How to Free Convert AVI to MP4

Laura Goodwin Mar 01, 2024 Convert Video

“How to convert my AVI files to MP4 format? The files are too large to transfer.”

“Why can’t I play my AVI videos? There are so many times! What is more? Even if it can be played, but there are some inexplicable problems! Who can help with it?”

Convert AVI to MP4 Online

Although the files of AVI format are being popular, it does not work well. The greatest advantage of this video format is that it can be used across multiple platforms. But there are many other problems to solve. Its volume is too large, and even worse, the compression standard is not uniform. Because of video encoding issues, some AVI format videos cannot be played. And there are some inexplicable problems such as the inability to adjust the playback progress and the sound-free image.

Thus, to play your AVI files smoothly, we need to convert AVI to other formats, like MP4. As the most popular format of videos, MPEG-4 is specifically designed to play high-quality videos. It uses a very narrow band to compress and transmit data through frame reconstruction techniques to achieve the best image quality with minimal data. And the most attractive thing is that it can save small volume video files close to DVD quality.

So today, we recommend 4 free and easy ways of converting AVI to MP4.


Part 1. How to Convert AVI to MP4 Free Online

Online video converters are basically free and easy to use. You can convert your AVI files with the following online tools

1. Convert AVI to MP4 with Vidmore Free Online Video Converter

Vidmore Free Online Video Converter is not only free, but also has powerful converting function! This free video converter supports all popular formats of videos and audio, including MP4, AVI, MKV, MOV, FLV, FLAC, etc. You can also use it to convert videos to 1080p HD, 720p HD, SD without any quality loss.

Apart from converting, it offers video settings and audio settings for users to customize. Before you convert files, you can click the gear mark on the right of the files to select video settings and audio settings. The first one includes encoder, resolution, frame rate and video bitrate. The second one includes encoder, channel, sample rate and bitrate.

To fit the maximum range of users, Vidmore Free Online Video Converter works perfect both on Windows and Mac. It also can batch convert videos with high speed to save time for people in fast-paced life. No virus, no third-party software, no size limitation and no required signup! User can furthest trust it and use it than other video converters. This simple but powerful software enables you to convert video and audio files for free any time.

Step 1. Click "Add files to convert" on the web. Follow the tips to install Vidmore Launcher. Then open the program online.

Install the launcher

Step 2. Click "Add file" to input the source AVI files and select MP4 format as the target format.

Add files

Step 3. Click the gear mark on the right of the files to select video settings and audio settings.

Select settings

Step 4. Click "Convert" and choose the destination in the top-up window. Then it will start the process automatically for you.

2. Change AVI to MP4 with CloudConvert File Converter

CloudConvert is an online file converter. It supports nearly all audio, video, document, etc. It allows you to do video and audio preset before conversion. You can easily change the AVI file to MP4, and it has 10 free conversions every day. In the meantime, the video quality is decided by your setting, and you can convert multiple AVI videos at a time. There is no file size limitation, but it is obviously slow when converting large files.

Cloudconvert Interface

Step 1. Search CloudConvert on Google and open the official webpage.

Step 2. Click Select File and upload the AVI video file.

Step 3. Choose MP4 in the formats drop list. Click Convert to start processing.

Step 4. Download the converted MP4 file and save it to your computer.

3. Transform AVI to MP4 with Zamzar

Similar to CouldConver, Zamzar is a powerful converter of video, audio, image and document. You can convert your file into more than 1100 formats. But it has a limitation of file size and only 2 free times trail per day, so if your AVI video is not too many and smaller than 50MB, Zamzar will be a good choice.

Zamzar Interface

Step 1. Open in your browser.

Step 2. Click Choose File and upload your AVI video.

Step 3. Choose MP4 in the drop list after clicking the Convert to button.

Step 4. Start conversion by clicking the Convert Now button.

Part 2. Bonus: Use Vidmore Video Converter to Change AVI to MP4 Offline

Most online converters have limitations such as file size and they usually don’t support advance setting and batch conversion. Therefore, if you need to convert your large and multiple AVI files to MP4, an offline video converter is a good choice.

Vidmore Video Converter is one of the most comprehensive and powerful multi-format video converters in the market. It supports changing video and audio to more than 200 formats. Apart from simply converting formats such as AVI to MP4, it also offers you over 100 presets for popular devices. Let`s get to know more about it.

It is over so soon. Have a try. Vidmore Free Online Video Converter fits beginners perfectly and meets the basic needs of the old stager of video converting. It would be a better tool for you to convert AVI videos to MP4. In this way, your videos are compatible with more devices and also fix videos not playing on Android. Hope it works for you. Good luck!


  1. Convert video to 200+ formats including AVI to MP4
  2. Advanced settings before conversion, such as resolution, encoding, etc.
  3. Toolbox with useful tools such as video watermark remover, noise remover, video compressor, etc.
  4. Work on both Mac and Windows

Free Download

for Windows

Free Download

for macOS

Step 1. Click Free Download above, install and launch the software for format conversion.

Step 2. Upload the AVI video file by clicking Add File or center area. You can also drag files to the interface.

Add File

Step 3. Click Output Format and choose MP4 in the list.

Choose Format

Step 4. Use the Convert All button to start the conversion.

Part 3. FAQs about Converting AVI to MP4 Online

What is the difference between MP4 and AVI?

There is no such obvious difference between the 2 formats. In fact, AVI provides a slightly higher video quality than MP4, while MP4 has a larger compatibility.

How do I convert a large video to MP4?

You can use offline video converting software to convert software because there is seldom a video converter online free with no limit. Vidmore Video Converter has no size limitation and with hardware and 120 time loss acceleration, large file conversion is also fast.

How can I convert over 1GB AVI to MP4 with a converter online?

It`s not a good choice to use an online converter to convert large files. One reason is the file size limitation. Another is the uploading and processing speed. You can use an offline Vidmore Video Converter to convert large AVI files.


It is over so soon. Have a try. Vidmore Free Online Video Converter fits beginners perfectly and meets the basic needs of the old stager of video converting. It would be a better tool for you to convert AVI to MP4 online. To process large and multiple AVI videos, you can use Vidmore Video Converter. In this way, your videos are compatible with more devices. Hope it works for you. Good luck!

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