SSAX Image ConverterFree tool
FREE WEBM TO MP4 CONVERTER

Convert WebM to MP4.
Share video more widely.

Turn a WebM video into an MP4 file with browser-based encoding. Select your video and convert it on your device without uploading it.

Drop a WebM video here

or choose a WebM file from your device

WEBM INPUT · LOCAL VIDEO ENCODING

The FFmpeg WebAssembly engine (about 31 MB) loads when you start converting. Video encoding uses your device and may take longer than the video's duration. The engine is fetched from a CDN. Each batch is limited to 100 MiB to protect browser memory.

How to convert WebM to MP4

  1. Select or drop a WebM video file.
  2. Click Convert WebM to MP4 to re-encode it in the browser.
  3. Download the MP4 result when processing finishes.

WebM to MP4 conversion details

This tool converts the first video and audio streams to H.264 video and AAC audio in an MP4 container. Re-encoding takes time and can change video or audio quality. Very long or high-resolution source videos can require substantial memory and processing power.

WebM to MP4 FAQ

Will conversion make my video smaller?

File size depends on the source, video length, resolution, and encoding. Compare the resulting file before replacing the original.

Is my video uploaded?

No. The selected video is processed in your browser. The conversion engine is downloaded from a CDN.

Do all WebM files work?

Some files can contain codecs or streams that this browser-based media engine cannot decode. Unsupported or damaged files may fail.

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