ConvertWarp

Compress video

The picture is re-encoded down to a 720 px box. If the file does not get smaller, the original is kept.

Video tools use FFmpeg (GPL-2.0-or-later).

About this tool

Compress video re-encodes a MOV or MP4 into a 720 px box with a fast H.264 preset so chat apps stop rejecting the file. If the result is not smaller, the original is kept — same honesty as Compress PDF.

This will look softer than the camera original. It is not a two-pass film encode. 50 MB in, ffmpeg.wasm in the tab, slow on phones.

ffmpeg scales to fit 720×720 and encodes libx264 veryfast with a CRF aimed at smaller files. Audio is transcoded as needed. If bytes do not drop, you get the source back.

How to compress a video

  1. Choose a MOV or MP4 that chat apps reject for size.
  2. Compress. Wait for ffmpeg; the tab may hitch.
  3. Download only if the file actually shrank.

50 MB. 720 px box. Kept-as-original when shrink fails. Not HDR-aware mastering.

FAQ

Does compression upload the clip?
No. Re-encode is local.
Why keep the original?
A “success” that is larger or uglier without a size win is worse. The kept flag tells you packing lost.
Can I pick 1080p?
Not in v1. The 720 box is what a tab can usually finish.
Audio bitrate?
You do not get a mixer. The goal is a smaller MP4 that still plays.
Need only a shorter clip?
Trim video first. Fewer seconds shrink more than CRF alone.

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