AVI to MP4 Converter
Drop your AVI video here
Convert AVI to MP4 — free, fast, server-powered
Video is uploaded, converted server-side, then auto-deleted after 60 min.
How to Convert AVI to MP4 Online
Drag & drop or click Browse. Max 2 GB.
Choose bitrate for output quality.
Click Convert, wait for FFmpeg, then download. Auto-deleted after 60 min.
Why Convert AVI to MP4?
Converting AVI to MP4 dramatically reduces file size while maintaining quality, and makes your video compatible with virtually every modern device, browser, and platform. This is one of the most common video conversions.
About the AVI Format
AVI is one of the oldest video container formats, introduced by Microsoft. It can hold video and audio data compressed with various codecs, or even uncompressed video. AVI files tend to be large but maintain high quality, making them common in video editing and legacy media libraries.
AVI was introduced by Microsoft in 1992 as part of Windows 3.1. Despite its age, it remains widely used due to its simplicity and broad codec support, though modern formats like MP4 and MKV have largely replaced it for distribution.
✅ Advantages
- Simple, widely recognized container format
- Supports many different video and audio codecs
- High compatibility with Windows-based software
- Good for archival of uncompressed video
❌ Disadvantages
- Large file sizes compared to modern formats
- No native support for subtitles or chapters
- Limited streaming capability
- Outdated metadata and indexing features
About the MP4 Format
MP4 is the most widely used video container format on the internet. It typically uses H.264 video compression and AAC audio, delivering excellent quality at relatively small file sizes. MP4 is universally supported across browsers, devices, streaming platforms, and social media sites.
MP4 was introduced in 2001 as part of the MPEG-4 standard by the ISO. It evolved from Apple's QuickTime format and became the dominant web video format thanks to its balance of quality, compression, and universal device support.
✅ Advantages
- Universal playback support on all devices and browsers
- Excellent compression-to-quality ratio with H.264
- Supports subtitles, chapters, and multiple audio tracks
- Ideal for streaming, sharing, and social media uploads
❌ Disadvantages
- Lossy compression means some quality is sacrificed
- H.264 encoding can be slow on older hardware
- Not ideal for professional lossless editing workflows
Frequently Asked Questions
How much smaller will my MP4 be?
Depending on the original AVI codec, you can expect 50-90% file size reduction. An uncompressed 1GB AVI might compress to under 100MB as MP4 with minimal visual difference.
Will I lose quality converting AVI to MP4?
If your AVI contains uncompressed video, converting to MP4 involves lossy compression — but at high bitrates, the difference is imperceptible. If the AVI already uses a lossy codec, there is an additional small quality reduction.
Why should I convert my AVI files?
AVI is an outdated container with large files and poor streaming support. MP4 offers better compression, universal playback, and is accepted by all social media and streaming platforms.
Can I upload AVI to YouTube?
YouTube accepts AVI but recommends MP4 with H.264. Converting to MP4 before upload ensures faster processing and better quality on the platform.