How to convert AVI to MP3 online
- 1
Drop your AVI file
Drag your Audio Video Interleave file onto the box above, or click it to pick a file.
- 2
Wait a few seconds
Conversion starts on its own and runs on your device, not on a server.
- 3
Download your MP3
Click Download to save the MPEG-1 Audio Layer III file.
AVI vs MP3: format overview
Audio Video Interleave
Microsoft · 1992
- Compression
- lossy
- Transparency
- No
- ✓ Universal Windows compatibility
- ✓ Simple container format — widely supported
- ✗ Large file sizes (minimal compression)
MPEG-1 Audio Layer III
Fraunhofer Society · 1993
- Compression
- lossy
- Transparency
- No
- ✓ Universal compatibility — plays everywhere
- ✓ Good compression at 128–320 kbps
AVI magic bytes: 52 49 46 46 xx xx xx xx 41 56 49 20
MP3 magic bytes: 49 44 33 (ID3) / FF FB
Why convert AVI to MP3?
AVI is a container format from 1992, and while it is still recognized by nearly every video player ever made, it was never designed with audio extraction in mind. Old camcorder footage, DVD rips, and files from early digital cameras often arrive as AVI, and the audio inside — sometimes MP3, sometimes PCM, sometimes an older codec — is completely inaccessible to music players, podcast apps, or mobile devices.
MP3 remains the single most universally compatible audio format in existence. Every smartphone, car stereo, smart speaker, and audio platform on earth can play an MP3. It carries decades of backward compatibility that no other format can match. When you need the audio from an old AVI to be playable literally anywhere, MP3 is the answer.
This converter extracts the audio track from your AVI and encodes it as an MP3 file. AVI files can contain audio in various codecs — if the source is already MP3, the extraction is fast with no re-encoding. If it uses PCM or another codec, it will be encoded to MP3 at a quality suitable for music and voice. File sizes are small and the output works on every device without any additional software. Old footage audio becomes instantly portable.
Quality & file size: AVI to MP3
Typical sizes: AVI 200–600 MB (1 minute 1080p); MP3 3–5 MB (3-minute song).
MP3 output is encoded at 192 kbps.
Re-encoding one lossy format into another adds a second round of compression.
Frequently asked questions
What audio format is usually inside an AVI file?
Is it legal to extract audio from an AVI I downloaded?
Your AVI file never leaves this tab — FormatDrop has no endpoint that receives file data. How it works