AVI to MP4 Converter
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Supports: AVI
Advanced Options - Our defaults are optimized for the best results. We recommend you keeping the defaults unless you have a specific need.
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Need help?How to Convert AVI to MP4 Online
- Upload Your AVI Files: Click "+ Add Files" to select AVI files from your computer, Google Drive, or Dropbox. Batch upload supported.
- Adjust Settings (Optional): Choose video quality and resolution in Advanced Options. Default settings produce a universally compatible H.264 MP4.
- Convert and Download: Click "Convert" and download your MP4 file.
Why Convert AVI to MP4?
40-60% Smaller File Size
AVI is an older, inefficient container format. Converting to MP4 with H.264 encoding typically reduces file size by 40-60% while maintaining the same visual quality. A 1GB AVI file becomes 400-600MB as MP4.
Universal Playback
AVI has inconsistent support on modern devices — many phones, tablets, smart TVs, and web browsers can't play AVI files natively. MP4 plays on every device, browser, and platform without issues.
Web and Social Media
YouTube, Instagram, TikTok, Twitter/X, and Facebook all accept MP4 but often reject or poorly process AVI uploads. Converting ensures smooth uploading and best quality.
Legacy Video Libraries
If you have old AVI files from the early 2000s (DivX, XviD era), converting to MP4 future-proofs your video collection with modern compression that plays everywhere.
AVI vs MP4
| AVI | MP4 | |
|---|---|---|
| Developed | Microsoft (1992) | ISO/MPEG (2001) |
| Compression | Varies (often DivX/XviD) | H.264/H.265 (modern, efficient) |
| File size | Large | 40-60% smaller at same quality |
| Streaming | Poor | Excellent |
| Device support | Windows, some players | Universal (all devices) |
| Web browser support | None | All browsers |
| Best for | Legacy archives | Everything modern |
Frequently Asked Questions
Does converting AVI to MP4 lose quality?
At default settings, the quality difference is imperceptible. Modern H.264 encoding in MP4 is more efficient than most AVI codecs (DivX, XviD), so you get smaller files at the same visual quality.
Will the audio be preserved?
Yes. Both video and audio tracks are converted. The audio is re-encoded to AAC (the standard MP4 audio codec) which is more efficient than the MP3 or PCM audio typically found in AVI files.
Can I convert multiple AVI files at once?
Yes. Upload multiple files and convert them all with the same settings.
My AVI file uses DivX/XviD codec — will it work?
Yes. XConvert handles all AVI codecs including DivX, XviD, MPEG-4, Motion JPEG, and uncompressed video.
Is it free?
Yes. Completely free with no watermarks, no sign-up required, and no file count limits.
Does it work on mobile?
Yes. Works in any modern browser on all devices — no app installation required.