Compress video to an exact file size on Mac
Hit a file-size limit for email, Discord or WhatsApp. Pick the size, not the quality.
87% smaller
Three steps. That's it.
- 1
Drop your files
Drag files onto Compress to Size, choose them with Choose Files, or right-click them in Finder.
- 2
Choose the options
Set what you need in the options panel, such as target. Your choices are remembered for next time.
- 3
Get the result
The result lands in a new dated folder in Downloads › OneMacTools. Your originals are never changed.
What Compress to Size does
Choose 8 MB for Discord, 16 MB for WhatsApp, 25 MB for email or any size you like. Two-pass encoding fits the video under the limit and lowers the resolution only when that will look better than starving the bitrate. In our tests an 814 MB, 20-second 1080p clip came out at 4.8 MB for a 5 MB limit.
It's also a Finder Quick Action: right-click files and choose OMT: Compress Video to 25 MB.
Uses FFmpeg, which OneMacTools installs for you with one click through Homebrew.
Options
Great for
- Email a video under the 25 MB attachment limit
- Post a clip in Discord under 8 MB
- Share on WhatsApp without it being re-compressed
Questions about Compress to Size
Does Compress to Size upload my files?
No. Compress to Size runs entirely on your Mac, so your files never leave it and it works offline.
Will Compress to Size change my original files?
No. Results are saved as new files in a dated folder in Downloads › OneMacTools, and your originals are left exactly as they were unless you turn on an option that says otherwise.
What does Compress to Size need?
macOS 26 or later and FFmpeg, which OneMacTools can install for you through Homebrew with one click.
Can I use Compress to Size from Finder?
Yes. Right-click files in Finder and choose Quick Actions › “OMT: Compress Video to 25 MB”. It runs in the background and notifies you when it's done.
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Compress to Size, plus 88 more.
One app. One price.
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