Several AVI files at once
Queue a folder of old clips. Each one downloads as its own MP4.
Convert AVI to MP4
Old AVI files often will not open on a phone or in WhatsApp. Drop them here and export an H.264 MP4 with AAC audio that plays almost everywhere. Processing stays on your device.
Drag & drop AVI files here
or click anywhere in this area to choose files
AVI · Max 300 MB per file
Output format
All files export as MP4 (H.264 + AAC) with fast-start for wide compatibility.
Need large files, batch processing, or GPU acceleration? Download Videoradius Desktop for up to 10x faster exports.
Why Convert AVI Instead of Renaming the File?
AVI is a container from older cameras and Windows software. Changing the extension does not make it an MP4.
Phone-ready H.264
The MP4 uses H.264 video, AAC audio, and fast-start so it opens in players that reject AVI.
Privacy-first
Everything runs on your device in the browser—your originals stay private.
What This AVI Converter Accepts
Built for .avi from cameras, screen captures, and older editors.
AVI input
AVI video files up to 300 MB each.
Shorter clips process faster in the browser.
MP4 output
Export as MP4 (H.264 + AAC) with fast-start. Audio is included when the AVI has a soundtrack.
Output replaces the .avi extension with .mp4 (e.g. clip.mp4).
How to Turn an AVI into an MP4
Three steps. The file is re-encoded, not just renamed.
1
Add AVI files
Drag and drop AVI files or click Choose Files. Several files can wait in the queue.
2
Convert
Click Convert to MP4. Each AVI is re-encoded in your browser.
3
Download
Save your MP4 files directly to your device when conversion completes.
More Free Video & Audio Tools
Process files in your browser — free, fast, and private.
AVI to MP4 Questions
What changes when an old AVI becomes an MP4.
Do I need an account to convert AVI to MP4?
No. Add the AVI and click Convert to MP4.
Are my files uploaded to your servers?
No. Processing runs locally in your browser. Your files are processed on your device and are not sent to Videoradius servers.
Will renaming .avi to .mp4 work?
No. AVI and MP4 are different containers. This tool re-encodes the picture to H.264 and the sound to AAC.
Will audio be preserved?
Yes, when the AVI has an audio track it is converted to AAC. Silent AVI files export as video-only MP4.
What is the maximum file size?
Each AVI can be up to 300 MB in this browser tool. Longer files take more time on the device you are using.
What if the AVI is larger than 300 MB?
Use the Videoradius Video Converter desktop app for Windows. It handles larger files, more codecs, and batch conversion with GPU acceleration.
Need Pro Video Tools on Windows?
Videoradius Video Converter supports 300+ formats, GPU acceleration, batch processing, and 100% offline processing.