never uploaded to a server, and you need no downloads or sign-up to get started.
- Convert WEBM to MP4Convert WEBM to MP4 video online for free. Everything happens in your browser: your files are never uploaded to a server, and you need no downloads or sign-up to get started.