Convert
Convert WEBM to MP4
Free, in your browser, with no watermark and no signup. Both are video files; this changes how the video is packaged and encoded.
Why you have a WEBM file
WEBM is a web-native format, so it is what you end up with after downloading from a browser-based tool or saving something a website served you. Browsers love it. Video editors, phones, and social upload forms very often do not.
What the conversion actually does
WEBM normally carries VP8 or VP9 video with Opus audio, none of which MP4 conventionally uses, so this is a real re-encode into H.264 and AAC rather than a container swap.
Worth knowing first
Because it is a genuine re-encode, this is the one conversion in the list where a small quality loss is unavoidable. Convert once from the best copy you have rather than converting a file that has already been through the process.
How to convert WEBM to MP4
- 01
Add your WEBM file
Drop it in, or pick it from your device. Free uploads go up to 1 GB per file.
- 02
Choose MP4
Pick the output format from the list. Queue several files of the same type to batch them.
- 03
Download
Watch progress live, then download the result. No watermark, on any plan.
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Frequently asked
How do I convert WEBM to MP4 for free?
Open the GrumpTools File Converter, add your WEBM file, choose MP4 as the output and download the result. It runs in the browser, output is never watermarked, and free uploads go up to 1 GB per file.
Does converting WEBM to MP4 reduce quality?
Because it is a genuine re-encode, this is the one conversion in the list where a small quality loss is unavoidable. Convert once from the best copy you have rather than converting a file that has already been through the process.
Can I convert several WEBM files at once?
Yes. Queue multiple files of the same type and convert them in one batch, then download them individually or all at once.