Convert AVI to MP4 Online Free
Convert AVI video to MP4 format with high-quality encoding. Powered by FFmpeg for reliable transcoding of any resolution.
ChangeThisFile converts your AVI video to the widely compatible MP4 format using FFmpeg on our secure servers. The video is re-encoded with modern H.264 compression, significantly reducing file size while maintaining quality. Files are automatically deleted post-conversion, completely free with no signup.
Convert AVI to MP4
Drop your AVI file here to convert it instantly
Drag & drop your .avi file here, or click to browse
Convert to MP4 instantly
AVI vs MP4: Format Comparison
Key differences between the two formats
| Feature | AVI | MP4 |
|---|---|---|
| Video codec | Various (DivX, Xvid, uncompressed) | H.264/H.265 |
| Container | AVI (RIFF) | MPEG-4 Part 14 |
| Compression | Depends on codec | Lossy |
| Audio codec | MP3/PCM/AC3 | AAC |
| Streaming | No | Yes (progressive + adaptive) |
| Browser support | None | Universal |
| Max resolution | No limit | 8K |
| Metadata | Basic | Extensive (atoms/boxes) |
When to Convert
Common scenarios where this conversion is useful
Device compatibility
Convert AVI to MP4 for playback on devices or software that does not support AVI natively.
Cross-platform sharing
Share MP4 files with collaborators who use different operating systems or media players.
Video editing preparation
Convert to MP4 as required by your video editing software's import format requirements.
File size optimization
Re-encode AVI as MP4 to potentially reduce file size while maintaining acceptable quality.
How to Convert AVI to MP4
-
1
Upload your AVI file
Drag and drop your .avi file onto the converter, or click to browse. Files up to 50 MB are supported for free.
-
2
Server-side conversion
Your file is securely uploaded and converted on our servers using FFmpeg, the industry-standard multimedia framework. This typically takes a few seconds.
-
3
Download the result
Once conversion is complete, click Download to save your .mp4 file. The uploaded file is automatically deleted from our servers.
Frequently Asked Questions
Yes, completely free. Convert AVI to MP4 with no cost, no signup, and no watermarks.
No. Files are automatically deleted immediately after conversion. Nothing is stored or retained.
Yes. Files are transferred over encrypted HTTPS connections. Your data is protected in transit.
The conversion uses FFmpeg, the industry-standard multimedia framework on our servers, ensuring reliable and high-quality output.
Some quality loss occurs during transcoding between formats. The converter uses high-quality encoding settings to minimize this.
Embedded subtitle tracks may not transfer between all container formats. Hardcoded subtitles (burned into video) are always preserved.
Yes. The audio track is transcoded and included in the output MP4 file.
The converter uses the standard codec for MP4: H.264/H.265.
Yes. The converter handles video of any resolution, including 4K and higher. Processing time increases with resolution.
Conversion time depends on file size and duration. Most files under 50 MB convert in seconds.
Currently, files are converted one at a time. Upload your next file after downloading the result.
Files up to 50 MB are supported for free conversion.
Related Conversions
Ready to convert your file?
Convert AVI to MP4 instantly — free, no signup required.
Start Converting