MP4 to FLAC Converter

Extract audio from MP4 video files into a FLAC lossless container — perfect for archiving, audio restoration, and any workflow where you want a stable, editor-friendly format.

MP4FLAC

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MP4 (.mp4) · Max 20 MB

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What is MP4?

The most common video container format. Used by YouTube, smartphones, and cameras. Extract audio from any MP4 file instantly.

What is FLAC?

Lossless compression. Perfect quality at roughly half the size of WAV. The choice for audiophiles and archiving.

Why Convert MP4 to FLAC?

MP4 video usually carries AAC audio. AAC is lossy — converting it to FLAC will not magically make it lossless again. What FLAC does give you is a stable, future-proof container that every editor and archive tool reads. The decoded PCM from the MP4's AAC track is wrapped in FLAC's lossless compression, meaning no further generational quality loss. Use this when: you want to edit the audio in a DAW that doesn't open MP4 cleanly; you're archiving a one-of-a-kind recording (a livestream, an interview, a personal video) and want it in a format that won't degrade further; or you need to send the audio to a mastering engineer or post-production team who expects FLAC. Don't use this if file size is your priority — a FLAC of MP4 audio will be 5–10× larger than the source MP4. For mobile playback or sharing, MP3 or OGG is a better choice. For maximum quality preservation and editing flexibility, FLAC wins.

Who Uses This Converter

Audio archival

Store the audio from one-of-a-kind videos (interviews, recordings, livestreams) in a stable lossless container that won't degrade further.

DAW import

FLAC is widely supported in DAWs and audio editors that have spotty MP4 support. Convert once, import cleanly.

Mastering and post-production

Send the source audio to engineers as FLAC — the industry-standard lossless format for music handoffs.

Frequently Asked Questions

Is FLAC really lossless if the MP4 audio was lossy?

FLAC's compression is lossless — meaning the decoded output is bit-identical to the input PCM. But the input PCM came from a lossy AAC decode, so the audio quality is whatever the AAC was. FLAC freezes that quality without further loss; it doesn't restore what the AAC discarded.

How big will the FLAC file be?

Roughly 4–8× the size of the source MP4's audio track. A 5-minute video with 128 kbps AAC audio (about 5 MB of audio) becomes a 25–40 MB FLAC. Compression depends on the audio content — silence and tones compress well, dense full-band music less so.

Why not just keep the MP4?

If you can play the MP4 everywhere you need to, keep it. Convert to FLAC when you need DAW/editor compatibility, archive consolidation with a lossless library, or to hand off to professionals who expect FLAC or WAV.

Will metadata transfer?

Some metadata may transfer (title, artist if present in MP4 iTunes-style atoms), but MP4's metadata schema and FLAC's Vorbis comments don't map perfectly. For critical libraries, verify and edit tags in a tool like Mp3tag or MusicBrainz Picard after conversion.

What if my MP4 has multiple audio tracks?

Only the primary audio track is extracted. Multi-track exports (e.g., dubs in different languages, commentary tracks) require ffmpeg with track mapping.

Should I convert to WAV instead of FLAC?

WAV and FLAC are both lossless. FLAC is roughly half the size, supports metadata, and is preferred for music libraries. WAV is preferred for short edits, broadcast workflows, and tools that don't read FLAC. Pick FLAC unless you have a specific WAV requirement.