Convert AVI to MP4
Give old DivX and Xvid AVI videos a second life as MP4 that plays on phones and TVs.
Files are processed on our server in Europe. Download links expire after 60 minutes; files are then deleted automatically.
Why use Video Compressor
Private and secure
Your video is sent over an encrypted connection to our server in Europe and stored under a random ID. It is never shared with third parties or used to train AI. Download links expire after 60 minutes; files are then deleted automatically, normally within 75 minutes. Read the privacy policy
Honest results
Choose quality and resolution. Progress comes from the encoder itself, and the result shows the exact size of your MP4 next to the original.
Free, no sign-up
Video Compressor is free with no account, no watermark and no ads. It works in any modern browser on phone or desktop.
In short
AVI to MP4 converts AVI files, typically DivX, Xvid or Microsoft MPEG-4 video, into MP4 with H.264 video and AAC audio. The result plays on iPhone, Android, smart TVs and in every browser, and is usually much smaller. Files up to 1 GB and 30 minutes are supported.
| Accepted formats | MP4, MOV, M4V, 3GP, WebM, MKV, AVI, WMV, FLV, MPEG, MTS/TS, OGV |
|---|---|
| Maximum file size | 1.00 GB |
| Output | MP4 (H.264 video, AAC audio), max 1080p, never upscaled |
| Video limits | Up to 30 minutes, up to 4K input |
| Target size | Not on converter pages; the video compressor sets target sizes |
| Units | 1 KB = 1,000 bytes; 1 MB = 1,000,000 bytes |
| Where files are processed | On our server in Europe; not sent to third parties |
| Retention | Download link expires after 60 minutes; files deleted automatically, normally within 75 minutes |
| Price | Free, no account, no watermark |
| Typical sources | DivX and Xvid movies, old Windows recordings, early digital cameras and capture cards |
| Codecs read | MPEG-4 Part 2 (DivX, Xvid), Microsoft MPEG-4 v2/v3, H.264; MP3, AC-3 and PCM audio |
How to use it
- Choose or drop your AVI file (up to 1 GB, 30 minutes), or import it from a link.
- Keep the High quality preset, or pick a lower resolution if you also want a smaller file.
- Select Convert to MP4 and keep the tab open while it uploads and converts.
- Preview the MP4 and download it.
Why convert AVI to MP4?
AVI dates from 1992 and was the standard for DivX and Xvid video in the 2000s. Phones, browsers and most TVs no longer play it, and the codecs inside need several times the bitrate of H.264 for the same picture. Converting gives you a modern, compatible file that is usually much smaller.
AVI files that can't be converted
Some AVI files from old digital cameras use Motion JPEG, and some screen-capture tools use proprietary codecs. Those are reported as unsupported rather than converted badly.
Questions
Is AVI to MP4 conversion lossless?
No. The video is re-encoded to H.264, which is lossy, but converter pages start at the High quality preset, where the difference is hard to see at normal viewing size. The picture is never upscaled, and the shorter side is capped at 1080 pixels.
Why is my MP4 so much smaller than the AVI?
H.264 is far more efficient than DivX/Xvid or uncompressed AVI video, so the same picture needs much less data. Nothing is cut; the duration is checked after conversion.
What happens to my file after conversion?
It's stored under a random ID on our server in Europe. The download link expires after 60 minutes and the file is then deleted automatically, normally within 75 minutes. Canceling deletes it immediately.
Convert other formats to MP4
Related tools
- WMV to MP4Make Windows Media videos play on Mac, iPhone, Android and the web.
- MPEG to MP4Modernise MPEG-1 and MPEG-2 videos from VCDs, DVD recorders and TV capture.
- MKV to MP4Turn Matroska MKV recordings into MP4 for phones, TVs, editors and upload sites.
- Video compressorMake any video smaller, with a target size.
Last reviewed October 31, 2026.