Reduce AVI File Size Online Free
AVI is an older video format that produces large files due to inefficient compression. Our free AVI compressor helps you reduce AVI file size by converting to modern MP4 format with H.264 encoding — all in your browser, no uploads required.
Drop your video here or click to browse
Supports MP4, WebM, MOV, MKV, AVI and 10+ more formats · Max 2GB
Why AVI Files Are Large
AVI (Audio Video Interleave) is a Microsoft format from the 1990s that uses inefficient compression codecs. AVI files can be 5-10 times larger than equivalent MP4 files. Converting AVI to MP4 with modern H.264 encoding can reduce file size by 80-90% while maintaining quality.
How to Reduce AVI File Size
Upload your AVI file, select a compression preset, and click compress. Our tool will convert the AVI to MP4 format using H.264 encoding, dramatically reducing file size. The output MP4 file will have better compatibility across modern devices and platforms.
AVI to MP4 Conversion
Converting AVI to MP4 is the most effective way to reduce file size. MP4 with H.264 encoding is 5-10x more efficient than AVI codecs. Our compressor automatically converts AVI to MP4 during compression, giving you a smaller, more compatible file.
Compressing Old AVI Videos
Old AVI videos from digital cameras and early smartphones can be compressed significantly. Use the 'Best Balance' preset for most old videos. If the video is already low quality, use 'Smallest File' to maximize compression. The output MP4 will play on all modern devices.
Frequently Asked Questions
How do I reduce AVI file size?
Upload your AVI file to our compressor, select a preset, and click compress. The tool converts AVI to MP4 with H.264 encoding, reducing file size by 80-90%.
Can I convert AVI to MP4?
Yes! Our compressor outputs MP4 format by default, so your AVI file will be converted to MP4 during compression. This dramatically reduces file size and improves compatibility.
Why are AVI files so large?
AVI uses older, inefficient compression codecs. Converting to MP4 with H.264 encoding can reduce file size by 80-90% while maintaining quality.
Is AVI still supported?
AVI is still supported by most media players, but MP4 is more widely compatible across modern devices, browsers, and platforms. Converting AVI to MP4 improves compatibility.
Related Tools & Guides
Reduce MP4 File Size Online Free
Reduce MP4 file size online for free. Compress MP4 videos by up to 90% without quality loss. No upload, no sign-up, no watermark. Works in browser.
Reduce MOV File Size Online Free
Reduce MOV file size online for free. Compress MOV videos from iPhone, QuickTime, and cameras. No upload, no sign-up, no watermark. Browser-based.
Reduce WebM File Size Online Free
Reduce WebM file size online for free. Compress WebM videos for web optimization. No upload, no sign-up, no watermark. Browser-based compression.
Reduce Video File Size Online Free
Reduce video file size by up to 90% online for free. Supports MP4, MOV, AVI, MKV, WebM. No upload, no sign-up, no watermark. 100% private browser-based.
Ready to Compress Your Video?
Free, private, and fast. No sign-up required.
Start Compressing