Convert WebM to MP4
Turn your WebM file into an MP4 that plays where you need it, with nothing to install.
- Free to start
- Nothing to install
- Up to 1GB
How to convert WebM to MP4
Upload your WebM file
Drag and drop a WebM file to turn into MP4, or click to browse. Anything under 1GB, and nothing is installed.
Confirm MP4 as the output
MP4 is already selected, so there is nothing to configure. Switch to another format in the panel if WebM needs to go somewhere else.
Convert and download
We convert the WebM on our servers, usually in under a minute. Create a free account to download the MP4.
Why convert WebM to MP4?
WebM is the open, royalty-free container built for the web. It is what most browser-based screen recorders produce, and VP9 packs the same picture into noticeably less data than H.264.
The practical problem: Most editing software, phones and TVs will not open a WebM file. Social platforms and messaging apps frequently reject the extension outright. Safari and older Apple devices handle WebM inconsistently.
MP4 solves that. Plays natively on every phone, browser, TV and editing app with no extra codecs. Every upload form accepts it, from YouTube and LinkedIn to Slack and email. H.264 keeps files small enough to send while still looking sharp at 1080p.
WebM is what browser-based recorders hand you, so this conversion is almost always the last step before a recording goes somewhere else: an editing timeline, a phone, a client, or a platform upload that refuses the extension. VP9 is more efficient than H.264, so the MP4 usually comes out slightly larger, which is the price of playing everywhere.
Container
Typical codecs
Best for
Plays on
File size
| Feature | WebM | MP4 |
|---|---|---|
| Container | WebM (Matroska-based) | MPEG-4 Part 14 |
| Typical codecs | VP8 / VP9 / AV1 video, Opus audio | H.264 video, AAC audio |
| Best for | Web embeds and browser recordings | Sharing anywhere, uploads, web embeds |
| Plays on | Chrome, Firefox and Edge; hit and miss elsewhere | Every phone, browser, TV and editor |
| File size | Very small at the same quality | Small for the quality |
WebM to MP4 questions
Is the WebM to MP4 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 MP4 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 WebM plays: Chrome, Firefox and Edge; hit and miss elsewhere. Where the MP4 you get back plays: Every phone, browser, TV and editor.
Does converting WebM to MP4 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 WebM on normal viewing. What changes is the container and the codec. MP4 holds: H.264 video, AAC 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. WebM: Very small at the same quality. MP4 coming back: Small for the 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.
Why is my screen recording a WebM file?
Browsers record with the MediaRecorder API, which produces WebM by default. It is efficient and streams well in Chrome, but most editors, phones and upload forms do not accept it.
Does the MP4 keep the audio from my WebM?
Yes. The Opus audio inside the WebM is re-encoded to AAC and stays in sync with the picture.
Other formats
Everything else you can do here.
Every conversion for a format
Convert to MP4
Convert to WebM
Convert to AVI
Convert to WMV
Convert to 3GP
Convert to M4V
Convert to MPEG
Convert to GIF
Convert to MP3
Convert to WAV
Convert WebM to MP4 now
Free, nothing to install, and the file stays open in a full video editor afterwards.