AVI to MP4 Converter
Convert Files from AVI to MP4 Format Online for Free
How to Convert AVI to MP4?
AhaConvert makes it easy to convert your AVI videos to MP4 format with a few clicks. No software needs to be installed. It runs in your browser on Windows, macOS, Android, and iPhone. Just use the following instructions to start your conversion immediately.
Upload AVI Video
Upload your AVI video file from a local device or a URL.
Select MP4 Format
Select MP4 as the target video format.
Download MP4 File
Download and save MP4 video file once the conversion is complete.
Supported Video Converters
MP4 converters
Besides AVI , AhaConvert can also convert any other video format to MP4. Check out the MP4 video converters listed below.
MOV to MP4
MKV to MP4
WebM to MP4
GIF to MP4
Video to MP4
WMV to MP4
MPG to MP4
TS to MP4
VOB to MP4
FLV to MP4
M4V to MP4
3GP to MP4
OGG to MP4
MXF to MP4
M2TS to MP4
DVR to MP4
3G2 to MP4
DV to MP4
WTV to MP4
MTS to MP4
RM to MP4
RMVB to MP4
SWF to MP4
MOD to MP4
AVI converters
Besides MP4, AhaConvert can also convert AVI to other video formats. Check out the AVI to video converters listed below.
AVI to GIF
AVI to Video
AVI to MP3
AVI to MOV
AVI to MKV
AVI to WebM
AVI to WMV
AVI to WAV
AVI to MPG
AVI to 3GP
AVI to FLV
AVI to VOB
AVI to SWF
AVI to M4V
AVI to OGG
AVI to TS
AVI to FLAC
AVI to WMA
AVI to AAC
AVI to M4A
AVI to MXF
AVI to M2TS
AVI to DVR
AVI to DV
AVI to 3G2
AVI to MTS
AVI to MP2
AVI to Audio
AVI to M4R
AVI to RM
AVI to RMVB
AVI to AMR
AVI to MOD
AVI to WTV
AVI to Opus
AVI to AIFF
AVI to ALAC
AVI to AIF
AVI to M4B
AVI to OGA
AVI to 3GA
AVI to AIFC
AVI to CAF
Frequently Asked Questions
Why should I convert AVI to MP4
AVI is an older video format created by Microsoft in the early 1990s. It adopts minimal compression, which makes the files very large and often incompatible with modern players, phones, or online platforms. In contrast, MP4 is more universally supported. They are smaller in size, easier to share, and playable on most devices and browsers.
What is the difference between AVI and MP4 formats
AVI is an out-of-date container format that stores video and audio data with a little compression. Compared to MP4 (developed for efficiency), AVI files are usually very large and cannot be shared easily.
Is your AVI to MP4 converter free to use
Yes, you can freely convert AVI videos to MP4 for free in your browser. There is no software to install and no account required for simple conversions.
Can I convert an old DivX or Xvid AVI movie to MP4
Yes! Many older AVI files use the DivX or Xvid codecs. They were common in the early 2000s, but are no longer widely supported nowadays. AhaConvert automatically detects these older codecs and re-encodes the video into H.264 or H.265 inside an MP4 container. The resulting file (ending with .mp4) will play smoothly on modern devices, TVs, and editing software without installing special codec packs.
Why does my AVI video look stretched or squished after conversion
Some AVI files store a non-square pixel aspect ratio, which newer formats like MP4 interpret differently. When this occurs, the converted MP4 video may appear too wide or too tall. To fix it, check the original resolution and aspect ratio of your AVI file before conversion and then select the same values (for example, 16:9 or 4:3) in the converter settings if available. AhaConvert usually maintains the correct proportions automatically, but mismatched aspect settings can cause stretching.
Will MP4 work better for editing than AVI
Yes, particularly with modern editing software. Most video editors, including Adobe Premiere Pro, DaVinci Resolve, iMovie, and Final Cut Pro, are optimized for MP4. AVI relies on older encoding methods that may not be hardware-accelerated and can lead to slow playback or rendering. Converting AVI to MP4 ensures smoother editing performance, faster previews, and easier exporting across platforms.
Are my files safe when I upload them to your AVI to MP4 converter
Absolutely. All the video files, whether uploaded or downloaded, are kept safe during processing. We use 256-bit SSL encryption, store files in a secure cloud environment, and automatically delete them within 24 hours.
Explore More File Converters
File convert tools
Unable to find the format you need? AhaConvert also provides these free online file converters:
Security and Privacy
At AhaConvert, your files are protected with enterprise-grade security. We use 256-bit SSL encryption during transfer, store your data in a secure cloud environment, and guarantee automatic deletion within 24 hours. We fully respect your privacy – we will not view or share your files under any circumstances. Make sure your files are protected at every step, from upload to conversion.
SSL encrypted transmission
Automatically deleted within 24 hours
Privacy protection
Secure cloud storage