compressvid.ioShrink legacy AVI recordings to an exact size in MB. Output is a compatible MP4 — no watermark, nothing to install.
Quality mode targets CRF and does not guarantee an exact MB size. Switch to target size or bitrate for a hard limit.
Only use this for very old devices or playback issues (reduces compression ratio).
AVI is a 1990s RIFF container. Many camcorders, screen recorders and older exports still write it, often with bulky codecs or almost no compression. A short AVI can outweigh a longer MP4 of the same look, and several phones, web players and mail clients handle it poorly. Compressing AVI to a smaller MP4 fixes size and playback in one step — without hunting down desktop software.
These caps apply to the file you attach — AVI or MP4. Aim a little under the limit so container overhead never pushes you over.
| Destination | Upload limit | Compress to |
|---|---|---|
| Gmail attachment | 25 MB | 24 MB |
| Outlook / work email | Often 20–25 MB | 19 MB to be safe |
| Discord (free) | 20 MB | 19 MB |
| Discord Nitro Basic | 50 MB | 48 MB |
| School & job portals | Usually 10–100 MB | 5% under the stated limit |
| Website media libraries | Often 2–64 MB | Check the host, leave headroom |
Limits checked October 2026. Discord raised its free upload limit from 10 MB to 20 MB in August 2026 — older “8 MB” guides are outdated. Limits checked October 2026. Full breakdown: Discord file size limit.
No VirtualDub, no HandBrake queue — set a size and download a widely compatible MP4.
Drop a camcorder AVI, screen recording or archive clip into the compressor above. MOV, MKV, WebM and MP4 work too.
Type the size you need in MB — 24 for Gmail, 19 for Discord — or pick “50% smaller”. The tool derives a bitrate from the clip’s length so the result lands close to your target.
Output is MP4 (H.264 + AAC by default) — the combination almost every player expects. No watermark, nothing burned into the frame.
File size ≈ bitrate × duration. Use this as a planning table before you compress.
| Video length | Target size | Rough total bitrate |
|---|---|---|
| 15 seconds | 19 MB | ~10 Mbps — sharp 1080p is easy |
| 30 seconds | 19 MB | ~5 Mbps — clean 1080p |
| 60 seconds | 24 MB (Gmail) | ~3.2 Mbps — good 1080p / 720p |
| 2 minutes | 19 MB | ~1.3 Mbps — 720p recommended |
| 5 minutes | 19 MB | ~0.5 Mbps — 480p or cut a highlight |
| 60 seconds | 50% smaller | Half the original — usually looks fine |
If the picture falls apart, lower resolution before starving the bitrate further. Long archival AVIs usually look better as a short highlight than as a five-minute clip forced under 20 MB.
AVI still plays in VLC and some Windows tools, but mobile browsers, email previews and chat apps expect MP4. Re-encoding also drops the dead weight older AVI codecs leave behind.
Discord embeds, Gmail previews, school portals, older Android phones — this is the safest output when a recipient just needs to hit play.
Many AVIs use DivX/XviD or uncompressed audio. Those streams bloat the file and break web players even when the container is fine.
AAC stereo at 64–128 kbps is plenty for clip audio. Odd PCM or multi-channel tracks inflate size and cause silent videos in some apps.
Answers for old AVI files that will not send or play.
Compress AVI to a smaller MP4 at the size you need — free to start, no watermark, nothing to install.