Free AVI to MP4 Converter Online – Modernize Old AVI Videos
Convert legacy AVI videos to modern, compatible MP4 format online for free. In-browser processing with zero server uploads and high fidelity.
Drop your file here, or browse
Processed 100% locally in your browser — your files are never uploaded to any external server.
filename
Converting Your Media...
Encoding locally via browser WASM & hardware acceleration. Please keep this tab active.
Conversion Successful!
Your converted media is ready for preview and instant download.
⚡ How This AVI to MP4 Converter Works
Transcodes legacy Microsoft Audio Video Interleave (AVI) files encoded in DivX, Xvid, or DV into modern H.264 MP4 videos.
Legacy Codec Decoding
Decodes old DivX, Xvid, and MPEG-4 Part 2 streams inside WebAssembly FFmpeg.
Modern H.264 & AAC Compression
Re-encodes video into high-efficiency H.264 and crisp AAC audio with significantly smaller file sizes.
How to Use Free AVI to MP4 Converter Online – Modernize Old AVI Videos in 4 Easy Steps
Upload your legacy AVI video file.
Click Convert Now to re-encode to standard MP4.
Download your modern, playable MP4 file.
Technical Specifications & Features
Frequently Asked Questions
Why convert AVI to MP4?
AVI is an outdated container that is not supported by modern phones, social media, or web browsers. MP4 gives you smaller files with higher compatibility.