Compress MP4 Under 25MB
Fit an MP4 under 25 MB for an upload form, or under 18 MB so it stays an attachment in Gmail.
Target: 25.00 MB
What this page is for
Twenty-five megabytes is the most common attachment limit in email and in school and job upload forms. This page fits a video into it without you guessing at export settings.
If the file is going into Gmail, choose the 18 MB setting, for the reason below.
The rule: 25 MB, measured after encoding
Gmail allows 25 MB of attachments per message, but counts the encoded size, which runs about a third larger than the file. A video much over 18 MB is usually converted into a Drive link.
Outlook.com states 20 MB; work Exchange accounts default to 10 MB. Upload forms that say 25 MB usually mean the file on disk.
Worked example
3 minute screen recording, 1080p, 210 MB. For 25 MB the budget is about 1 Mbps: 96 kbps audio and about 940 kbps video at 540p.
Result: an MP4 near 23 MB. Screen recordings with little motion stay readable at this rate.
How to use it
- Choose 25 MB for forms, 18 MB for Gmail, 20 MB for Outlook.com.
- Tap Choose file.
- Optional: keep only the first part with the seconds box.
- Tap Compress under 25 MB.
- Download and attach.
Questions
Why did Gmail still turn it into a Drive link?
The file was probably over about 18 MB. Choose the 18 MB setting and run it again.
Will text in a screen recording stay readable?
At 720p and above, usually. For long recordings that drop to 540p, keep only the part you need.
Does it work with MOV files?
Yes. Any video your browser can decode works; the output is always MP4.
Is anything uploaded?
No.
Related tools
Sizes and results are estimates produced by your own browser. A file that fits the cap is not a guarantee that the destination will accept it: services change their limits, and some check more than size. On iPhone and iPad, Safari limits memory and codecs, so large files can fail there that work on a computer. Keep your original file.