Compress a video to share on Slack. Free, no upload, no signup. SammaPix shrinks your MP4 to fit Slack's upload limit, right in your browser.
Slack caps uploads, and a raw screen recording or phone clip can blow past it. Compress to a smaller MP4 so it shares in any channel or DM.
Drop a video or click to browse
MP4, MOV, WebM, MKV, AVI — shrink files by up to 80%
100% in your browser — your video never leaves your device · up to 500 MB
Slack's free plan limits uploads, and screen recordings add up fast. Compressing to 1080p or 720p MP4 keeps your clip under the limit so it shares in any channel or DM.
Drop your clip, keep the 1080p downscale on, and pick a balanced or small preset. SammaPix re-encodes it locally and shows the estimated size live so you know it will fit.
No. The compression runs entirely in your browser. Your file is never sent to a server.
Screen recordings compress very well. Try 1080p with the Small preset, or downscale to 720p for the lightest file while staying readable.