AVI to MP4 Converter
Convert AVI videos to MP4 for universal playback. Transform legacy video files to work on any modern device or platform.
AVI vs MP4: Technical Overview
Why Convert AVI to MP4?
Old AVI files, from digital cameras, camcorders, webcams, video downloads and early screen recorders, frequently won't play on iPhones, Android phones, Macs, smart TVs or in browsers, and they can't be uploaded to most social platforms. Converting them to MP4 brings old videos back into use and preserves them in a format that will be supported for many years.
H.264 is also far more efficient than the MPEG-4 Part 2 codecs (DivX/Xvid) and MJPEG found in most AVIs, so converting an archive of home videos to MP4 often saves a lot of disk space. In our tests an MPEG-4 AVI shrank from 5.7 MB to 2.2 MB with no visible change.
What Changes During AVI to MP4 Conversion
AVI vs MP4: Key Differences
| Feature | AVI | MP4 |
|---|---|---|
| Typical video codec | DivX, Xvid, MJPEG, uncompressed | H.264 |
| Audio codec | MP3 or PCM | AAC |
| Plays on phones, Macs, TVs, browsers | Often not | Yes |
| Efficiency | Low (older codecs) | High |
| Streaming and web | Poor | Excellent |
| Accepted by social platforms | Rarely | Universally |
When to Convert AVI to MP4
Playing old digital camera and camcorder videos on phones and TVs
Preserving family home videos in a modern format
Uploading old AVI clips to YouTube, Facebook or Google Photos
Saving disk space in an archive of DivX/Xvid or MJPEG videos
Editing old AVI footage in modern editors
Sharing legacy screen recordings and tutorials
How to Convert AVI to MP4
- Click 'Select File' and choose your AVI video
- Our system prepares the video
- Click 'Convert to MP4' button
- Wait for the conversion to complete
- Download your MP4 video
Processing typically takes a few seconds. For larger files, conversion may take slightly longer. All conversions are free with no daily limits.
Tips for Best AVI to MP4 Results
- 1.Keep the original AVIs until you've checked the MP4s play correctly.
- 2.Old camera videos can be very large; the upload limit is 500 MB per file.
- 3.If an AVI won't convert, it may be damaged; try playing it in VLC first.
- 4.Converting doesn't improve resolution. Old 640 × 480 videos stay 640 × 480.
Benefits of Converting AVI to MP4
- Universal video compatibility
- Works on all modern devices
- Smaller file sizes than AVI
- Fast and easy conversion
- No signup required
AVI to MP4 — Frequently Asked Questions
Why won't my AVI files play on my phone or Mac?
They often use older codecs like DivX, Xvid or MJPEG that modern devices don't support. H.264 MP4 plays everywhere.
Will the MP4 be smaller?
Usually, yes. H.264 is much more efficient than the codecs in most AVIs; camera MJPEG files shrink the most.
Is quality lost?
It's re-encoded at a high-quality setting with the same resolution and frame rate, so it looks the same.
Does it work with DivX and Xvid files?
Yes. Those are among the most common AVI codecs and convert without problems.
Can I upload the MP4 to YouTube?
Yes. H.264 MP4 is YouTube's recommended format.
Quality & Security
Secure Conversion
Files are encrypted during transfer and automatically deleted within 60 minutes.
Fast Processing
Optimized servers process your AVI to MP4 conversion in seconds.
High Quality
Advanced algorithms maintain the highest possible output quality.
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