VidCompress / AVI compression
AVI files are bulky. Compress one and convert it to modern MP4 for a far smaller, universally playable file.
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AVI is an older container that tends to be very large because it often holds lightly compressed or uncompressed video. That makes AVI files awkward to email, upload, or store. Compressing one shrinks it dramatically and converts it to modern MP4, which is smaller and plays on practically everything.
VidCompress takes your AVI, re-encodes it to a target size, and outputs an MP4. Files under 300 MB are handled in your browser, so nothing is uploaded.
Quick reference
Choose a target size
Pick a destination preset (Email, Discord, WhatsApp, Telegram) or a custom MB target for where the file is going.
Drop in the AVI
Add your AVI file. Because AVI is often large, expect a big size reduction.
Compress and convert
VidCompress re-encodes the AVI to your target and converts it to MP4 in the same pass.
Download the MP4
Save the result — far smaller than the AVI and compatible with modern players and platforms.
How do I compress an AVI file?
Drop the AVI on this page and choose a target size. VidCompress re-encodes it smaller and converts it to MP4 in one step.
Why are AVI files so big?
AVI often stores video with little or no compression, so files are far larger than an equivalent MP4. Re-encoding to H.264 MP4 cuts the size dramatically.
Does it convert AVI to MP4?
Yes. The output is MP4 (H.264), which is smaller and far more widely supported than AVI.
Do I need to install anything?
No. AVI compression runs in your browser; files under 300 MB stay on your device.
Is it free?
Yes. The free plan compresses up to 300 MB locally with no signup or watermark.