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MP4 to AVI Converter Online

Convert MP4 to AVI online in your browser with no installation, no signup, and clear privacy protection. Upload a video, pick AVI as output, and download a compatible file for TV, DVD players, or editing software in just a few clicks.

For more powerful MP4 to AVI conversion needs, UniConverter Desktop gives you much more:

  • Convert MP4 to AVI in batch and save time on large files
  • Enjoy up to 130× faster conversion speed
  • Support for 1,000+ audio/video/image formats
  • An all-in-one toolkit including editing, enhancement, and more
Batch Convert MP4 to AVI
Batch Convert MP4 to AVI
Batch Convert MP4 to AVI

How to Convert MP4 to AVI Online in a Few Clicks

upload mkv format file
Step 1

Upload your MP4 video from any device

Click the upload area and select your MP4 file from computer, phone, or cloud storage. Our online converter works in major browsers, and your video is transferred over an encrypted connection to keep personal recordings and work clips protected during processing.

choose mp4 as output format
Step 2

Choose AVI as the output video format

Open the format list, select AVI as your target format, and confirm basic options such as resolution or quality level when available. The online tool focuses on a simple setup so you do not need to understand codecs, bitrates, or other complex technical parameters.

download converted mp4 video
Step 3

Start conversion and download the AVI file

Hit the Convert button and wait while our servers turn your MP4 into an AVI file. When the process finishes, download the converted video and test it on your TV, old DVD player, car system, or editing program to confirm smooth playback and synced audio.

What Are MP4 and AVI, and Why Convert Between Them?

MP4
AVI
File Extension .mp4 .avi
Full Name MPEG-4 Part 14 Audio Video Interleave
Description MP4 is a modern digital multimedia container format widely used for online streaming, mobile playback, and sharing. It efficiently stores video, audio, subtitles, and metadata with strong compression while keeping good visual quality across many platforms. AVI is an older multimedia container format developed by Microsoft. It is still preferred by many legacy TVs, DVD players, and editing programs, often favoring compatibility and simple decoding over maximum compression or very small file sizes.
Associated Programs VLC media player, Windows Media Player, QuickTime Player, iTunes, Android video player, web browsers VLC media player, Windows Media Player, VirtualDub, many DVD player firmware, classic editing tools
Initial Release 2001 1992
Developer Moving Picture Experts Group (MPEG) / ISO Microsoft
Common Use Cases Streaming video, smartphone recordings, social media clips, online courses, video downloads, cross-platform sharing Playback on older TVs and DVD players, basic video editing, compatibility with legacy Windows software and some hardware devices
MIME Type video/mp4 video/x-msvideo

Key Features of Our MP4 to AVI Converter

Secure online MP4 to AVI conversion in your browser

Use the web-based converter to change a single MP4 file to AVI over encrypted connections, without installing software. Files are processed only for the duration needed to convert and download, helping protect personal or confidential videos during online handling.

Simple three-step MP4 to AVI online with no install

Upload your MP4, choose AVI, and click to convert. The online tool is designed for quick, one-off tasks, perfect when you just need a compatible file for a TV or player. No registration, plugins, or heavy configuration panels are required to get a working result.

High-quality conversion with clear picture and audio

Whether you use the online tool or desktop app, the converter aims to keep original resolution and audio tracks where possible. Smart defaults help reduce artifacts, avoid silent videos, and deliver an AVI file that looks sharp and stays in sync during playback.

Device-friendly AVI output for TVs and old players

Create AVI files intended for a wide range of devices, including older televisions, DVD players, projectors, and in-car systems that do not accept MP4. Recommended profiles help maximize compatibility, so your converted videos are more likely to play without errors.

Desktop batch MP4 to AVI conversion for many files

Install the desktop version to handle large workloads: import multiple MP4 videos at once and convert them all to AVI in a single batch. This is ideal for editors, trainers, or archivists who must reformat entire folders of material beyond typical browser limits.

Desktop control over AVI parameters and file size

On desktop, fine-tune resolution, bitrate, frame rate, and encoder settings for AVI output. Balance quality and file size, create presets for specific players, or optimize videos for editing workflows, going far beyond the simplified fixed settings of the online converter.

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Batch Convert Now
Convert Online
Batch Convert Now
Convert Online

MP4 to AVI Conversion FAQs

Yes, you can convert MP4 to AVI while keeping very similar quality if you choose reasonable settings. The process always re-encodes the video, but by matching resolution and using an appropriate bitrate, most users will not notice visible loss in everyday playback.
Neither format is automatically better; quality mostly depends on the codec and bitrate used. MP4 is more efficient and usually produces smaller files, while AVI can be favored by older players. If a device only supports AVI, converting improves compatibility, not raw quality.
Conversion time depends on video length, file size, server load, and your internet speed. Short clips may finish in under a minute, while long HD movies can take several minutes or more. Keeping the browser open and avoiding other heavy downloads helps ensure stable progress.
For occasional medium files, the online converter is convenient and free, though very large uploads may hit browser or network limits. For big projects and many hours of footage, a desktop application is usually best because it avoids bandwidth issues and supports batch workflows.
Missing audio usually means the original track used a codec the target profile did not handle correctly. Try converting again with a different audio setting in the converter, or use the desktop version where available, which often offers broader audio codec support and repair options.

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“I have been using Wondershare UniConverter for many years. It has been one of the best ways to download, screen capture and convert videos. It has been my go to for video download and conversion.”

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“Wondershare has so many assets, not just for downloading media. You can convert to other formats. You can create GIFs and clean up videos. There are way too many assets you can use with WonderShare UniConverter that it's a MUST for any video editor or graphics designer. It's worth every penny.”

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“Over the years, Wondershare Uniconverter has really transformed into a powerhouse of tools. You can download, convert, crop, compress, enhance the quality, remove the background and do ton of other useful ops. We can do it for Video, Audio, and images, either individually or in batches.”

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“Wondershare UniConverter has completely exceeded my expectations! The software is incredibly fast, easy to use, and supports a wide range of file formats. I was able to convert large videos in just minutes without losing quality. The interface is clean and intuitive, making it beginner-friendly while still offering advanced features for power users. ”

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“Wondershare Video Converter is hands down one of the best tools I’ve added to my creative toolkit. It’s fast, easy to use, and incredibly powerful. Whether I need to convert large video files into different formats, compress them without losing quality, or even edit and trim clips, this software handles it all with ease.”

— TG

“I have been using Wondershare UniConverter for many years. It has been one of the best ways to download, screen capture and convert videos. It has been my go to for video download and conversion.”

— Alan Horner

What Users Say About Our MP4 to AVI Converter

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Convert MP4 to AVI Now or Upgrade to Desktop Control

Start by converting an MP4 to AVI directly in your browser for quick, free compatibility fixes. When you need batch processing or detailed control over output settings, download the desktop app and handle large video projects more efficiently on your computer.
Batch Process Now Upload MP4 File
Batch Process Now Upload MP4 File
Batch Process Now Upload MP4 File
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