How to Convert AVI to MP4 without Losing Quality

While AVI and MP4 are both common video formats, MP4 is more popular and works well on almost all devices, players, and social platforms. Converting AVI to MP4 is often necessary. If you're looking for the best AVI to MP4 converter for Windows or need a reliable tool for Mac, this guide offers the most direct solutions. Without further ado, let's start!

WonderFox HD Video Converter Factory Pro is a highly efficient desktop converter for Windows. It can easily handle almost all video and audio conversions, including AVI to MP4, and with GPU acceleration, it can process large AVI to MP4 conversions up to 50x faster while maintaining high output quality. Additionally, you can batch convert files, customize output parameters, and edit and compress videos before conversion.

📌 Key Features:

• High-quality AVI to MP4 conversion with no file size limit.
• Hardware acceleration for faster processing.
• Supports batch conversion of multiple files.
• Supports 500+ output formats (MKV, MPG, MOV, MP3, etc.).
• Customizable settings (codec, bitrate, resolution, frame rate).
• Built-in tools to cut, crop, merge, and compress videos.
• Safe and simple to use.

Click to download the converter and follow the steps below to convert your AVI files.

Download for Free

Download for Free

Please free download free download the best AVI to MP4 converter for Windows to get ready.

Launch the program and select Converter. Click Add Files to load your AVI files or drag and drop them directly into the program.

Click on the format icon on the right to open the output format page. Under the Video section, select the MP4 option.

Open Parameter settings to specify the encoders, resolution, bitrate, or frame rate as needed. For instance, you can set the video encoder to H264 and audio to AAC for optimal compatibility, or select HEVC or AV1 video encoder for a more efficient file size.

If you're not familiar with these settings, simply leave them as Smart-Fit to let the program choose the common settings based on the format you selected.

Before conversion, you can use the editing tools to refine the video or compress the file if you need.

Finally, click the ▼ button at the bottom to specify an output path and hit the Run button to start the conversion immediately.

💡 The software has hardware acceleration enabled by default. If your computer has a compatible GPU, you will see a GPU icon indicating a much faster conversion process.

💡 If you see a lightning bolt icon ⚡, it means the conversion does not require re-encoding. For example, if the source AVI file is encoded in H264 and you select MP4 (H264) as the output, lightning mode will be automatically activated. Conversion in this mode is lossless and extremely fast.

Since Macs don't natively support AVI files, especially those encoded with older video and audio codecs, it's highly recommended to use a powerful third-party tool like Permute. This professional and intuitive program allows you to start the conversion instantly by simply dragging and dropping files. It not only converts AVI to MP4 with high quality preserved, but also supports multiple preset formats for use on different Apple devices and apps without playback errors. Let's see how to convert AVI to MP4 on Mac with Permute below:

Step 1: Download Permute and complete the installation.

Step 2: Open the app and drag your AVI file into the main window.

Step 3: Ensure the output format is MP4.

Step 4: Click the Start button to begin conversion.

💡 Bonus Tip: If your AVI file is encoded with Motion JPEG video and PCM audio, you can directly export it to the MP4 format using QuickTime Player. Simply open the video with QuickTime Pro, click File > Export, then select the Movie to MPEG-4 option to save the file as an MP4 video.

The methods described above are the easiest ways to convert AVI to MP4 on Windows and Mac systems. But if you want to explore more free conversion options, have a look at the following tools: VLC, HandBrake, and FFmpeg.

Website: https://www.videolan.org/

VLC is a popular open-source media player that can also function as a basic file converter to turn AVI into MP4 for free on both Windows and Mac computers. If you already have VLC installed on your system, you can follow the steps below to try converting your AVI to MP4 format.

Step 1: Open VLC. Go to Media > Convert/Save.

Step 2: Click +Add to add your .avi files. (On Mac, you can only import one file at a time). Then click Convert/Save.

Step 3: Select H.264 + MP3 (MP4) from the Profile drop-down menu. If needed, click the Edit selected profile icon to modify codecs, resolution, quality, etc.

