Convert MP4 to FLAC Online Free
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Extract the audio track from your MP4 video and save it as lossless FLAC. Perfect for archiving concert recordings, preserving audio quality, or creating high-fidelity audio files.
By ChangeThisFile Team · Last updated: March 2026
ChangeThisFile extracts the audio track from your MP4 video and encodes it as lossless FLAC using FFmpeg on our secure servers. FLAC preserves every detail of the original audio with zero quality loss. Files are auto-deleted after conversion, completely free with no signup needed.
MP4 vs FLAC: Format Comparison
Key differences between the two formats
| Feature | MP4 | FLAC |
|---|---|---|
| Type | Video container (audio + video) | Lossless audio-only format |
| Compression | H.264/H.265 video + AAC/MP3 audio | Lossless compression (no quality loss) |
| File size | Large (video stream dominates) | Moderate — smaller than WAV, larger than MP3 |
| Audio quality | Dependent on encoded audio stream | Perfect bit-for-bit reproduction of source |
| Compatibility | Universal video players | HiFi players, Plex, Kodi, Foobar2000, Linux |
| Metadata | Title, chapters, subtitles | Vorbis comments: artist, album, track, cover |
| Use case | Video sharing and streaming | Audiophile archiving, lossless music libraries |
| Streaming | Widely streamed online | Supported by Tidal, Qobuz, some local players |
When to Convert
Common scenarios where this conversion is useful
Archive concert or live performance recordings
Convert MP4 concert videos to FLAC to preserve the full audio fidelity of live performances. FLAC compression is lossless, so no audio detail is discarded — ideal for archiving recordings you care about.
Build a lossless music library from video sources
If you have music videos or live session MP4s, extracting to FLAC lets you add them to a lossless music library managed by tools like Plex, Kodi, or Foobar2000 with full metadata support.
Prepare audio for professional editing
Extract audio from MP4 footage as FLAC before importing into a DAW like Audacity or Reaper. Lossless source files ensure no generation loss when you re-export after editing.
Preserve film or documentary soundtracks
Extract dialogue, sound design, or score from MP4 documentary or film files as lossless FLAC for archival purposes or further audio post-production work.
Create high-quality audio for audiophile playback devices
Many portable HiFi players and network streamers natively support FLAC. Extract your MP4 audio to FLAC to enjoy it on devices like a FiiO player or Sonos speaker at full quality.
Who Uses This Conversion
Tailored guidance for different workflows
Podcasters
- Pull the audio from a recorded MP4 interview or webinar and publish it as a FLAC episode
- Convert a MP4 livestream recording to FLAC so listeners can catch up on the go
Musicians & Producers
- Extract a performance take from a MP4 video into FLAC to edit in your DAW
- Rip reference audio from a MP4 clip to FLAC for sampling or transcription
Content Creators
- Convert a MP4 recording to FLAC to reuse the soundtrack as background audio or a voiceover
- Turn a MP4 talk into a FLAC audiogram or clip for social platforms
How to Convert MP4 to FLAC
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1
Upload your MP4 file
Drag and drop your .mp4 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 lossless audio extraction
Your MP4 is securely uploaded and FFmpeg extracts the audio track, encoding it as lossless FLAC. The video stream is discarded entirely. Processing typically completes in seconds.
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3
Download the FLAC file
Click Download to save your .flac file. Both the original MP4 and the converted FLAC are automatically deleted from our servers after you download.
Developers: convert via API →
Frequently Asked Questions
FLAC itself is a lossless codec, so the FLAC file is a perfect copy of the audio data fed into it. However, the audio in your MP4 is usually AAC or MP3, which are already lossy. Converting lossy-encoded audio to FLAC does not recover lost quality — it simply stores the existing audio losslessly without further degradation.
FLAC preserves audio without any additional encoding loss, making it ideal for archiving, further audio editing, or playback on high-quality speakers and headphones where subtle differences are audible. MP3 adds another round of lossy compression on top of the existing audio.
FLAC extracts only the audio stream and compresses it losslessly, typically achieving 40–60% compression over raw audio. The result is much smaller than the original MP4 (which includes the video stream), but larger than an equivalent MP3.
Most MP4 files contain AAC audio, though some use MP3 or AC-3 (Dolby). FFmpeg decodes whichever codec is present and re-encodes it to FLAC during extraction.
Yes. FLAC uses Vorbis comment tags that support artist, album, title, track number, and embedded cover art. Metadata from the MP4 container may carry over, and you can edit tags afterward using tools like MusicBrainz Picard or Mp3tag.
Yes. FLAC supports multi-channel audio including 5.1 and 7.1 surround. If your MP4 contains a multi-channel audio track, FFmpeg will encode it to FLAC preserving all channels.
Yes. ChangeThisFile is completely free with no signup, no watermarks, and no conversion limits. Just upload and download.
FLAC is supported natively on Android, Linux, and by most media players including VLC, Foobar2000, Kodi, Plex, Winamp, and streaming services like Tidal and Qobuz. iOS and macOS support FLAC in recent versions.
Audio-only extraction from MP4 to FLAC is fast. A typical 60-minute video converts in under 30 seconds because FFmpeg only needs to decode and re-encode the audio stream, not the video.
Yes. Files are transferred over HTTPS and deleted automatically from our servers immediately after conversion. We do not store, share, or access your files.
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