Compress a video for WhatsApp, email or Messenger

A one-minute phone video at 4K is roughly 350–400MB. Gmail's attachment cap is 25MB, WhatsApp compresses videos brutally on its own (and caps document-mode files), and Messenger struggles past 25MB too. To send video anywhere, something has to shrink.

What actually makes video files big

Three multipliers: resolution (4K has 4× the pixels of 1080p), bitrate (how much data each second is allowed), and length. Compression attacks the first two; you control the third.

The practical recipe

1. Trim first. Nobody needs the fumbling before the moment. Trim Video cuts the clip to the seconds that matter — halving length halves the size before any quality is touched.
2. Compress. Compress Video re-encodes at a lower bitrate and, if you choose, a lower resolution. For phone-to-phone sharing, 720p is genuinely fine — on a 6-inch screen you will not see the difference from 4K.
3. Send as a document in WhatsApp (attach → Document instead of Gallery) if you want to avoid WhatsApp's own aggressive recompression of the now-reasonable file.

A 400MB 4K minute typically lands around 15–30MB at 720p with a sensible bitrate — small enough for email, and it looks far better than what WhatsApp's automatic gallery compression would have produced.

When a GIF is the better answer

For a 3–10 second reaction clip destined for a chat or a README, convert it to a GIF with Video to GIF — it autoplays everywhere, needs no player, and no one taps play.

A note on quality

Compression is one-way: keep your original. Compress a copy for sending, and if the result looks blocky in fast motion scenes, re-run with a higher bitrate rather than compressing the already-compressed file again — every generation loses more.