🎬 AVI to MP4
Convert AVI to MP4 — Free & Private
Transform legacy AVI video files to modern MP4 format. AVI is an old Windows format — MP4 plays on every modern device, phone, and platform.
✓ Free forever✓ No upload✓ No signup✓ Instant
Ready to convert your AVI to MP4?
100% in your browser · FFmpeg-powered · Instant download
How to Convert AVI to MP4
1
Open the Converter
Click "Convert Now" — opens on the Video tab with AVI → MP4 pre-selected.
2
Upload Your AVI
Drag & drop your video file or click Browse. Up to 500 MB supported.
3
Convert Instantly
FFmpeg runs entirely in your browser — no server upload needed.
4
Download MP4
Your converted file downloads automatically, ready to use.
Why Convert AVI to MP4?
- 🎬 AVI is an outdated format — MP4 is smaller, faster, and plays on every modern device
- 💾 Modern streaming — MP4 streams smoothly online while AVI requires full download
- 📦 Batch support — convert multiple files at once with Batch Convert mode
- 🔐 100% private — files stay on your device, never uploaded to any server
- 🆓 Free forever — no watermarks, no limits, no credit card
- ⚡ Instant — FFmpeg WebAssembly runs directly in your browser
Features
100% Private
Files never leave your browser. Zero server uploads.
FFmpeg-Powered
Industry-standard FFmpeg runs as WebAssembly in your browser.
Free
No account, no fee, no watermarks. Ever.
Batch Convert
Convert multiple AVI files to MP4 in one go.
High Quality
Output quality matches the original source video.
Mobile-Friendly
Works on any device — phone, tablet, desktop.
Frequently Asked Questions
Yes, completely free with no limits or watermarks. Convertlo runs entirely in your browser.
No. All conversion happens locally in your browser using FFmpeg compiled to WebAssembly. Your files never leave your device.
Yes. The conversion preserves video quality at a high bitrate setting. Output quality depends on the original file quality.
AVI is an outdated format — MP4 is smaller, faster, and plays on every modern device
Yes — enable Batch Convert mode to process multiple AVI files at once, each producing its own MP4 output.