WEBM – WebM
WebM is an open video format for the web using VP8/VP9 or AV1 video with Vorbis or Opus audio. All major browsers play it.
More WEBM conversionsDrop your WEBM files here
or click to choose WEBM files · up to 95MB each
How to convert WEBM to MP4
- Choose your files. Click Select File or drag your WEBM files into the upload box. You can add many at once.
- Pick the settings. MP4 is already selected as the output format. The conversion starts as soon as a file is added.
- Download. Each file appears in the list when it is ready. Download them one by one, or all together with Download all.
Why convert WEBM to MP4?
WebM is the video format of many browsers and screen recorders. iPhones, older Windows apps, video editors and social networks often prefer MP4. Converting makes the video play and upload everywhere.
When to keep the WEBM
Keep the WebM for embedding on your own website; browsers play it well and it is often smaller.
Tips for the best result
- The result uses H.264 video and AAC audio, the most compatible MP4 combination.
- Odd frame sizes from screen recordings are adjusted by one pixel where H.264 needs even dimensions.
- Resolution is kept.
Common problems and fixes
- The MP4 is larger than the WebM.
- H.264 is less efficient than the VP9 or AV1 inside many WebM files. That is the price of wider compatibility.
- The recording has no sound.
- Some browser recorders save video only. The MP4 will be silent too.
MP4 – MPEG-4 Part 14
MP4 is the most widely supported video container. It usually holds H.264 or H.265 video with AAC audio and plays on nearly every phone, computer, TV and browser.
More MP4 conversionsConverting WebM to MP4
- Re-encoded with widely compatible codecs (H.264/AAC for MP4, MOV, MKV; VP9/Opus for WebM).
Frequently asked questions
Can I upload the MP4 to Instagram or WhatsApp?
Yes. H.264 and AAC in MP4 is what these services recommend.
Will the WebM transparency be kept?
No. MP4 with H.264 does not support transparent video.
How do I convert WEBM to MP4?
Click Select File or drop your WebM file onto the upload box. The converted MP4 appears in the list below with a download button. You can add many files at once and download them together as a ZIP.
Is it really free?
Yes. There is no sign-up and no watermark. To keep the service available for everyone there is a 95MB limit per file and a cap on how many files one connection can process in a short period.
Are my files stored?
Your upload is used only to make the converted file. Images are processed in memory; other files are written to a private temporary folder that is deleted as soon as the conversion finishes. Nothing is kept after the result has been sent back.
Will quality drop?
For images, a little, by design: the image is re-encoded at the Quality you choose (default 75%). Audio and video are re-encoded with high-quality settings; documents keep their text and layout as far as the target format allows. Converting never restores detail that is already missing from the original.
How this works: your file is uploaded over HTTPS and converted on this server with open-source engines (libvips for images, FFmpeg for audio and video, LibreOffice and Pandoc for documents, Calibre for ebooks, Ghostscript and Inkscape for PDF and vector files). Images are processed in memory; other files use a private temporary folder that is deleted as soon as the conversion finishes.