Why 15 MB and not 25 MB?
Email can only carry text, so attachments are converted with Base64 encoding before they’re sent. That makes every attachment about a third larger. A 25 MB message limit therefore fits a file of roughly 18 MB, and a 20 MB limit fits about 14–15 MB.
Gmail and Yahoo allow 25 MB per message, and Outlook.com allows 20 MB. Company mail servers are often stricter. Aiming for 15 MB leaves room for the encoding overhead, your signature and the rest of the message.
Choosing the right size for the recipient
If you know the recipient uses Gmail and you’re sending a single file, you can raise the target to 18 MB for a little more quality. If the email is going to a corporate address, or you’re attaching other files too, go lower, to 10 MB.
For anything longer than a few minutes, a shared link from a cloud drive will look better than a heavily compressed attachment. Compression is best for short clips: a product demo, a bug reproduction, a moment from a family video.
Will it play on the recipient’s device?
The output is an MP4 with H.264 video and AAC audio. That combination plays in the built-in player on Windows, macOS, iPhone and Android, and in every modern browser, so the recipient doesn’t need to install anything.
Private by design
ClipFit processes your video inside your browser using FFmpeg compiled to WebAssembly. The file is never uploaded, so there’s no waiting for transfers and no copy left on a server. Once you close the tab, nothing remains.
Questions
Gmail turned my attachment into a Drive link. Why?
Gmail does that when attachments add up to more than 25 MB after encoding. Compress the video to 15–18 MB and it will attach normally.
Does this work for Outlook?
Yes. Outlook.com’s limit is 20 MB per message, which the 15 MB preset fits after encoding. Some workplace Exchange servers use lower limits; if your email bounces, try 10 MB.
Will the person I send it to see a lower-quality video?
Some detail is lost when you compress, especially in long or fast-moving videos. For clips under a minute or two, the difference is usually hard to notice on a phone or laptop screen.