Convert MP4 Videos to AVI Format Online Convert MP4 video files to AVI format in your browser.

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MP4 to AVI Converter

Convert MP4 video files to AVI format in your browser.

Upload MP4

Drag and drop your MP4 file or click to browse.

Convert to AVI

Click Convert to transform your MP4 into AVI format.

Download AVI File

Download your converted AVI file instantly.

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What Is MP4 to AVI Converter?

The MP4 to AVI Converter transforms MP4 video files into AVI (Audio Video Interleave) format entirely in your browser. AVI is a legacy container format developed by Microsoft, still used by some older video editing software, media players, and embedded systems. This tool decodes the MP4 video using the HTML5 Video element, captures frames via Canvas, and packages the output in an AVI-compatible container. While AVI is an older format, it remains relevant for compatibility with legacy systems and certain professional workflows. All processing is done client-side for privacy.

Why Use MP4 to AVI Converter?

Compatible with legacy video software and players
Client-side conversion — no server uploads
No software installation required
Converts files without registration or daily limits

Common Use Cases

Legacy Software

Convert MP4 videos for use in older video editing or playback software that requires AVI.

Embedded Systems

Prepare videos for devices and systems that only accept AVI format.

Archiving

Store videos in AVI format for compatibility with archival workflows.

DVD Authoring

DVD creation tools often require AVI as an intermediate input format.

Technical Guide

True AVI encoding with specific codecs isn't available natively in browsers, so the tool re-encodes the video using the browser's MediaRecorder API to produce a compatible output. For full AVI container support, it constructs the RIFF-based AVI header structure with the appropriate FourCC codes, frame dimensions, and timing information. The video stream is wrapped in the AVI container format with interleaved audio and video chunks. For optimal AVI output with specific codec requirements, users may want to consider ffmpeg.wasm for more advanced encoding options.

Tips & Best Practices

1
AVI files may be larger than the original MP4 due to less efficient compression
2
For best results with legacy software, keep video resolution standard (720p or below)
3
Consider using ffmpeg.wasm for production-quality AVI encoding
4
Test the output in your target application to verify compatibility

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Frequently Asked Questions

Q Why convert to AVI?

AVI is needed for some legacy video editing software, embedded systems, and older media players that don't support modern formats.

Q Does converting MP4 to AVI increase file size?

AVI files are often larger than MP4 because the AVI container uses less efficient compression methods.

Q Is the conversion private?

Yes. All processing happens in your browser — no files are sent to any server.

Q What codecs are used?

The output uses the browser's available codecs wrapped in a compatible container format.

Q Can I convert large videos?

Yes, but large files take longer. Keep videos under 200MB for best performance.

About This Tool

MP4 to AVI Converter is a free online tool by FreeToolkit.ai. All processing happens directly in your browser — your data never leaves your device. No registration or installation required.