Free · No signup · Runs in browser

Free AVI to MP4 Converter

Convert old AVI videos to modern MP4 format — plays everywhere, no upload needed.

Why use MorphFlux?

AVI to MP4 conversion runs entirely in your browser — modernize legacy video files with no server upload.

Modernizes legacy video files

Converting AVI to MP4 gives your old video files new life with a format supported by every modern device and platform.

Runs locally in your browser

Your AVI files are processed entirely on your device using FFmpeg WebAssembly. Nothing is uploaded to any server.

Better compression than AVI

MP4 typically produces smaller file sizes than AVI while maintaining comparable or better visual quality.

Free with no signup required

Convert as many AVI files to MP4 as you need, completely free. No account, no email, no credit card required.

When would you need this?

Common scenarios where converting AVI to MP4 updates legacy video files for modern use.

Converting old AVI home video recordings to MP4 for sharing on modern devices and platforms

Transforming AVI filefrom legacy software to MP4 for uploading to YouTube or social media

Converting AVI video archives to MP4 for better compression and modern device compatibility

About AVI and MP4

Understanding the difference between legacy AVI and modern MP4 video formats.

AVI

What is AVI?

AVI (Audio Video Interleave) is a legacy video format developed by Microsoft in 1992. While widely used in older recordings and software, AVI filee often large and not optimally supported by modern devices and platforms.

MP4

What is MP4?

MP4 (MPEG-4 Part 14) is the modern standard for video, offering better compression and universal compatibility. Converting AVI to MP4 modernizes your video files for use on any device or platform.

Frequently Asked Questions

Everything you need to know about converting AVI to MP4 online.

How do I convert AVI to MP4?

Drop your AVI file into the converter above or click to select it. The conversion happens in your browser and you can download the MP4 when ready.

Will the video quality change?

The conversion re-encodes the video, which may slightly reduce quality. We use high quality settings to minimize any visible difference.

Is my file uploaded to a server?

No. All conversion happens locally in your browser using FFmpeg WebAssembly. Your files never leave your device.

Is there a file size limit?

Files up to 200MB are supported. Since conversion happens in your browser, very large files may require significant memory.

Why is AVI considered a legacy format?

AVI was developed in 1992 and lacks modern features like efficient compression, streaming support, and metadata handling that MP4 provides.

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