Compress video for email
Fit videos under the 25 MB attachment limit of Gmail. Private, local, free.
Gmail and Yahoo Mail accept attachments up to 25 MB in total; Outlook.com allows 20 MB.
Above the limit Gmail turns the attachment into a Google Drive link, which the recipient has to open separately.
What fits in 25 MB
What the compressor picks for a typical 1080p 30 fps phone clip (about 16 Mbit/s) of different lengths when the limit is 25 MB:
| Clip length | Resolution | Video bitrate |
|---|---|---|
| 30 seconds | 1080p | 6,127 kbit/s |
| 1 minute | 720p | 2,994 kbit/s |
| 2 minutes | 540p | 1,460 kbit/s |
| 5 minutes | 360p | 553 kbit/s |
| 10 minutes | 240p | 239 kbit/s |
How it works
- We read your video locally and measure how detailed (SI) and how much in motion (TI) it is.
- From the size you pick we compute an exact bitrate budget, then choose the resolution and frame rate that look best at that budget. Lower resolution with enough bits beats blocky full resolution.
- Your GPU encodes it through WebCodecs. Formats the browser cannot decode go through FFmpeg compiled to WebAssembly.
- If the result is even slightly over the limit, we re-encode with a corrected bitrate, so the file fits.
Questions
What if the video is still too big for one email?
Pick a smaller size, such as 10 MB, or trim the clip first. Long videos need a lower resolution to fit an attachment.
Is my video uploaded?
No. Nibbo runs in your browser and compresses the video on your device. You can switch off Wi-Fi after the page loads and it still works.
Why does my video get a lower resolution?
A small file has a fixed number of bits. Spreading them over fewer pixels gives a clean picture; keeping full resolution would make it blocky.