Compress video for email
Attachment too big to send? Drop your video in and bring it under the 25 MB email limit — compressed locally, nothing uploaded.
Drop a video here, or browse
MP4 · MOV · WebM — compressed right here, nothing uploaded
100% on-device · no signup · no watermark
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Bigger files take longer — your CPU does the work, privately.
Email attachment limits
Gmail allows attachments up to 25 MB; Outlook.com is around 20 MB and many corporate mail servers cap at 10–25 MB. If your file is larger, the email bounces or Gmail switches it to a Google Drive link.
Compressing to 25 MB (or 20 MB to be safe for Outlook) lets you attach the video directly, so the recipient gets it inline without a cloud link.
When the video still won’t fit
Long videos may not reach watchable quality at 25 MB — in that case trim to the essential part, or send a share link. For most short clips and screen recordings, the 25 MB preset produces a clean, attachable file.
How long a video fits in 25 MB — and at what quality
25 MB × 8 × 1,048,576 bits × 0.96 ÷ 30 s = 6,710 kbps in total; − 128 kbps of AAC audio = 6,582 kbps of video. Same constants on every row, taken from the compressor’s code (0.96 = 4% left for the MP4 container).
| Clip length | Total bitrate (kbps) | Video bitrate (kbps) | Max short side |
|---|---|---|---|
| 30 s | 6,710 | 6,582 | No cap (source kept) |
| 1 min | 3,355 | 3,227 | 1080 px |
| 2 min | 1,677 | 1,549 | 720 px |
| 4 min | 838 | 710 | 480 px |
| 5 min | 671 | 543 | 480 px |
| 10 min | 335 | 207 | 480 px |
| 15 min | 223 | 111* | 480 px |
At 25 MB the source frame is kept up to 39 s, 1080 px up to 1 min 16 s, 720 px up to 2 min 58 s, then 480 px (video below 5,000 / 2,500 / 1,000 kbps); the plan stays 4% under 25 MB for clips up to 13 min 6 s.
- * 25 MB · 15 min: 128 kbps of audio would take over half the budget, so video still gets half (111 kbps); the planned file is 25.7 MB — over the limit.
Official limits
Gmail
- Personal account, sending
- 25 MB
- Attachments over the limit
- replaced by a Google Drive link
Source: Gmail Help — “Send attachments with your Gmail message” — checked 26 September 2026
Outlook
- Classic Outlook 2013 and later, POP3 / IMAP / HTTP account (default)
- 20 MB (20,480 KB)
- Exchange mailbox (default)
- 10 MB (10,240 KB)
Source: Microsoft Learn — “Attachment size exceeds the allowable limit error” (KB 2813269) — checked 26 September 2026
Frequently asked questions
How big an attachment can I email?
Gmail and Yahoo allow up to 25 MB; Outlook.com around 20 MB. Corporate servers are often stricter (10–25 MB). Compress to 20–25 MB to be safe across providers.
What happens if my video is too big for email?
The message bounces, or Gmail uploads it to Google Drive and sends a link instead. To attach the file directly, compress it under 25 MB first with the preset above.
Can I keep it under a stricter 10 MB limit?
Yes — switch to the “Discord 10 MB” preset or set a custom target. The compressor lets you pick any target size with the slider.
Is my file uploaded to your servers?
No. Compression is done entirely in your browser; the video never leaves your device.