Convert AVI to MP4
Free, instant, and secure online converter. Upload your .avi file and receive a crisp .mp4 result in seconds.
Need the opposite conversion? Convert MP4 to AVI →
How to convert AVI to MP4
Upload Your File
Click the upload zone or drag and drop your .avi file anywhere on the area.
Start Converting
Hit Convert and our server will process your file instantly with high fidelity preservation.
Download Result
Your .mp4 file is ready in seconds! Click download. Files auto-delete in 6 hours.
AVI vs MP4: Comparison
| Attribute | AVI (.AVI) | MP4 (.MP4) |
|---|---|---|
| Category | video | video |
| MIME Type | video/x-msvideo | video/mp4 |
| Description | AVI is a classic Windows video container format known for high compatibility with older software. | MP4 is the most universally supported video container, ideal for streaming and sharing across all devices. |
AVI to MP4: What You Should Know
AVI is an older Windows container format with less efficient compression than modern alternatives, meaning larger files for the same visual quality, and spotty codec support on phones, tablets, and current software. Converting to MP4 usually shrinks the file while making it playable on virtually any modern device.
- Expect a meaningful file-size reduction, since AVI files are often encoded with older, less efficient codecs.
- MP4 is the safer choice for uploading to social media, messaging apps, or any modern video platform — most no longer accept AVI directly.
- Very old AVI files with unusual codecs may need a full re-encode rather than a quick remux, so conversion can take longer than for other formats.
About These Formats
About AVI files
AVI is a classic Windows video container format known for high compatibility with older software.
About MP4 files
MP4 is the most universally supported video container, ideal for streaming and sharing across all devices.
Frequently Asked Questions
How do I convert AVI to MP4?
Upload your .avi file using the box above, or drag and drop it in. We'll automatically convert it to .mp4 format — just click download when it's ready.
Is it free to convert AVI to MP4?
Yes. Converting AVI to MP4 is completely free, with no watermarks, no signup, and no limit on how many files you convert.
Is it safe to convert files here?
Yes. Files are processed securely and automatically deleted from our servers a few hours after conversion. We never share or view the contents of your files.
What is a avi file?
AVI is a classic Windows video container format known for high compatibility with older software.
What is a mp4 file?
MP4 is the most universally supported video container, ideal for streaming and sharing across all devices.