How to use the Compress WEBM
- Choose the WEBM.
- Choose a level or target size.
- Compress.
- Download the MP4.
Why MP4?
Encoding VP9 WebM in a browser is very slow. H.264 MP4 compresses many times faster, gives similar size savings, and plays in more apps, including PowerPoint, iMovie and older iPhones. If you need WebM for a web page, use MP4 to WEBM afterwards.
Good to know
Compression uses H.264 (x264, "veryfast" preset) with either a quality target (CRF) or a calculated bitrate for target sizes. Audio is re-encoded to AAC. The file is never uploaded, so even private videos can be compressed safely.
Supported files
MP4, MOV, MKV, WEBM, AVI, WMV, FLV, M4V, 3GP, 3G2, MPEG, MPG, TS, MTS, M2TS, VOB, OGV, MXF, ASF, DIVX, F4V, SWF, DV, MOD, TOD, WTV, RM and RMVB video, with H.264, HEVC, VP8, VP9, MPEG-4, MPEG-2, WMV, Theora and other codecs. AV1 videos cannot be read in the browser yet. Files up to 1 GB each.
Frequently asked questions
Will text in screen recordings stay readable?
Yes at "Light" or "Recommended". Avoid very small target sizes for recordings with small text.
Is the Compress WEBM free?
Yes, completely free, with no sign-up and no watermark. Files up to 1 GB each can be converted, and there is no daily limit.
Are my files safe?
Yes. Files are converted locally in your browser and are never uploaded. When you close the page, nothing is left behind.
Does it work on iPhone and Android?
Yes, in Safari, Chrome and other modern mobile browsers. Short files work best on phones; for long or high-resolution videos a computer is faster.