How to Convert MP4 to AVI Online
Follow these three simple steps to convert MP4 to AVI. No software installation required. Free and secure.
Select an MP4 Video
Choose the MP4 video that must be delivered to older software, equipment, or another AVI-based workflow.
Choose Video and Audio Settings
Keep the original resolution and frame rate or choose new values, then keep the automatic audio settings or select a sample rate and mono or stereo output.
Convert and Download
Start the conversion, review the original and output file sizes, and download the completed AVI video.
How Does the MP4 to AVI Converter Work?
The CompressFly MP4 to AVI converter decodes the MP4 source, re-encodes the video as MPEG-4 Part 2 and available audio as MP3, and stores the result in an AVI container. Use AVI when the destination explicitly requires it, because MP4 is generally better suited to modern delivery.
Conversion runs directly in your browser. Your MP4 video is not uploaded to a server, and the completed AVI file downloads from the browser to your device.
What "directly in your browser" means
- Your MP4 video is not uploaded to a server.
- Video conversion runs locally on your device.
- The completed AVI video downloads directly from your browser.
When to Convert MP4 to AVI
Convert MP4 to AVI for a specific legacy requirement rather than as a general upgrade to the source video.
Use Older Editing Software
Create an AVI copy when a legacy editor or desktop application does not accept the source MP4.
Meet an Equipment Requirement
Prepare video for older playback, signage, industrial, or presentation equipment that explicitly requests AVI.
Supply a Required Container
Make a separate AVI delivery file while retaining the original MP4 for current devices and web use.
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MP4 to AVI Converter FAQ
How do I convert MP4 to AVI online?
Use this online MP4 to AVI converter in three steps: 1. Select an MP4 video from your device. 2. Keep or change the available video and audio settings. 3. Start the conversion and download the completed AVI video.
What happens when I convert MP4 to AVI?
The MP4 video is re-encoded as MPEG-4 Part 2 with available audio encoded as MP3, then saved inside an AVI container.
Should I convert MP4 to AVI for everyday playback?
Usually only when older software or equipment specifically requires AVI. Keep the original MP4 for modern browsers, phones, sharing, and streaming workflows.
Can I change the video resolution and frame rate?
Yes. Keep the source resolution and frame rate or select an available output resolution and frame rate before conversion.
Will converting MP4 to AVI make the file smaller?
Not necessarily. The output size depends on the source video, selected resolution, frame rate, audio settings, duration, and visual content. Use the Video Compressor when reducing file size is the main goal.
Is the MP4 to AVI converter free?
Yes. Convert MP4 to AVI for free with no registration or credit card required.
Is there a file size limit, and is my video uploaded?
Your video is processed locally in your browser and is not uploaded to a server, so there is no server upload limit. The practical limit depends on your device's available memory and processing power, as well as the video's duration and resolution.