Compress a video for Outlook
Outlook allows 20 MB per email for Outlook.com, and the limit covers the whole message, not just the file. This aims under 14 MB, which leaves room for the text and for how email encodes files.
Your file never leaves this device. Everything runs in your browser.
How it works
- Pick where it's going: Discord, email, Outlook, WhatsApp, a size of your own, or a quality level.
- Drop your video. The tool works out the resolution and bitrate that fit.
- Download the smaller MP4.
Questions
What's Outlook's attachment limit?
Microsoft gives 20 MB for Outlook.com and other personal email accounts, and the limit covers the whole email: the attachment and the message together. A Microsoft 365 work account sends up to 35 MB by default, which its administrator can change, and Outlook on the web sends a quarter under that. A company's own Exchange server defaults to 10 MB.
Why 14 MB and not 20?
An attachment travels encoded as text, about a third bigger than the file, with a line break every 76 characters on top. 14 MB of video travels as about 19.2 MB, which leaves room under 20 MB for the message itself. On a 10 MB Exchange server, pick My own size and aim for 7 MB, or share the video from OneDrive, which is what Microsoft suggests for bigger files.
Does my video get uploaded?
No. The video is read and re-encoded by your browser, on your device. This page can't send the file anywhere: its security policy only allows it to talk to its own site and to the page-view counter.
Why is the file still bigger than I hoped?
A size target is spread over every second of the video. A long video in a small target would need a bitrate so low the picture falls apart, so the tool lowers the resolution first and tells you when even that isn't enough. Trimming the video is the other way down.
What format do I get?
An MP4 with H.264 video and AAC sound, which every platform and phone plays.
Is there a size limit?
Files up to 2 GB and videos up to 15 minutes. Longer videos are better trimmed first.