AVI Compressor
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Supports: AVI
Advanced Options - Our defaults are optimized for the best results. We recommend you keeping the defaults unless you have a specific need.
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Need help?How to Compress AVI Files Online
- Upload Your AVI Files: Click "+ Add Files" to select AVI files from your computer, Google Drive, or Dropbox. Batch upload supported.
- Choose Compression Settings: Select compression method — quality preset (Highest to Lowest), target file size percentage, specific file size in MB, constant/variable bitrate, or CRF quality level. Optionally change resolution (1080p, 720p, 480p, percentage, or custom dimensions).
- Download Compressed Files: Click "Compress" and download your smaller AVI files.
Why AVI Files Are So Large
Competitors like clideo.com offer AVI compression up to 500MB for free with no quantity limit. squeezevid.com claims "up to 90% reduction while maintaining excellent visual quality." freecompress.com provides a simple one-click workflow. XConvert offers more control with 6 compression methods (quality preset, target file size %, specific MB, constant/variable bitrate, CRF), video/audio codec selection, and resolution options from percentage scaling to custom dimensions.
Why AVI Files Are So Large
AVI (Audio Video Interleave) is Microsoft's legacy container from 1992. AVI files are typically large because they use older, less efficient codecs:
| Codec | Era | Typical 1-hour 1080p Size |
|---|---|---|
| Uncompressed AVI | — | 100-200GB |
| DivX/XviD (common AVI) | 2001-2010 | 1.5-3GB |
| H.264 (MP4) | 2004-present | 0.8-1.5GB |
| H.265 (HEVC) | 2013-present | 0.4-0.8GB |
Compression Methods
Reduce Resolution
Downscaling from 1080p to 720p reduces file size by ~50% and is often imperceptible on smaller screens or when streaming.
Lower Bitrate
Reducing the bitrate directly caps the data rate. A 5Mbps AVI compressed to 2.5Mbps is half the size with moderate quality reduction.
Reduce Frame Rate
Dropping from 30fps to 24fps saves ~20% with minimal visual impact for non-action content.
When to Keep AVI vs Convert
If you need to keep AVI format (legacy software requirement), compress within AVI. If format doesn't matter, converting to MP4 (H.264) gives you 40-60% smaller files at the same quality — the modern codec is simply more efficient.
Frequently Asked Questions
Is it free?
Yes. Completely free with no watermarks, no sign-up required, and no file count limits.
Does compression reduce video quality?
It depends on how aggressively you compress. Mild compression (70-80% quality) is barely noticeable. Heavy compression (below 50%) will show visible artifacts.
Can I compress multiple AVI files at once?
Yes. Upload multiple files and compress them all with the same settings.
Why are my AVI files so large compared to MP4?
AVI uses older codecs (DivX, XviD) that are 2-3x less efficient than modern H.264. This is inherent to the format, not a flaw in your files.
Does it work on mobile?
Yes. Works in any modern browser on all devices — no app installation required.