Compress Video for Slack

Screen size set to 1080p, with a target size computed from your video.

This page opens the compressor with Screen size at 1080p (a video at 1080p or below stays at Original). After you load a video, the After size shows the target for that resolution and frame rate. Click it to type a different size in MB.

Free Video Compressor

No sign-up. No upload. No size limit.

Drop a video here, or click to choose one MP4, MOV, WebM, MKV and more · any size

Nothing is uploaded — the file is compressed on your device.

Target size

Screen size

Frame rate Format Audio

Original—

After ≈MB

Free to compressNo account, no daily quota, no file size limit.

Nothing is uploadedFiles are processed on your device and never reach a server.

No catch on the outputNo watermark and no size cap.

Updated in the openEvery fix and change is written down on the changelog page.

Slack's limits (checked September 2026)

Slack accepts files up to 1 GB each (Slack Help Center). On free workspaces, messages and files from the last 90 days can be viewed, and those more than one year old are deleted (Usage limits for free workspaces).

Screen recordings

Keep 1080p or Original for recordings with code, spreadsheets or small UI text. At 720p and below that text gets softer. Many screen recorders capture at 60 fps. Setting Frame rate to 30 fps under Advanced lowers the target for such a recording from about 6 Mbps to about 4 Mbps at 1080p in MP4 (H.264).

Before downloading, open the Compare tab and view the frame at 1:1 to check that text is still readable. If only two minutes of a long session matter, cut them out with Trim Video ↗ first.

Only the first audio track is kept. A recording with system sound and microphone on separate tracks keeps just the first one.

Work content stays on your device

The file is read and compressed in your browser, and no part of it is sent to this site. A recording that shows internal dashboards or customer data goes only to Slack when you post it. The original file is not changed. If the tab closes before you download, the last result stays in the browser for up to 7 days.

Frequently asked questions

What is Slack's file size limit?

1 GB per file (checked September 2026).

Which format should I pick for Slack?

MP4 (H.264) is the default and opens in the most players and apps. HEVC and AV1 files are smaller at the same setting, but some devices cannot play them. The Format menu lists only what your browser can encode on this device.

Is my recording uploaded to this site?

No. Compression happens on your device.

Can I compress a recording that is several GB?

Yes. The output is written to disk as it is produced, so memory use stays flat. A progress window shows elapsed and remaining time, and the screen is kept awake while it runs.