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AVI Format — Complete Guide & Converter

Everything you need to know about the AVI file format: technical specifications, use cases, compatibility, and free conversion tools.

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What is a AVI File?

AVI (Audio Video Interleave) is a multimedia container format introduced by Microsoft in 1992. It's based on the RIFF (Resource Interchange File Format) structure also used by WAV files: an AVI file contains chunks of video and audio data interleaved so that they can be played back in sync, plus an index for seeking. AVI can hold video in many codecs. Files from the late 1990s and 2000s typically contain DivX or Xvid (MPEG-4 Part 2), Cinepak or Indeo from the CD-ROM era, MJPEG from digital cameras and webcams, or uncompressed video, usually with MP3 or PCM audio. The container itself is simple and widely supported on Windows, but it lacks modern features like reliable support for variable frame rates, B-frames, chapters and multiple subtitle formats, and the older codecs inside most AVI files aren't supported by many modern devices.

History of the AVI Format

Microsoft introduced AVI in November 1992 as part of its Video for Windows technology, competing with Apple's QuickTime. AVI became the standard video format on Windows PCs through the 1990s. The original format was limited to 1 GB (later effectively 2 GB) files; the OpenDML extensions of 1996 (AVI 2.0) lifted that limit. In the early 2000s, AVI with DivX or Xvid video became extremely popular for sharing video online and for burning to CDs, and many DVD players added "DivX" support to play them. Digital cameras and webcams also commonly recorded MJPEG AVI files. From the late 2000s, MP4 and MKV with H.264 video largely replaced AVI for new content, but huge archives of AVI files remain from that era.

AVI Technical Specifications

File Extension.avi
MIME Typevideo/x-msvideo
ContainerRIFF-based (like WAV)
Common Video CodecsDivX, Xvid, MJPEG, Cinepak, uncompressed
Common Audio CodecsMP3, PCM, AC-3
File Size LimitEffectively unlimited with OpenDML (AVI 2.0)
Developed ByMicrosoft (Video for Windows, 1992)
Best ForLegacy video and older systems

AVI Advantages & Limitations

Advantages

  • ✓Simple, well-understood container
  • ✓Broad support on Windows and in legacy software
  • ✓Works with many codecs, including uncompressed video
  • ✓Widely supported by older DVD players, TVs and set-top boxes
  • ✓Easy to edit in older editing software

Limitations

  • ✗Older codecs (DivX, Xvid, MJPEG) aren't supported by many modern devices
  • ✗Poor for web streaming
  • ✗Limited support for subtitles, chapters and multiple tracks
  • ✗Larger files than modern MP4 at similar quality
  • ✗Not accepted by many social and video platforms
  • ✗Limited metadata support

Common Use Cases for AVI

Today, AVI files are mostly legacy content: home videos from digital cameras and camcorders of the 2000s, webcam and early screen recordings, downloaded videos from the DivX/Xvid era, and footage from security cameras and industrial or scientific equipment that still record AVI. Some older editing tools, games and multimedia authoring programs also use AVI. The most common task is converting AVI to MP4 (H.264), which makes old videos playable on phones, Macs, TVs and browsers, allows uploading to YouTube and social media, and usually reduces file size substantially. AVI to MOV suits Mac users, and AVI to GIF turns short moments into shareable animations. Conversions to AVI are mainly for legacy systems that require it.

Convert AVI to Other Formats

Transform your AVI files to any of the supported target formats below. Each conversion preserves maximum quality and is completely free.

AVI to MP4AVI to GIFAVI to MOV

Convert Other Formats to AVI

Need to create AVI files from other formats? Use any of the converters below.

MP4 to AVI

AVI vs Related Formats

AVI is the oldest widely used video container. MP4 is its modern replacement with better compression support and universal compatibility; MKV is a more flexible open container; MOV is Apple's QuickTime equivalent; and WebM is the open format for web video.

MP4 Format Guide MOV Format Guide WEBM Format Guide MKV Format Guide

AVI — Frequently Asked Questions

What is an AVI file?

A video file in Microsoft's Audio Video Interleave container, introduced in 1992. Most AVI files contain older codecs such as DivX, Xvid or MJPEG.

Why won't my AVI play on my phone or Mac?

The container may be supported, but the codec inside often isn't. Converting to MP4 with H.264 makes it play everywhere.

What program plays AVI files?

VLC plays virtually all AVI files on every platform. Windows Media Player handles many, depending on the codec.

Is AVI better quality than MP4?

Not inherently. Quality depends on the codec and bitrate. MP4 with H.264 typically looks as good at a much smaller file size.

Can I upload AVI files to YouTube?

YouTube accepts AVI, but many other platforms don't. Converting to MP4 is the safest option.

Will converting AVI to MP4 reduce the file size?

Usually, yes, because H.264 is far more efficient than the codecs in most AVI files.

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