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Home > Tips > How to Compress AVI Videos – Convert AVI to MP4 for A Smaller Size

How to Compress AVI Videos – Convert AVI to MP4 for A Smaller Size

How to compress AVI videos if they take too much space on your computer? The easiest way is to convert AVI to MP4 with an AVI compressor. In this tutorial, 3 tools will be introduced.

Updated Dec 21,2018 | by Micky

Q: “How to compress AVI videos because there are many on my PC and their sizes are really large!”

AVI (Audio Video Interleave) is a multimedia container developed by Microsoft in 1992 as part of its Video for Windows software.

AVI is notable for its good compatibility with Windows-based media players or other devices with related codecs. Also, this format has a very good output quality compared with its counterparts.

However, AVI videos usually come along with large sizes, eating much storage of your computer.

How to compress AVI to have a smaller size?

Converting AVI to MP4 may be a good choice. MP4 videos tend to have a smaller size than AVI when both in the same video quality. Meanwhile, MP4 also shares better compatibility with portable devices like iPhone and iPad.

In the following contents, I will bring you the top 3 AVI compressors

How to compress AVI videos

Hot Search: How to Convert FBR to MP4, AVI, and Other Formats | How to Convert WRF to MP4 for A Better Compatibility | How to Compress Videos on iPhone with Siri Shortcuts

Compress AVI Using VLC - the Most Basic Way

How to reduce AVI file size?

To convert AVI to MP4 to have a smaller file size, if you’ve already downloaded VLC, then, things can be easier for VLC is both a media player and a professional video converter. Just follow the steps below.

1.       Launch VLC Media Player on your PC.

2.       Click on “Media” in the top menu and choose “Convert/Save”.

3.       Click on “Add”, find the AVI video you want to convert and import it onto the interface.

4.       Click on “Convert/Save”

5.       Choose MP4 as the output format in “Profile”.

6.       Preset an output path and start the video conversion.



The time the conversion takes basically relies on the length of the video.

Reduce the Size of AVI by Using Third-party Video Converter - A Free and Effcient Way

If you haven’t installed VLC or are looking for a video converter which provides more formats to choose from, then, IOTransfer might be your best choice.

IOTransfer gives more than 20 video and audio formats including MP4, MKV, MOV, MP3, and FLAC for conversion and meanwhile, it allows you to transfer the converted video to iDevices including iPhone and iPad.

Moreover, IOTransfer is a functional App and it also supports video download, GIF making, and iOS cleaning.

What are you waiting for? Free download it and have a try!

Compress AVI to MP4 with 3 Steps

Step 1 Connect the iDevice to PC

Tips: You can skip this step if you don’t need to transfer the converted video to any iDevices.

Install and launch IOTransfer, connect your iPhone to a computer and wait until the device gets recognized. If the notification “Trust This Computer” pops up on the display, tap on “Trust” to continue.


Step 2 Preparation before the Video Conversion

Click on “VIDEOS” in the top toolbar. In the opened page, click on “Converter” on the left. Then, click on “Add Files” to import the AVI video you want to compress and in “Output Format”, choose MP4. Tick off the option “Automatically transfer the converted video into your iDevice” and remember to preset an output folder.


Step 3 Begin Video Conversion

Click on “Convert Now” to start the video conversion. After the progress bar is 100%, you’re supposed to wait until the loop circling around the iPhone icon stops. Then, you can find the output MP4 video in both the folder you previously set and in the video App on your iPhone.


Reduce AVI File Size with An Online AVI Compressor - Simple but Slow

VideoSmaller is a highly efficient online video compressor which allows you to compress AVI, MP4, and videos in other formats. With VideoSmaller, the size of the video can be reduced by over 30% at most which saves quite a lot of storage space.

1.       Go to the website of VideoSmaller.

2.       Click on “Browse”, select and import the AVI file you want to compress.

3.       Click on “Upload Video” and wait for the compression to be finished.

4.       After completed, click on “Download File” to download the output video into your PC.



The conversion speed mainly relies on your network condition. It can take a long time for the conversion to be completed if the local network is not good enough.

Bottom Line

How to compress AVI videos? In the article above, I provided you with the top 3 ways to reduce AVI file size. Choose the one you like best and have a free try.

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