Video tools
Convert WebM videos into MP4 files directly in your browser when MP4 recording is supported.
MP4 support check
MP4 recording support will be checked locally when you choose a WebM file.
Your WebM preview will appear here.
MP4 quality
Browser-native MP4
This converter uses MediaRecorder, so MP4 codec support depends on your browser. If MP4 is unavailable, the original WebM is still kept private on your device.
Upload a WebM file, choose the range to convert, select an output width and quality preset, then create an MP4 download.
If your browser does not support MP4 recording, the tool will explain the limitation before processing so you do not waste time.
This browser-native workflow decodes the WebM video, draws it to a canvas, and records that canvas into an MP4 file when MediaRecorder supports MP4 output.
It is a practical local conversion workflow, not a lossless remux. Output quality and size depend on the selected bitrate, width, frame rate, and source motion.
The WebM source is decoded and converted locally on your device. This tool does not upload or store your video.
Conversion runs in real time, so a one minute selected range usually takes about one minute to process.
For publishing, MP4 can be a useful companion format when a platform or editor does not accept WebM.
No. The conversion runs locally in your browser with video, canvas, Web Audio, and MediaRecorder APIs. Your file is not uploaded or stored by this tool.
Browsers do not all expose MP4 recording through MediaRecorder. When MP4 is unavailable, the page shows a support warning instead of pretending the conversion can run.
No. The video is decoded and re-recorded. That makes the tool private and dependency-free, but the selected bitrate and size affect the final quality.
MP4 compatibility depends on the codec your browser writes. The tool prefers H.264/AAC style MIME types when the browser reports support.
Last updated: May 14, 2026
