RecBeamFree tool
Convert WebM to MP4
Turn WebM screen recordings into MP4 files that play everywhere: Windows, Mac, iPhone, Android, PowerPoint and video editors.
- Free, no watermark
- Files stay on your device
- No sign-up
Drop your WebM file here
or
Choose a file to start. It is processed in your browser and never uploaded.
WebM to MP4 in three steps
Choose your file
Drop a WebM file into the box above or pick one from your computer.
Convert in your browser
RecBeam's converter runs on your own device, so nothing is uploaded anywhere.
Download
Preview the result and save it. No watermark, no account.
Why convert WebM to MP4
Chrome and many screen recorders save WebM. MP4 (H.264 + AAC) is the format almost every device, editor and upload form accepts.
Record it right the first time
RecBeam records your screen, camera and voice in Chrome and gives you a shareable link the moment you stop. Free to start.
Get RecBeam for ChromeHow to convert WEBM to MP4
- Drop your WEBM file (or files) onto the page, or choose them from your computer.
- Press Convert. Everything runs in your browser, so a progress bar shows the work on your own device.
- Download the MP4 result.
About WEBM and MP4
WebM is an open, royalty-free video format created for the web. It usually holds VP8, VP9 or AV1 video with Opus or Vorbis audio, and it plays in Chrome, Edge and Firefox. Many phones, TVs and editing programs handle it poorly or not at all.
MP4 is the most widely supported video container. It usually holds H.264 video with AAC audio and plays on phones, TVs, editing software, social platforms and every major browser.
When to convert WEBM to MP4
Convert when you need the video to play on a phone or TV, open in an editor, upload to a platform that rejects WebM, or send to someone on an older device. Chrome-based screen recorders commonly save WebM.
Tip
Convert once, from the original file, and keep the original until you have checked the MP4.
Your files stay on your device
This tool runs in your browser. Your files are not uploaded to RecBeam or anywhere else, there is no sign-up and nothing is added to your file. Browse all the free tools.
WebM to MP4: frequently asked questions
Will my video lose quality?
The video is re-encoded to H.264 at high quality (CRF 23). For screen recordings the difference is very hard to see, and the MP4 is usually a similar size.
Why is my WebM file not playing on iPhone or PowerPoint?
Some apps and devices do not support WebM. Converting to MP4 fixes that.
Is it really free?
Yes. There is no price, no account, no watermark and no limit on how many files you convert.
Are my files uploaded?
No. The conversion runs entirely in your browser on your own computer. Your video never leaves your device.
Is there a file size limit?
Files up to about 1 GB work well. Very large files depend on your computer's memory and can be slow.
Why does the first conversion take longer?
The first time, your browser downloads the converter (about 30 MB). It is cached after that.