Step by step
- Open this page in Safari on your iPhone and tap to choose a video from your Photo Library.
- Pick a Goal: choose Smaller file, good quality, or a specific limit like Under 25 MB.
- Optionally lower Resolution to 720p or 480p if the clip is long or shot in 4K.
- Tap Compress video, wait for Safari to finish, and save the new MP4 to your Files or Photos.
At a glance
| Method | Best for | Trade-off |
|---|---|---|
| Browser tool on this page | Quick MP4s for email or chat | No app install; runs in Safari on your iPhone |
| Apple iMovie app | Editing clips before exporting | Requires installing iMovie and manual export steps |
| iPhone Camera settings | Future recordings | Does not shrink videos you already recorded |
Where to find it on your device
- Lower future video size on iPhone: Settings > Camera > Record Video
Related questions
Can I compress a video on iPhone for email?
Yes. Select your iPhone MOV or MP4 video in the tool above, set the Goal to Under 25 MB, and download the smaller MP4 to attach in Mail or Gmail.
Does Safari on iPhone support this without uploading?
Yes. Recent Safari on iPhone supports WebCodecs, so compression happens right on your phone without sending the video to any server.
When should I use iMovie instead?
If you also want to trim, cut, or join multiple clips together, iMovie is handy. For simply shrinking a finished video, the browser tool is faster.
What if a long 4K iPhone video fails to compress?
Long 4K videos use a lot of memory on a phone. Choose a lower Resolution like 1080p or 720p in the tool and try again.
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Open the full compress video →
Updated November 14, 2026.