Got "file too large"? The quickest fix that keeps it watchable: drop the resolution to 720p and re-encode to H.264 MP4. A 1080p or 4K phone clip usually shrinks 3–5× from that one change, and on a phone screen you won't notice.

Below are the common size limits and what actually moves the needle.

The limits you're probably hitting

  • Gmail / most email: 25 MB per attachment.
  • Slack (free): fine for small clips, but big uploads eat your workspace storage.
  • WhatsApp: ~16 MB for video.
  • Discord (free): 25 MB.

So the target is usually "get it under 25 MB" — sometimes under 16.

What actually shrinks a video

In order of impact:

  1. Resolution. 4K → 1080p is roughly a 4× cut; 1080p → 720p another ~2×. This is the biggest lever and the one people forget.
  2. Bitrate / quality. After resolution, lowering the target bitrate trims the rest. Past a point you get blocky motion, so don't overdo it.
  3. Length / trimming. If only 20 seconds matter, cut the rest. Half the length, half the size.
  4. Codec. H.264 is universally playable; H.265/HEVC is smaller but not every app plays it. For sharing, stick with H.264 unless you know the recipient supports HEVC.

Frame rate matters less than people think — going 60→30 fps helps a bit, but resolution and trimming do far more.

Do it in the browser

  1. Open the Video Compression tool and drop your clip in.
  2. Set the target resolution to 720p (or 1080p if you need it sharper).
  3. If there's dead air at the start/end, trim it.
  4. Check the estimated output size — if it's still over the limit, nudge quality down a notch.

A real case: a 90-second 4K screen recording at 180 MB came down to about 18 MB at 720p, still perfectly clear for a how-to clip.

When NOT to compress harder

  • The video has fine text or UI (tutorials, code) — going below 720p makes text mushy. Keep resolution, trim length instead.
  • You'll edit it later — compressing then editing then re-compressing stacks quality loss. Keep a master copy.
  • It's already small — re-encoding a 5 MB clip can make it look worse for little gain.

Everything runs locally in your browser, so the raw video never gets uploaded to a third-party server — handy for anything personal or work-confidential.

Need it smaller now? Drop your clip into the Video Compression tool and aim for under 25 MB.