Add Cover Art to FLAC

What is a FLAC PICTURE block?

When you add cover art to FLAC, the artwork is not stored the same way as text tags like title or artist. FLAC keeps its text metadata in a Vorbis comment block, but artwork lives in a separate structure called a PICTURE block, a distinct metadata block defined specifically for embedded images, with its own fields for picture type, MIME type, dimensions, and the image data itself.

This distinction matters in practice. A tool that only understands Vorbis comments can read or write your FLAC's title and artist just fine while completely ignoring, or mishandling, the artwork sitting in its own PICTURE block. This tool reads and writes PICTURE blocks directly, which is why it can show you existing artwork, replace it, or strip it out cleanly.

Picture types: front cover, back cover, artist, and other

The FLAC PICTURE format supports labeling artwork by picture type, and this tool exposes four practical options: front cover, back cover, artist, and other. Front cover is what nearly every music player displays by default and is the right choice for the main album art almost all of the time.

What size and format should FLAC cover art be?

There is no single format that every player enforces, but a square JPEG somewhere in the 500 to 1400 pixel range is a practical, widely compatible choice: sharp enough to look good in a player's full-screen artwork view, without adding much to the file size. This tool accepts JPEG and PNG, validates the file, and reads its dimensions so you can see what you are embedding before you save.

PNG is fine for artwork with sharp edges or text, but a very large, high-resolution PNG can noticeably bloat a FLAC file, since the image is stored uncompressed relative to a similarly sized JPEG. If file size matters and your artwork is a photo, a JPEG at a reasonable size and quality will usually look just as good embedded while taking up a fraction of the space.

Why does this keep the audio byte-for-byte identical?

This editor is pure JavaScript, not FFmpeg, and it never decodes or re-encodes the audio. A FLAC file's metadata blocks, including the PICTURE block and Vorbis comments, sit in a header area before the actual compressed audio frames. Adding, replacing, or removing artwork only rewrites that header area, so the audio frames that follow are copied through untouched.

In practical terms, this means embedding cover art on a FLAC file has zero effect on its audio quality, and the change is fully reversible: remove the artwork later and you are back to the same audio, still byte-for-byte identical to the version before you ever added a picture. It also means large FLAC files are not slow to tag; the tool never has to read through, decode, or re-render the audio stream just to update a picture or a text field.

Extracting and removing artwork

If a FLAC file already has embedded art you want to reuse elsewhere, extract existing artwork to save it as a standalone image file rather than taking a screenshot of a player's now-playing view.

To strip artwork entirely, for example before sharing a file where you do not want any embedded image, remove all artwork in a single step. This clears the PICTURE block without touching your text tags or the audio.

Editing tags beyond the artwork

Alongside artwork, this tool edits basic Vorbis comment tags such as title and artist, so you can tidy up a file's basic information in the same pass as adding a cover image. For deeper tag editing across more fields, or for tagging non-FLAC files like MP3 and M4A, the audio metadata editor is the more general tool; this page stays focused on FLAC artwork specifically, which is where most FLAC tagging questions actually come from.

Guides for this tool