runs locallyno uploadsbrowser-based
compResso.
compress video files locally in your browser.
all processing happens on your device using ffmpeg.wasm. no files are sent anywhere. works offline once loaded.
files
drop videos hereorbrowse
mp4, mov, webm, mkv, avi...
preset
codec
quality
quality (crf)
23high quality
18
23
28
35
42
← better quality / larger filesmaller file / lower quality →
how it works
fully private
your files never leave your machine. ffmpeg.wasm runs entirely in the browser. no server, no cloud, no tracking.
all codecs supported
encode to h.264, h.265/hevc, av1, or vp9. pick the right codec for your use case — compatibility, size, or quality.
preset compression
one-click presets for web, social media, discord, and 4k archiving. or go custom and control every parameter.