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Convert Large MP4 to AVI Format
  • Convert MP4 to AVI or other 150+ formats without losing quality.
  • Compress MP4 to AVI to smaller size by changing video size, resolution, bit rate, quality, etc.
  • Supports batch process.
  • Download videos with URL from YouTube, Facebook, Vimeo, Vevo, and other 1000+ sites.
  • Crop, cut, rotate video, or add watermark, effects to video easily.
  • Toolbox includes: Fix Metadata, GIF Maker, Screen Recorder, Video Compressor, etc.

How to Convert Large MP4 Files to AVI Online?

by Brian Fisher

The need for MP4 to AVI conversion may arise due to a number of reasons and for this, a good tool is needed. Online programs are used by a large number of people as they are free tools and have a simple interface. If you are looking forward to convert large MP4 to AVI online, you may be disappointed as online tools have a limitation to the file size that can be added. Know more about how to compress large MP4 to AVI below.

Part 1. Best Tool to Compress MP4 to AVI to Smaller Size

Trying to convert large MP4 files to AVI? – Install UniConverter and get the best quality files in no time. The professional desktop software works on Windows and Mac system and facilitates file conversion in almost all popular formats. There is no limitation to the file size or the number of files that can be added to the program for the conversion. The process is quick and results in high-quality files. The built-in editor can be used to create some amazing personalized videos if needed.

Get the Best MP4 to AVI Compressor:

  • Convert large MP4 to AVI without losing quality at super fast speed.
  • Allows adding multiple files at a time for batch processing.
  • Convert videos in 150+ formats, including MP4, AVI, MKV, MPEG, MOV, WMV, FLV, etc.
  • Crop, trim, rotate video with ease, or add subtitle, watermark, apply effects to the video.
  • Download online videos in batch from 1000+ sites, like YouTube, Facebook, Vimeo, Vevo, etc.
  • Burn videos to DVD, burn music files to CD, record screen, fix video metadata, etc.
  • Compatible with all latest versions of Windows and Mac PC.

Guide to Convert Large MP4 Files to AVI using UniConverter

Step 1. Add large MP4 files

Run UniConverter on your PC and click on +Add Files button from the Convert section to add large MP4 files from your PC. You can add multiple files to the interface. The files from the connected devices can be added by opening the drop-down menu at +Add Files option.

Add large MP4 files

Optional: Edit Video
The icons for editing the added files appear below the thumbnail image. Select from the given icons that will open a new setting window. Make the changes related to trim, crop, cut, effects, watermark, and others at the window and save.

Edit Video

Step 2. Set the output format and compression settings

Click on the Convert all files to: button on the program interface and a new window showing the supported formats and devices will appear. From here, choose the Video tab and then select AVI format. You can keep the resolution of the files as the original one or can choose from the available options.

If you want to customize the video parameters to resize the AVI video, you can click the +Create Custom button to pop up a window, where you can change the video encoder, resolution, bitrate, frame rate and other settings to reduce video size.

Set the output format and compression settings

Step 3: Compress large MP4 to AVI

At Output section, you can choose the location on your computer where you want to save the converted files. Finally hit on the Convert All button to start converting large MP4 files to AVI format. The Converted tab on the software shows the list of these processed files from where they can be managed and transferred to the devices if needed.

Compress large MP4 to AVI

So if you want large size files to be converted, UniConverter is the best tool as it has no limitation or restriction to the file size. Online converters, on the other hand, have a limitation to the size and number of files that can be added at a time to their interface. Additionally, in terms or additional features, online converters have limited options in comparison to professional tools like UniConverter.

Free download it on your computer and have a try!

Part 2. Top Online Sites to Compress MP4 to AVI

Listed below are the top 3 online sites that can be used for converting MP4 files to AVI format.

#1. Convertio

This online tool supports converting files into an array of formats including MP4 to AVI conversion. Free to use, the program needs no software download and installation as it can operate from your browser window. The files to the software can be added from Google Drive, Dropbox, URL or PC. The maximum file size supported by the program is 100MB. Multiple files within the size limit can be added to the program. Once converted the files can be downloaded to your PC from the interface. There is also an option to save the processed files to your Google Drive or Dropbox account if needed.

File size limit: 100MB


#2. Online Converter

Convert your MP4 files to AVI in decent quality using Online Converter. The program allows adding files from PC or URL in case of online videos. The size limit allowed by the program is 200MB. To customize the added files, you can cut the part of the video by specifying the start and the end time. There is also an option to change the frame size in terms of height and width if needed. The interface is simple and the program results in decent quality output files that can be downloaded from the interface after the process.

File size limit: 200MB

Online Converter

#3. FreeFileConvert

FreeFileConvert allows adding files from your PC, URL, or the cloud storage for the conversion process. The software supports file conversion to an array of types of files including image, archive, documents, video, and others. Maximum 5 files with the combined file size of 300MB can be added to the software for the conversion. The processed and converted files are available at the program for the download. There is also an option to get the converted file on your desired email id.

File size limit: 300MB (maximum 5 files)


Thus it can be concluded that it is not possible to convert large MP4 files online as supported size is limited. Professional software like UniConverter is to be used for the task. Install the software and enjoy converting your files without worrying about its size.

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Brian Fisher

staff Editor