MP4 to AVI Converter
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Supports: MP4, M4V
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 MP4 to AVI Online
- Upload Your MP4 Files: Click "+ Add Files" to select MP4 files from your computer, Google Drive, or Dropbox.
- Choose Settings: Select compression method — quality preset (Highest to Lowest), target file size percentage, specific file size in MB, constant/variable bitrate, or CRF quality level. Optionally change video codec, audio codec, or resolution (preset like 1080p/720p, percentage, or custom width×height).
- Convert and Download: Click "Convert" and download your AVI files.
Why Convert MP4 to AVI?
AVI (Audio Video Interleave) is Microsoft's legacy video container from 1992. While MP4 is the modern standard, there are specific situations where AVI is required:
Legacy Video Editing Software
Older versions of video editors (pre-2010 software) may only accept AVI input. Some industrial and scientific video analysis tools also require AVI format.
Older Hardware Players
Some legacy media players, car entertainment systems, and industrial display equipment only support AVI playback.
Uncompressed Video Workflows
AVI can store uncompressed video data, which some professional workflows require for frame-accurate editing without any compression artifacts.
MP4 vs AVI Comparison
| Feature | MP4 (H.264) | AVI |
|---|---|---|
| Compression | Highly efficient | Less efficient (older codecs) |
| File size | Smaller | 2-5x larger at same quality |
| Streaming | ✅ Designed for streaming | ❌ Not designed for streaming |
| Subtitles | ✅ Embedded support | ❌ Limited |
| Browser playback | ✅ All browsers | ❌ No browser support |
| Modern device support | ✅ Universal | ⚠️ Limited to desktop |
Important: File Size Increase
Competitors like onlinevideoconverter.to emphasize that AVI works with "older DVD players, TVs, car media systems, and video editing software." codeitbro.com runs conversion entirely in-browser via WebAssembly/FFmpeg. changemyfile.com specifically mentions "DivX-certified DVD players and older Windows editing software" as the target audience. XConvert offers server-side processing with video/audio codec selection, 6 compression methods, and resolution control.
Important: File Size Increase
Converting MP4 to AVI will significantly increase file size. A 100MB MP4 file may become 200-500MB in AVI format, depending on the codec used. AVI uses older, less efficient compression algorithms.
Frequently Asked Questions
Is it free?
Yes. Completely free with no watermarks, no sign-up required, and no file count limits.
Why is the AVI file so much larger?
AVI uses older codecs (DivX, XviD, or uncompressed) that are far less efficient than H.264. This is expected — it's the tradeoff for legacy compatibility.
Can I convert multiple files at once?
Yes. Upload multiple MP4 files and convert them all with the same settings.
Should I use AVI or MP4?
Use MP4 unless you have a specific device or software that requires AVI. MP4 is smaller, more compatible, and better supported on modern devices.
Does it work on mobile?
Yes. Works in any modern browser on all devices — no app installation required.