Free browser tool
Compress a video in your browser
Create a WebM copy with a smaller frame and lower bitrate, then compare the actual files before you download.
Your preview and measured result will appear here.
Already-compressed files can become larger. This tool reports the actual outcome.
How the compression works
The tool keeps the full duration, limits width without enlarging the source, preserves the aspect ratio, and records at the bitrate and frame rate you choose. The result is a new WebM file. Compare the measured sizes before replacing any original.