Convert AVI to AAC Online Free
Extract the audio from your AVI video and save it as AAC — the modern, efficient audio format that plays on every device. Great for modernizing audio from legacy AVI collections.
ChangeThisFile extracts audio from your AVI video and encodes it as AAC using FFmpeg on our secure servers. AAC modernizes legacy AVI audio with better quality-per-bit and universal compatibility on iOS, Android, and streaming platforms. Files are auto-deleted, free with no signup needed.
Convert AVI to AAC
Drop your AVI file here to convert it instantly
Drag & drop your .avi file here, or click to browse
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AVI vs AAC: Format Comparison
Key differences between the two formats
| Feature | AVI | AAC |
|---|---|---|
| Type | Microsoft video container | Lossy audio bitstream (ADTS) |
| Developer | Microsoft | MPEG / ISO standard |
| Audio codec | MP3, PCM, or AC-3 | Advanced Audio Coding |
| File size | Moderate to large (video included) | Small — efficient audio-only |
| Mobile compatibility | Poor — limited smartphone support | Excellent — native on iOS and Android |
| Quality vs size | MP3 or PCM quality | Better than MP3 at same bitrate |
| Use case | Legacy Windows desktop playback | Mobile apps, streaming, automotive, modern devices |
When to Convert
Common scenarios where this conversion is useful
Modernize legacy AVI audio for mobile device playback
AVI files are not supported natively on most modern smartphones. Extracting the audio as AAC gives you a compact, widely-compatible audio file that plays natively on iOS, Android, and every modern device.
Extract audio from old camcorder AVI recordings
Early digital camcorders recorded video as AVI files. Extract the audio as AAC to listen to old recordings on modern devices, share via messaging apps, or archive in a current format.
Convert DivX AVI movie audio for streaming apps
DivX AVI videos from the early 2000s often have MP3 audio tracks. Converting to AAC updates the audio to a more efficient modern codec accepted by streaming and podcast platforms.
Create audio files from AVI training videos
Corporate training videos from the 2000s-2010s are often AVI files. Extract narration or lecture audio as AAC to create audio-only versions for employees who want to listen while multitasking.
Prepare AVI audio for podcast editing
Some podcast content was recorded as AVI video files in older workflows. Extract the audio as AAC to import into modern podcast editors like Audacity, GarageBand, or Adobe Audition for cleanup and publishing.
How to Convert AVI to AAC
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1
Upload your AVI file
Drag and drop your .avi file onto the converter or click to browse and select it. Files up to 500MB are supported.
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2
Server-side AAC encoding
Your AVI is uploaded over HTTPS and FFmpeg extracts and decodes the audio track, encoding it as AAC. The video stream is discarded. Processing completes in seconds.
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3
Download your AAC file
Click Download to save the .aac file. Both the original AVI and the converted AAC are automatically deleted from our servers after download.
Frequently Asked Questions
Most AVI files — especially DivX-era video rips — use MP3 audio. Home camcorder AVI files often use PCM (uncompressed) audio. Some AVI files from DVD rips use AC-3 (Dolby Digital). FFmpeg handles all of these when converting to AAC.
Yes. AAC is a more efficient codec than MP3. At equivalent bitrates, AAC delivers better audio quality, particularly at frequencies above 16 kHz. Converting AVI MP3 audio to AAC at a higher bitrate can improve perceived quality.
Yes. Converting between two lossy codecs (MP3 → AAC) involves re-encoding, adding a small additional quality reduction. At high bitrates (192+ kbps), this difference is typically imperceptible.
Yes. AAC is Apple's preferred audio format and plays natively on all iPhone, iPad, and Mac devices. AVI audio converted to AAC can be imported directly into the Music app or Files app on iOS.
FFmpeg uses a high variable bitrate setting by default, typically 192 kbps VBR AAC. This provides excellent quality for music, speech, and general content.
Yes. Android has supported AAC natively since version 1.0. AAC files play in the default media player and all major third-party apps on Android.
Yes. ChangeThisFile is completely free. No signup, no limits, no fees.
AAC produces better audio quality than MP3 at equivalent file sizes. For new audio files, AAC is generally the better choice. MP3 retains a compatibility advantage with very old devices that only support MP3.
Very fast — typically just a few seconds. FFmpeg only processes the audio stream; the video is discarded, making conversion much faster than full transcoding.
Yes. All uploads are HTTPS-encrypted and files are deleted from our servers after conversion. We never retain, access, or share your files.
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