Free · No signup · No watermark

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

🔒 Your video never leaves your device. No upload, no signup, no watermark.

Share it on Slack in 3 steps

1

Drop your recording in

Drag and drop your screen recording into the tool above. It never leaves your browser — no upload, no waiting on a server.

2

Compress to 50 MB

The 50 MB preset is pre-selected. A 50 MB encode looks identical in a channel thread and uploads in seconds instead of minutes.

3

Drop it in the channel

Download the file and share it in Slack — no more 'file too large' friction for your team.

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.