Compress video for Slack
Nobody wants to download a 400 MB screen recording in-channel. Shrink your video to an exact size first — fast uploads, happy teammates.
Drop your video here
or
MP4, MOV, WebM… — processed 100% on your device
Target size
Planned output:
ð¦ Large file: encoding several hundred MB in your browser can take a very long time, and phones may run out of memory. Desktop Chrome recommended.
Loading encoder…
🔒 Your video never leaves your device. No upload, no signup, no watermark.
Why compress before sharing in Slack?
Slack swallows large files, but a heavy video stalls the upload, previews sluggishly, and sits in your workspace storage forever. A 50 MB encode of a screen recording looks identical in a channel thread — and uploads in seconds instead of minutes.
Recording a demo or bug report? Compress it here first, then drop the file straight into the channel. Your teammates on slow connections will thank you.
Need a different target? Compress to 20 MB · Compress to 100 MB · Compress for Telegram
FAQ
How do I compress a video for Slack?
Drop your video above, keep the 50 MB target (or type any size), and hit Compress. VidSizer solves the exact bitrate for your clip and verifies the output lands under your target.
Does Slack recompress uploaded videos?
Slack generates previews but keeps your uploaded file as-is, so the quality you encode is the quality your team downloads. That's exactly why compressing first — with full control — beats letting a chat app decide for you.
Is my video uploaded anywhere?
No. Everything runs in your browser. No upload, no account, no watermark.