How to convert AVI to AAC online
- 1
Drop your AVI file
Drag and drop your Audio Video Interleave file onto the converter, or click to browse your files. You can select up to 5 at once. Nothing leaves your device — conversion happens right here in the browser.
- 2
Hit Convert — it happens locally
Click Convert and watch it go. There's no upload, no server queue, no waiting. The converter runs Audio Video Interleave → Advanced Audio Coding entirely in your browser tab. Most files finish in 1–3 seconds.
- 3
Download your AAC
Your Advanced Audio Coding file is ready. Click Download, or grab a ZIP if you converted a batch. Close the tab and everything disappears — no copies kept anywhere.
AVI vs AAC: format overview
Audio Video Interleave
Microsoft · 1992
- Compression
- lossy
- Transparency
- No
- ✓ Universal Windows compatibility
- ✓ Simple container format — widely supported
- ✗ Large file sizes (minimal compression)
Advanced Audio Coding
Dolby, Fraunhofer, Sony, Nokia · 1997
- Compression
- lossy
- Transparency
- No
- ✓ Successor to MP3 — better quality at same bitrate
- ✓ Native support across Apple, Android, YouTube
AVI magic bytes: 52 49 46 46 xx xx xx xx 41 56 49 20
AAC magic bytes: FF F1 (ADTS) / 00 00 00 xx 66 74 79 70
Why convert AVI to AAC?
AVI was the dominant video format of the 1990s and 2000s, and a massive amount of footage — home videos, early digital camera recordings, DVD rips — still exists in this container. But the audio inside those files, often encoded as MP3 or raw PCM, is invisible to modern streaming platforms, Apple devices, and mobile apps that have moved entirely to AAC.
AAC has been the dominant audio codec for over a decade. It powers YouTube, Spotify, Apple Music, iTunes, and every Apple device ever made. It is more efficient than MP3 at equivalent bitrates, meaning better sound quality in smaller files. Android and iOS both support it natively, and every major browser can decode it without plugins.
Converting AVI audio to AAC gives you a modern, compact audio file that works everywhere. The converter extracts the audio from the AVI and encodes it as AAC. If your source AVI has good-quality audio, the AAC output at 192 kbps will be transparent to most listeners. If the original audio was already compressed, converting adds a small generational loss — unavoidable when going from one lossy format to another. For spoken word, podcasts, or background music, this loss is negligible.
Quality & file size: AVI to AAC
Typical file sizes: AVI 200–600 MB → AAC 2–5 MB.
Both AVI and AAC use lossy compression. We transcode at high quality settings (equivalent to AAC's recommended web quality) to minimize generational loss.
Color depth: AVI supports standard color, AAC supports standard color.
Transparency: AVI does not support transparency. AAC does not support transparency — transparent areas become solid white.
Frequently asked questions
Privacy: how FormatDrop handles your files
Your AVIfiles are converted 100% inside your browser. They are never uploaded to our servers, never stored, and never seen by anyone other than you. This isn't a privacy policy claim — it's an architectural guarantee: our server has no endpoint that receives file bytes.