You cannot get true, lossless FLAC audio from YouTube. YouTube does not store or stream lossless audio. All YouTube audio is lossy (compressed). Converting a YouTube video to .flac simply creates a larger file container containing the same low-quality lossy audio.
Let’s walk through the easiest method for beginners using yt-dlp (which is free and safe).
Step 1: Install yt-dlp
Step 2: Install FFmpeg (necessary for audio conversion)
Step 3: Download and Convert Open command prompt/terminal: yt flac
yt-dlp -f bestaudio --extract-audio --audio-format flac https://www.youtube.com/watch?v=EXAMPLE
Step 4: Verify your file
Download Spek (free, open-source). Drag your new .flac file into Spek. Look for the frequency cutoff.
Step 5: Tag your FLAC Use MusicBrainz Picard or Mp3tag to automatically fetch album art, artist name, and track number. This transforms your raw file into a library-ready asset. You cannot get true, lossless FLAC audio from YouTube
If you still need to convert YouTube audio to FLAC for legitimate archival purposes, you need software that downloads the actual audio stream without re-compressing it badly. Avoid online "YouTube to FLAC" websites (they are often malware traps or limit file sizes).
Here are the professional, open-source tools used by the community: Step 2: Install FFmpeg (necessary for audio conversion)
This is the gray area. YouTube’s Terms of Service explicitly forbid downloading videos or audio unless a download button is visibly provided by YouTube (YouTube Premium allows offline viewing within the app, not permanent FLAC files).