Convert AVI to FLAC Online Free
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Extract the audio from your AVI video file and save it as lossless FLAC. Ideal for archiving audio from older video collections, DivX rips, and legacy AVI media libraries.
By ChangeThisFile Team · Last updated: March 2026
ChangeThisFile extracts the audio from your AVI video file and encodes it as lossless FLAC using FFmpeg on our secure servers. FLAC preserves every detail of the source audio, ideal for archiving from older AVI media collections. Files are auto-deleted, free with no signup required.
AVI vs FLAC: Format Comparison
Key differences between the two formats
| Feature | AVI | FLAC |
|---|---|---|
| Type | Microsoft video container (audio + video) | Lossless audio-only format |
| Developer | Microsoft | Xiph.Org Foundation |
| Audio codec | MP3, PCM, or AC-3 (common) | FLAC lossless codec |
| File size | Moderate to large (includes video) | Moderate — lossless audio only |
| Audio quality | Depends on MP3 or PCM source | Bit-perfect reproduction of decoded audio |
| Compatibility | Windows-native, broad desktop support | Desktop players, HiFi devices, Plex, Kodi |
| Use case | Legacy video playback | Audiophile archiving, lossless music libraries |
When to Convert
Common scenarios where this conversion is useful
Archive audio from classic or legacy AVI video collections
AVI files from DVD rips, DivX-era videos, or older personal recordings often contain music or speech worth preserving. Convert to FLAC to archive the audio without further quality loss for long-term storage.
Extract PCM audio from lossless AVI recordings
Some AVI files contain uncompressed PCM audio tracks, especially from video capture cards. Extracting this to FLAC creates a smaller lossless audio file that retains every bit of the original recording quality.
Rescue audio from old DivX movie rips
DivX-era AVI files were popular in the early 2000s and many contain MP3 audio tracks for films and shows. Convert the audio to FLAC to create a stable lossless archive of the audio from these old collections.
Preserve audio from AVI home video recordings
Old camcorder or capture-card footage saved as AVI may contain irreplaceable personal audio. Extract as FLAC to create a lossless audio backup that can be easily stored, copied, and played decades from now.
Extract audio stems from AVI production footage
Older video production workflows used AVI extensively. Extract audio stems from AVI source footage as FLAC for lossless audio review, archiving, or import into a modern DAW.
Who Uses This Conversion
Tailored guidance for different workflows
Podcasters
- Pull the audio from a recorded AVI interview or webinar and publish it as a FLAC episode
- Convert a AVI livestream recording to FLAC so listeners can catch up on the go
Musicians & Producers
- Extract a performance take from a AVI video into FLAC to edit in your DAW
- Rip reference audio from a AVI clip to FLAC for sampling or transcription
Content Creators
- Convert a AVI recording to FLAC to reuse the soundtrack as background audio or a voiceover
- Turn a AVI talk into a FLAC audiogram or clip for social platforms
How to Convert AVI to FLAC
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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. The free tier accepts files up to 25MB; eligible paid browser access accepts up to 100MB.
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2
Server-side FLAC extraction
Your AVI is uploaded over HTTPS and FFmpeg extracts and decodes the audio track. PCM audio is re-wrapped losslessly; MP3 or AC-3 audio is decoded and encoded to FLAC without additional quality loss beyond the original codec.
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3
Download your FLAC file
Click Download to save the .flac file. The original AVI and converted FLAC are automatically deleted from our servers after download.
Developers: convert via API →
Frequently Asked Questions
AVI files commonly contain MP3 audio (especially DivX-era rips), uncompressed PCM audio (from video capture), or AC-3 (Dolby Digital) audio. FFmpeg detects and decodes whichever codec is present when converting to FLAC.
FLAC is a lossless container, meaning no further quality is lost during the conversion. However, if the AVI contained MP3 audio (which is lossy), the FLAC stores the MP3 audio losslessly — the quality ceiling is the original MP3.
Yes. If the AVI contains uncompressed PCM audio and you convert to FLAC, the result is perfectly lossless. FLAC compresses PCM data without any quality loss, producing a smaller file that perfectly reproduces the original audio.
FLAC removes the video stream and compresses only the audio. For a typical DivX AVI, the FLAC may be 5–20% the size of the original file. For an AVI with PCM audio, FLAC typically reduces audio data size by 40–60%.
FLAC is supported by VLC, Foobar2000, Kodi, Plex, Winamp, Android natively, and macOS/iOS since 2017. It is one of the most broadly supported audio formats on desktop and mobile platforms.
Yes. FLAC supports up to 8 channels. AC-3 5.1 surround audio from AVI files will be preserved as 5.1 FLAC. Most AVI files contain stereo audio only.
Yes. ChangeThisFile is completely free. No signup, no limits, and no fees.
Typically under 30 seconds for most videos. Only the audio stream is processed — the video is discarded, making conversion much faster than full video transcoding.
Yes. FLAC uses Vorbis comment tags supporting artist, album, title, track number, and embedded cover art. Metadata from the AVI container may partially transfer.
Yes. All uploads use HTTPS encryption and files are deleted from our servers immediately after conversion. We never retain or access your content.
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