WebM to MP4 converter
Use this free tool to turn a WebM file into an MP4 file. Pick the file, press Convert, and download the MP4.
The work happens in your browser. The file never leaves your device. There is no upload, no watermark and no account.
Or drop a video file here.
How to use it
- Choose a WebM file, or drop it on the box.
- Press Convert. Wait until the bar reaches 100%.
- Look at the preview. Then press Download.
Why change WebM to MP4
Many phones, TVs and editing programs cannot open a WebM file. An MP4 file plays almost everywhere.
The page encodes the video again as H.264 with AAC sound. The picture stays clean at the default quality.
Screen recordings
A WebM file from a browser recorder can have no length in its header. This page reads such a file without a problem.
The progress bar then has no end point. It moves until the work ends.
Other free tools for files
Make a photo smaller with the Image tools. Merge, split or compress a PDF file with the PDF tools. Both tools are free and run in your browser.
Questions
Why does my WebM file not play on my phone or TV?
Many phones, TVs and editors do not support WebM. An MP4 file with H.264 video and AAC sound plays almost everywhere.
Can I convert a screen recording from a browser?
Yes. A browser recorder writes a WebM file with no length in its header. The page reads it, and the bar moves until the work ends.
Does WebM to MP4 lose quality?
The page encodes the video again, so a small amount of detail can change. At the default setting, the picture stays clean.
Does the page keep the sound?
Yes. The page encodes the sound as AAC at 128 kbit/s. A video with no sound gives an MP4 file with no sound.