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Lossless container

YouTube to FLAC

AudioFetcher can output FLAC, but you should know what that means. YouTube's audio is lossy Opus or AAC, so a FLAC file is an exact, uncompressed copy of that source, not a lossless master. It is useful for editing and archiving without further loss, not for gaining quality.

Open the converter Limits and help
Exact copyNo further loss after YouTube's own encode.
For editingCut and process without stacking encodes.
Not upscalingCannot restore what YouTube removed.

How FLAC conversion works

The server decodes YouTube's Opus or AAC stream to PCM and stores it in FLAC, which compresses without loss. Everything that was in the YouTube stream is kept; nothing that was removed by YouTube's encoder comes back.

  1. 1
    Paste the video link

    Any single public video.

  2. 2
    Choose FLAC as the format

    The hint explains that the source is lossy. Chapter embedding is unavailable for FLAC, so use Split chapters if you need tracks.

  3. 3
    Fetch

    FLAC files are larger and take longer to prepare than MP3, since the temporary output is uncompressed PCM.

  4. 4
    Save and, if you like, convert to ALAC

    Apple devices prefer ALAC. The local FLAC to ALAC tool converts losslessly in your browser.

When FLAC is the right choice: you plan to edit, trim, normalize or remix the audio and want to avoid a second lossy encode; you keep an archive and want the closest copy to the source; your workflow standardizes on FLAC. When it is not: you just want to listen, in which case Opus or M4A gives the same quality at a fraction of the size. Free FLAC covers single videos up to 60 minutes. Pro caps FLAC at two hours and 2 GiB per item. Use only videos you own or have permission to download.

Questions

Is YouTube to FLAC lossless?

The FLAC step is lossless. The audio inside is still YouTube's lossy stream. Some communities reject such files as fake lossless, and they are right that no quality is gained.

Why is the FLAC file so large compared to the Opus?

Because FLAC stores the decoded audio. A 5 minute video is roughly 5 MB as Opus and 25 to 35 MB as FLAC with identical content.

Why not just keep Opus for editing?

You can. Editors that import Opus will decode it themselves. FLAC is useful when your editor or archive tool does not handle Opus.

Can I get chapters in FLAC?

FLAC does not have broadly compatible embedded chapter markers, so AudioFetcher offers Split chapters for FLAC instead.

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