What's the FLAC equivalent of ID3's USLT and SYLT?

There isn't a formal one. FLAC stores metadata as Vorbis comments — flat UTF-8 KEY=value strings — and the Vorbis spec never defined a lyrics field. LYRICS (timestamped) and UNSYNCEDLYRICS (plain) are the names that emerged in practice, so those are what we write.

I embedded plain text and the file still shows synced lyrics. Why?

Plain mode writes UNSYNCEDLYRICS and deliberately leaves any existing LYRICS field alone, because deleting a synced lyric you didn't ask us to touch is not recoverable. If you want the old synced text gone, embed a new LRC over it, or clear the field in a desktop tagger.

What happens to my other tags and the cover art?

Nothing. TITLE, ARTIST, ALBUM, DATE and the embedded PICTURE block are untouched — we only set the two lyric fields.

My FLAC has multiple artists tagged. Do they survive?

Yes. Vorbis comments are multi-valued, and we only assign the lyric fields, so an ARTIST list with two or three entries is left exactly as it was.

Is there a size limit?

100 MB per file, which covers most single tracks but not a whole-album FLAC rip. The endpoint also allows 30 uploads a minute from one IP address.

What about MP3 files?

Use Embed Lyrics MP3. MP3 uses ID3 frames, not Vorbis comments — a different container with a different lyrics model, including a genuine synced-lyric frame type.

Embed lyrics into FLAC

Bake lyrics into your FLAC files

Write plain or LRC-synced lyrics into a FLAC's Vorbis comment block. FLAC has no SYLT equivalent, so an LRC is stored as its own text in a LYRICS field — the convention taggers and audiophile players actually look for.

Input

FLAC + lyrics text/LRC

Up to 100 MB

Output

Tagged FLAC

LYRICS / UNSYNCEDLYRICS fields

Vorbis commentsLYRICS + UNSYNCEDLYRICSFree · no account

Embed lyrics

Uploads are deleted automatically
Auto-detects LRC vs plain text

Embed lyrics

Step 1 — FLAC file

Choose FLAC File

Drag and drop, or press Enter to browse

or drop your file here

FLAC · max 100 MB

Step 2 — lyrics format

Step 3 — lyrics

0 lines · 0 characters

See it in action

FLAC in, FLAC with Vorbis lyrics out

FLAC + LRC

What you provide

🎵 hotel_california.flac   (6:30, 41 MB)

[ti:Hotel California]
[ar:Eagles]
[00:54.20]On a dark desert highway
[00:58.40]Cool wind in my hair

hotel_california_with_lyrics.flac

What you receive

🎵 hotel_california_with_lyrics.flac

Vorbis comments written:
  LYRICS          [00:54.20]On a dark…
                  [00:58.40]Cool wind…
  UNSYNCEDLYRICS  On a dark desert highway
                  Cool wind in my hair

Left untouched:
  TITLE · ARTIST · ALBUM · PICTURE
  FLAC audio frames — bit-identical

Step-by-step guide

How to use this tool

01
Upload a FLAC
Up to 100 MB. Your local file is never modified — we tag a server-side copy and return it as a download.
02
Paste your lyrics
Plain text or LRC. In LRC mode the timestamped text is stored verbatim, character for character, so a player that parses it gets exactly what you pasted.
03
Pick mode
Plain Text writes UNSYNCEDLYRICS. LRC writes LYRICS with the full timestamped text, plus UNSYNCEDLYRICS holding the same lines with the timestamps removed.
04
Download the tagged FLAC
Named after your file with _with_lyrics added, so the original stays where it is.

Key features

Why use this tool

The fields taggers agree on

Vorbis comments have no registered lyrics field — LYRICS and UNSYNCEDLYRICS are the de facto names that foobar2000, MusicBee and most tagging tools read and write. We use those two rather than inventing our own.

Text, not a binary frame

ID3 packs synced lyrics into a SYLT structure of sync points. A Vorbis comment is just KEY=value UTF-8 text, so your LRC survives round-tripping through any tagger without being re-encoded into someone else's timing format.

Stays lossless

Only the metadata block is rewritten. The FLAC audio frames are byte-identical to the file you uploaded — this is a tag edit, not a re-encode.

UTF-8 throughout

Vorbis comments are UTF-8 by specification, so there is no encoding to pick and no mojibake risk for Japanese, Cyrillic or Devanagari lyrics.

Common use cases

Who this tool is for

Lossless libraries

Keep the lyrics inside the FLAC so a re-rip or a move between servers doesn't orphan a sidecar .lrc.

Audiophile playback

Feed a hardware streamer or a foobar2000 setup that reads the LYRICS field directly off the file.

Pre-transcode master

Tag the FLAC once; a later transcode to MP3 or Opus carries the text forward in most conversion tools.

Questions answered

Frequently asked questions

Yes. We only rewrite the Vorbis comment block — the encoded audio frames are byte-identical to your upload, so decoding the output gives back exactly the same samples.