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HomeAVI vs MP4
.avi
.mp4

AVI vs MP4

Compare Audio Video Interleave and MPEG-4 Video formats — understand the key differences and when to use each

Format Overview

AVI

Audio Video Interleave

AVI (Audio Video Interleave) is a multimedia container format introduced by Microsoft in 1992 as part of Windows 3.1. AVI stores interleaved audio and video data and supports a wide range of codecs including DivX, XviD, MPEG-4, and uncompressed video. While AVI is one of the oldest video formats still in use, it has several limitations: no native support for modern codecs (H.265), subtitles require external files, and streaming capabilities are limited. AVI files tend to be larger than MP4 or MKV equivalents. However, AVI remains widely supported by media players and video editing software. Many legacy video cameras and older devices output AVI files. Converting AVI to MP4 typically reduces file size while maintaining quality and improving compatibility with modern devices.

.avivideo

MP4

MPEG-4 Video

MP4 (MPEG-4 Part 14) is the world's most widely used video container format, standardized as ISO/IEC 14496-14. MP4 can contain video (H.264, H.265/HEVC, AV1), audio (AAC, MP3, AC-3), subtitles (SRT, ASS), and metadata in a single file. H.264/AVC is the most common video codec in MP4 files, providing excellent quality at reasonable file sizes. MP4 supports 4K, 8K, HDR (HDR10, Dolby Vision), 360° video, and multiple audio tracks. It's the default video format for smartphones, digital cameras, streaming services (YouTube, Netflix), social media platforms, and web browsers. MP4 files are natively playable on virtually every device and operating system without additional software. The format supports fast seeking, progressive download, and adaptive streaming (DASH). For web video, MP4 with H.264 video and AAC audio provides the widest compatibility.

.mp4video

AVI vs MP4: Feature Comparison

FeatureAVIMP4
Full NameAudio Video InterleaveMPEG-4 Video
File Extension.avi.mp4
Categoryvideovideo
Free to Convert✓ Yes✓ Yes
Browser Support✓ All Browsers✓ All Browsers
Convert to Each Other✓ Yes✓ Yes

When to Use AVI vs MP4

Use AVI when you need:

  • •Files in Audio Video Interleave format for maximum compatibility
  • •Industry-standard video format support
  • •Wide software and platform compatibility

Use MP4 when you need:

  • •Files in MPEG-4 Video format for specific workflows
  • •Optimized video format features
  • •Modern format advantages and smaller file sizes

Convert Between Them

AVI MP4MP4 AVI
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Frequently Asked Questions

What is the difference between AVI and MP4?
AVI (Audio Video Interleave) and MP4 (MPEG-4 Video) are both video file formats. AVI files use the .avi extension while MP4 uses .mp4. They differ in compression, quality, compatibility, and intended use cases.
Can I convert AVI to MP4 for free?
Yes! Convert999 lets you convert AVI to MP4 completely free, directly in your browser. No file upload to any server, no registration needed — your files stay private on your device.
Which is better, AVI or MP4?
It depends on your use case. AVI (Audio Video Interleave) may be better for certain workflows, while MP4 (MPEG-4 Video) excels in others. Consider factors like file size, quality, software compatibility, and your specific needs.
Is it safe to convert files on Convert999?
Absolutely. Convert999 processes all files 100% locally in your browser. Your files are never uploaded to any server, ensuring complete privacy and security.

AVI Converter

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Format Statistics

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