This tool can be used to convert WebM videos of dynamic resolution to MP4 files of a fixed 1280x720 resolution.

Just select a video file and wait. It takes about 60-seconds to transcode 1-second of video. Very sloowww...

You can use FFMpeg locally to achieve much faster results.

This tool performs the following action in your browser: fmpeg -i input.webm -vf scale=1280:720 output.mp4

---

Bonus: This option converts MKV files to MP4 files without transcoding.

fmpeg -i INPUTFILE -vcodec copy -acodec copy output.mp4

You can use FFMpeg locally to achieve much faster results with either option.

This option converts WebM files to MP4 files without transcoding, and attempting to force high resolutions.