Turn your WebM file into an MP4 that plays where you need it, right in your browser.
Drag and drop the file, or click to browse. Files up to 500 MB are supported, and nothing is installed.
MP4 is already selected, so there is nothing to configure. You can switch formats in the panel if you need to.
We convert on our servers, usually in under a minute. Create a free account to download the MP4, or keep editing the file in REQO.
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.
| 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 |
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.
No. The conversion runs on our servers and the whole flow happens in your browser, so it works the same on Windows, macOS, Linux, iPhone and Android.
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. Converting the same file back and forth repeatedly will eventually show, so keep your original.
Up to 500 MB per file. For anything bigger, trim or compress it first, both are free tools here.
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.
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.
Yes. The Opus audio inside the WebM is re-encoded to AAC and stays in sync with the picture.
To MOV
Turn your WebM file into a MOV that plays where you need it, right in your browser.
OpenTo GIF
Turn your WebM file into a GIF that plays where you need it, right in your browser.
OpenTo MP3
Pull the audio out of your WebM file and save it as MP3, right in your browser.
OpenTo MP4
Turn your MOV file into an MP4 that plays where you need it, right in your browser.
OpenTo MP4
Turn your AVI file into an MP4 that plays where you need it, right in your browser.
OpenTo MP4
Turn your MKV file into an MP4 that plays where you need it, right in your browser.
OpenFree, in your browser, and the file stays open in a full video editor afterwards.