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

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.

AVI is an out-of-date container format that stores video and audio data with a little compression.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.

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.

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.

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.

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.

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:

Video Format

Image Format

Audio Format

Document Format

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