About AVI Files
AVI Video
AVI is a legacy Microsoft multimedia container that stores audio and video data. While largely superseded by modern formats, it remains widely recognized and is produced by many older devices and screen recorders.
Family
Video Files
Extension
.avi
MIME Type
video/x-msvideo
Can Use As
HOW AVI
CAME TO BE.
AVI — Audio Video Interleave — launched with Microsoft’s Video for Windows runtime in November 1992, built on the RIFF container Microsoft had introduced a year earlier for WAV audio. The design trick was right in the name: audio and video chunks are interleaved in the file so a playback engine can read one block of video, one block of audio, one block of video, and stream them to the decoder without seeking.
For a decade AVI was the Windows video format. Every Compaq PC came with Video for Windows preinstalled, every digital camera that recorded video produced AVI, and the entire early fan-sub anime scene and early divx piracy ran on AVI. The format is technically ancient — no proper support for modern subtitles, chapters, metadata, or variable frame rates — but its simplicity means you still encounter .avi files in security-camera exports, vintage game cut-scenes, and old family DV tape captures.
CURIOSITIES &
TRIVIA.
AVI's hard 2 GB file-size limit (later 4 GB) forced the "split into multiple files" workflow that defined early fan-subbing.
The original 1992 spec had no provision for variable bitrate video — a huge problem when MPEG-4 codecs arrived.
DivX, XviD, and the early 2000s piracy scene normalized AVI + MP3 audio as the default internet video format.
AVI does not support soft subtitles — subtitle tracks have to be burned into the video or shipped as external .srt files.
Modern codecs like H.265 technically work inside AVI but tooling is fragile and nobody does it.
STRENGTHS &
LIMITATIONS.
Strengths
- Simple, well-documented format — trivial for any video library to parse.
- Universal Windows playback since Video for Windows in 1992.
- Low encoding overhead — interleaved structure is fast to write.
- Works with any codec technically, including modern ones.
Limitations
- Aging container — no native support for chapters, subtitles, or multi-audio selection.
- File-size limits (2 GB original, 4 GB with OpenDML) break for HD content.
- Variable-framerate video causes sync drift.
- Larger than equivalent MP4 or MKV due to container overhead.
- Poor support on iOS and Android.
Typical Sizes & Weights
10-min video (XviD / MP3)
100-200 MB
45-min TV episode (DivX)
350-700 MB
2-hour movie (DVD rip)
700 MB - 1.4 GB
Technical Specifications
- MIME type
- video/x-msvideo
- Extension
- .avi
- Container
- RIFF
- Max file size
- 2 GB (original); 4 GB (OpenDML extension)
- Codec support
- Any codec via FourCC identifiers
CONVERT FROM
AVI
Common Use Cases
Legacy video playback, Windows media, screen recordings.
Related Formats
Popular comparisons
AVI vs MP4
Differences, file size, and when to choose each format.
AVI vs JPG
Differences, file size, and when to choose each format.
AVI vs PNG
Differences, file size, and when to choose each format.
AVI vs GIF
Differences, file size, and when to choose each format.
AVI vs MOV
Differences, file size, and when to choose each format.
AVI vs MKV
Differences, file size, and when to choose each format.
Popular AVI conversions
The most-requested destinations when starting from AVI.
Frequently Asked Questions about AVI
Frequently Asked Questions
AVI (Audio Video Interleave) is a multimedia container format introduced by Microsoft in 1992. It interleaves audio and video data streams and supports various codecs, though it lacks native support for modern features like subtitles and chapters.
AVI files play in VLC (recommended, free), Windows Media Player, KMPlayer, and most video editing software. Some AVI files may require specific codec packs depending on the encoding used.
MP4 is the better choice for almost all modern uses since it offers better compression, wider compatibility, and support for subtitles and chapters. AVI is mainly encountered with legacy video files and older camera recordings.