Convert MP4 to WebM
Turn your MP4 file into a WebM that plays where you need it, with nothing to install.
- Free to start
- Nothing to install
- Up to 1GB
How to convert MP4 to WebM
Upload your MP4 file
Drag and drop a MP4 file to turn into WebM, or click to browse. Anything under 1GB, and nothing is installed.
Confirm WebM as the output
WebM is already selected, so there is nothing to configure. Switch to another format in the panel if MP4 needs to go somewhere else.
Convert and download
We convert the MP4 on our servers, usually in under a minute. Create a free account to download the WebM.
Why convert MP4 to WebM?
MP4 is the closest thing video has to a universal format: an MPEG-4 container that almost always holds H.264 video and AAC audio, which every browser, phone, TV and social platform can play without a plugin.
The practical problem: MP4 is already the safest format, so the usual reason to convert away from it is a specific destination that wants something else.
WebM solves that. Streams natively in Chrome, Firefox and Edge with no plugin. VP9 delivers smaller files than H.264 at the same visual quality, which cuts bandwidth on a busy page.
Convert to WebM when the file is destined for a web page rather than a person. VP9 typically delivers the same picture in noticeably less data than H.264, which shows up directly in page-load times on a video-heavy site. For anything a human will download or upload elsewhere, stay with MP4.
Container
Typical codecs
Best for
Plays on
File size
| Feature | MP4 | WebM |
|---|---|---|
| Container | MPEG-4 Part 14 | WebM (Matroska-based) |
| Typical codecs | H.264 video, AAC audio | VP8 / VP9 / AV1 video, Opus audio |
| Best for | Sharing anywhere, uploads, web embeds | Web embeds and browser recordings |
| Plays on | Every phone, browser, TV and editor | Chrome, Firefox and Edge; hit and miss elsewhere |
| File size | Small for the quality | Very small at the same quality |
MP4 to WebM questions
Is the MP4 to WebM converter free?
Yes. Convert and preview the result for free, then create a free account to download it. There is no per-file charge and no watermark on the WebM itself beyond the free-plan badge.
Do I need to install any software?
No. The conversion runs on our servers and you use it from a browser tab, so it works the same on Windows, macOS, Linux, iPhone and Android. Nothing to install at either end. Where MP4 plays: Every phone, browser, TV and editor. Where the WebM you get back plays: Chrome, Firefox and Edge; hit and miss elsewhere.
Does converting MP4 to WebM reduce the quality?
Converting re-encodes the video, so it is not bit-for-bit identical. We encode at a high quality target, which keeps the result visually indistinguishable from the MP4 on normal viewing. What changes is the container and the codec. WebM holds: VP8 / VP9 / AV1 video, Opus audio. Converting the same file back and forth repeatedly will eventually show, so keep your original.
How large a file can I convert?
Anything under 1GB per upload, which is more footage in some formats than others. MP4: Small for the quality. WebM coming back: Very small at the same quality. For anything bigger, trim or compress it first, both are free tools here.
Is my file kept private?
Your upload is processed and then held only as long as your project needs it. Nothing is published, indexed or shared unless you create a share link yourself.
Other formats
Everything else you can do here.
Every conversion for a format
Convert to MP4
Convert to WebM
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Convert to WMV
Convert to 3GP
Convert to M4V
Convert to MPEG
Convert to GIF
Convert to MP3
Convert to WAV
Convert MP4 to WebM now
Free, nothing to install, and the file stays open in a full video editor afterwards.