Kinds of online video converters have emerged on the Internet and they are becoming the most popular method of changing video formats. The most striking point of online converters is, they are installation free and available on major browsers, thus you can convert AVI to MP4 online on both desktop and mobile devices. However, facing a wide selection of tools, users need to separate the wheat from chaff. Of course, We have done this job for you. Here are the top 3 websites for video conversion.
1. Cloudconvert (https://cloudconvert.com/avi-to-mp4)
Cloudconvert can convert nearly all video files you throw into. And the conversion process requires only a few clicks: Upload your AVI video from URL, Google Drive, OneDrive, Dropbox, or computer, hit Convert and wait for the conversion to be finished, and Download the converted MP4 video. Meanwhile, this site offers extra setting options for modifying video parameters.
Cloudconvert only allows users to convert up to 25 files per day while flexible payment plans are provided by it. According to your actual needs, you can choose one of them for more conversions.

2. Zamzar (https://www.zamzar.com/convert/avi-to-mp4/)
On Zamzar, users are able to convert audio files, videos, images, eBooks, documents and more. It’s quite simple to convert AVI to MP4 on Zamzar, as well. Besides downloading the converted files from Zamzar directly, you can also submit your email for receiving links to the files.
I have to mention that Zamzer is a good option for free small conversions. Its free service only allows non-registered users to convert 2 files at very 24-hour period and the maximum file size limit is 150MB. Of course, if you sign into Zamzar, you’re able to free convert up to 100 files at one time with maximum 2 GB in size. Zamzar also provides premium services coming with increasing file size, concurrent conversions, storage, and other conversion features.
Related Post: How to Free Convert AVI to MP4 Over 1GB or 2GB? | How to Convert MP4 to MP3 Free Unlimited?

3. Convertio (https://convertio.co/avi-mp4/)
Convertio is another well-remarked video converter enabling users to convert AVI files to MP4. It performs pretty fast and has a simple & easy interface. You can convert files from local folder, cloud storage services, or URL to all common video file formats.
Like other free online conversion services, Covertio has limit for free file conversions. It supports to convert each file within 150MB, 10 files per 24 hours, as well as 2 concurrent conversions. Three payment plans are launched by Covertio, including Light, Basic, and Unlimited, which expend the functionalities and features corresponding to each tier price.
