WEBM to MP4 Converter
Convert WEBM files to MP4. Processed inside your browser — files never leave your device.
Drop your WEBM file here
or click to choose
Choose fileHow to use
- Drop or choose the WEBM file to convert.
- The output format is preset to MP4.
- Hit 'Convert to MP4' — it converts inside your browser and downloads right away.
Frequently asked questions
Are my files uploaded to a server?+
No. Conversion happens entirely inside your browser and your file is never sent anywhere — personal videos stay private.
It finished in seconds — did it actually work?+
Yes, that's expected. WEBM and MP4 mostly carry the same video data inside, so conversion is often just repackaging. Quality stays identical.
Are subtitles and extra audio tracks kept?+
Tracks the MP4 spec supports are kept; exotic subtitle formats inside WEBM may be dropped.
Does converting WebM to MP4 lose quality?+
The video inside a WebM uses VP8 or VP9, which MP4 cannot simply carry, so it is re-encoded to H.264. A high-quality setting is used, so the difference is hard to see in normal viewing — but it takes longer than conversions that only swap the container.
Is there a file size limit?+
No server limits, but processing uses browser memory, so it's optimized for short clips (tens to a few hundred MB). Files over 300MB show a warning.
Is it really free?+
Yes. No sign-up, no payment, no conversion limits and no watermark.
Can I pick a different output format?+
Yes — on the converter you can switch the output between MP4, WebM, MOV, MKV, AVI and GIF.
Guide
Why convert WEBM to MP4?
MP4 is the de-facto standard — it plays on Windows, Mac, iPhone, Android, TVs and in every messenger and website. When a WEBM file won't open, won't upload, or your editor can't read it, converting to MP4 fixes it in most cases.
It's the classic "plays for me, not for them" fix — the conversion you need most when sharing WEBM files across different devices.
Where do WEBM files come from?
WebM is Google's format for web playback. Video saved from a browser, output from screen-recording extensions, and files produced by browser-based recording and meeting tools are typically WebM.
It behaves well inside a browser and poorly outside one. Editing and presentation software — Premiere, PowerPoint, DaVinci Resolve — often refuses WebM input, and smart TVs and older iPhones cannot play it. Converting to MP4 before you edit or share is the safe move.
What happens to quality and size?
When the video data inside your WEBM is compatible with MP4 (most cases), the tool just moves it into the new container without re-encoding — zero quality loss, near-identical size, seconds of work.
Only incompatible files fall back to a high-quality H.264 re-encode, and even then the difference is hard to spot in normal viewing.