Step 4: Click Browse to set a destination folder and ensure the output file ends with the .mp4 extension.

Step 5: Click Start to begin the conversion. You can view the conversion progress on the progress bar.

Website: https://handbrake.fr/

HandBrake is a well-known open-source video transcoder suitable for users who need full control over the encoding, such as adjusting the encoder, filters, subtitles, bitrate, and other options. With the right settings, it can help you convert AVI to MP4 with excellent output quality.

Step 1: Open HandBrake and click Open Source to load your AVI file.

Step 2: Select a preset from the Preset drop-down list. The default Fast 1080p30 is recommended for average users.

Step 3: In the Summary tab, choose MP4 as the output format.

💡 You can open other tabs to modify the encoding settings. For instance, to maintain high quality, you can switch to the Video tab and set the video encoder to H.264 (x264) and the framerate to Same as source.

Step 4: Click Browse to rename the output file and set an output folder.

Step 5: Finally, press the green Start Encode button to start the conversion process at once.

Website: https://ffmpeg.org/ (you must add FFmpeg to your system PATH for it to function properly)

If you have some coding knowledge, you will find FFmpeg a great option. This open-source, command line tool can process video, audio, and other multimedia files and streams. With it, you can quickly convert and edit a .avi file to .mp4 with desired quality and effects.

Step 1: Navigate to the folder containing the AVI video you want to convert. Type "cmd" to replace its file path. Then press Enter to bring up the FFmpeg command window.

Step 2: Run the following command and press Enter:
ffmpeg -i input.avi output.mp4
By default, FFmpeg will convert your file to MP4 using H.264 for video and AAC for audio.

You can also specify the output settings, including codec, resolution, bitrate, etc. For example, to convert a 1920x1080 AVI video to a 720x480 H.265 MP4 with AAC audio at 128 kbps, a frame rate of 25 fps, and 128kb/s audio, use this command:
ffmpeg -i input.avi -vf scale=720:480,fps=25 -c:v libx265 -crf 28 -c:a aac -b:a 128k output.mp4

If you want to convert AVI to MP4 without losing quality (called remux), execute this command:
ffmpeg -i input.avi -c:v copy -c:a copy output.mp4

🔔 Note: The remux command only works when the encoders in AVI are also supported by MP4. Otherwise, the resulting MP4 video may be unplayable.

How to convert AVI to MP4 without downloading software? An online video converter is what you're looking for. Compared with the desktop solutions, online tools are more convenient as they can perform the conversion right in your browser. All it requires is a stable network connection. Take ConvertFiles as an example. It requires no sign-up and is easy to use.

Step 1: Visit Online AVI to MP4 Converter by ConvertFiles: https://www.convertfiles.com/convert/video/avi-to-mp4

Step 2: Click Choose Files to upload your AVI video. The maximum file size for upload is 250MB.

Step 3: Double-check that the target format is MP4. Then click Convert Now.

Step 4: After processing, click Download file to save it to your device.

For individuals, there is no single best tool, only the most suitable one. Depending on your needs, you have different choices. For example, for Windows users, WonderFox HD Video Converter Factory Pro is a good choice for quickly converting AVI to MP4 or batch converting, while for Mac users, Permute is a very convenient tool. And if you only occasionally need to convert a few small video files, an online tool is a better choice.

It's best to use tools that support hardware acceleration, such as WonderFox HD Video Converter Factory Pro. Depending on the encoding formats supported by your computer hardware, converting AVI to MP4 using H264, HEVC/H265, or AV1 can be 20-50 times faster than conversion without acceleration.

Generally, converting AVI to MP4 will lead to some loss of quality. Since AVI files are typically encoded using DivX or Xvid, converting them to MP4 involves re-encoding, so quality loss is inevitable. But there is an exception: if the source AVI file is already encoded with H.264, you can convert it to an MP4 container using the same H.264 codec without transcoding. Of course, this requires using software that supports such direct conversion, such as WonderFox HD Video Converter Factory Pro or FFmpeg.

You can use open-source tools such as VLC, HandBrake, or FFmpeg to handle the conversion completely for free.