Convert AVI to MP4

Transform your classic microsoft video container into MP4 format. Free, private, and browser-based.

How it works

  1. Upload AVI Files — Drag and drop your AVI files into the converter, or click to browse. Common sources: older cameras, windows applications.
  2. Convert to MP4 — The converter processes your files to MP4 format entirely in your browser. No files are uploaded to any server — your privacy is guaranteed.
  3. Download Results — Download your converted MP4 files instantly. For multiple files, download individually or as a ZIP archive.

Why convert AVI to MP4

  • Ensure maximum compatibility — MP4 works on virtually every device and platform
  • Make AVI files accessible on macOS, Linux, and mobile devices
  • Significantly reduce file size — MP4 files are much smaller than AVI
  • Leverage MP4 advantages: universal playback on every platform
  • Overcome AVI limitations: very large files

FAQ

Is AVI to MP4 conversion free?
Yes, Fileza.io converts AVI to MP4 completely free with no limits on file size or number of conversions. No hidden fees, no watermarks, and no account required.

Will I lose quality converting AVI to MP4?
Both AVI and MP4 use lossy compression. Output quality is excellent at high quality settings (85%+) — most people cannot see any difference.

Is it safe to convert AVI to MP4 online?
Absolutely. Unlike most online converters, Fileza.io processes your files entirely in your browser using WebAssembly. Your AVI files are never uploaded to any server — the conversion runs on your own device, keeping your files 100% private.

Can I convert multiple AVI files to MP4 at once?
Yes, Fileza.io supports batch conversion. Drag and drop multiple AVI files at once and they will all be converted to MP4 simultaneously. Download them individually or as a ZIP archive.

Does AVI to MP4 conversion work on mobile?
Yes, the converter works on any device with a modern web browser — iPhones, iPads, Android phones, and tablets. No app installation required.

Will the converted MP4 files be smaller or larger than AVI?
Yes, MP4 files are typically much smaller than AVI. You can expect significant file size reduction, often 50-90% smaller depending on content and quality settings.

How long does AVI to MP4 conversion take?
Most conversions complete in seconds. The exact time depends on file size and your device performance. Since processing happens locally in your browser, faster devices convert more quickly. Video files may take longer due to re-encoding.