Compress MOV Under 25MB
Convert a .mov to an MP4 that plays almost everywhere and fits under 25 MB, or 18 MB if it is going into Gmail.
Target: 25.00 MB
What this page is for
iPhones and many cameras record .mov files that are large and sometimes will not play on Windows. This page converts the MOV to an H.264 MP4, which plays on nearly every phone, PC and upload system, and sizes it to the cap you pick.
It is for sending a clip by email or through a form that refuses anything over 25 MB.
The rule: 25 MB is the stated limit, not the real one
Gmail allows up to 25 MB of attachments per message. Email encodes attachments as text, which adds about a third, so in practice a file much over 18 MB is usually turned into a Google Drive link. Pick 18 MB if it is going into a Gmail message.
Microsoft states a 20 MB message limit for Outlook.com and a 10 MB default for work Exchange accounts, which administrators can change.
Worked example
30 second 4K HEVC MOV from an iPhone, 170 MB. At 25 MB the budget is about 6.2 Mbps, enough for 1080p.
Result: an H.264 MP4 near 23 MB. At the 18 MB setting it comes out near 16.7 MB, still 1080p.
How to use it
- Choose the cap: 18 MB for Gmail, 20 MB for Outlook.com, 25 MB for upload forms.
- Tap Choose file and select the .mov.
- Optional: keep only the first part with the seconds box.
- Tap Convert and compress.
- Download the .mp4 and attach it.
Questions
Will the MP4 play on Windows?
Yes. The output is H.264 video with AAC audio in an MP4, which Windows, Android, macOS and iOS all play without extra software.
My MOV will not open on this page. Why?
Recent iPhones record HEVC. Safari decodes it, and so does Chrome on most Macs and recent Windows PCs. On a PC without HEVC support the browser cannot read the frames; try Safari on the iPhone itself or a Mac.
Why 18 MB for Gmail?
Gmail counts the encoded size of the message, which is about a third larger than the file. 18 MB of video becomes about 24 MB once encoded.
Is the sound kept?
Yes. Audio is re-encoded to AAC at 96 kbps, or copied as-is on browsers that cannot encode AAC.
Is my video uploaded?
No. The conversion runs in your browser.
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.