Convert WEBM to MP4
Convert your WEBM video files to MP4 directly in your browser.
How to convert video in 3 steps
Choose a WEBM video file.
Click convert to MP4.
Download your MP4 video.
Format descriptions
WEBM — WebM is an open video container designed for the web. It uses VP8/VP9 and Opus codecs, offering small files and efficient streaming.
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.
Technical comparison: WEBM vs MP4
Technical breakdown of the WEBM and MP4 specifications: compression, colour, transparency and animation support.
| Property | WebM | MP4 |
|---|---|---|
| Specification | WebM (WebM Video Container) | MP4 (MPEG-4 Part 14) |
| Media type | Video | Video |
| Compression | Hybrid (lossy or lossless) · VP8 / VP9 / AV1 + Opus | Lossy · H.264 / HEVC + AAC |
| Color space / bit depth | YUV 4:2:0 | YUV 4:2:0, 8-10 bit |
| Transparency | Partial support | Not supported |
| Animation | Yes (animated) | Yes (animated) |
| Best for | WebM is an open video container designed for the web. It uses VP8/VP9 and Opus codecs, offering small files and efficient streaming. | 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. |
What happens when converting WEBM to MP4?
The WEBM data is decoded inside your browser with WebAssembly and re-encoded to the MP4 specification, so no file is ever uploaded to a server. MP4 uses lossy compression: the file gets far lighter, but a small amount of fine detail is discarded in the process. MP4 has no alpha channel, so transparent areas of WEBM are flattened onto a solid background colour.
Frequently Asked Questions
What is video conversion?
Video conversion changes a video file from one format to another, for example from WEBM to MP4, 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 WEBM video files to MP4, 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 MP4 format, ready to download and use.
About the video converter
Convert 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.
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- Convert WEBM to MKVConvert WEBM 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.
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