Remove Leonardo.AI metadata from PNG

Leonardo.AI saves the prompt, the model name (PhotoReal, Anime XL, Flux Schnell, etc.), the generation_id, and a Leonardo brand reference in PNG tEXt chunks of every download. The generation_id ties the image back to your Leonardo account and is queryable via their public gallery if your image was set to public. GhostMeta drops every text chunk via canvas re-encode and the file becomes neutral. Unlike a signed C2PA manifest, Leonardo's PNG tEXt and iTXt chunks are plain readable text — any free PNG inspector dumps the prompt, model name and generation_id without decoding anything. That matters for print-on-demand and stock-marketplace delivery: when you hand a client or a Redbubble/Etsy reviewer the raw download, your full prompt and the Leonardo brand string travel inside the file and can be read in one click. GhostMeta decodes the PNG to a canvas and re-encodes it, dropping every text chunk while keeping the original pixels and the alpha channel intact, so transparent backgrounds survive the clean-up.

FAQ

Can someone find my prompt from generation_id?

If your generation was public on Leonardo, yes — the ID is enough to look up the original prompt and parameters via Leonardo's gallery.

Does Alchemy or PhotoReal embed extra fields?

Yes, Alchemy preset writes the upscale model and noise level. PhotoReal writes the photorealism strength. All flow through the same tEXt chunk and are stripped together.

What about API-generated Leonardo images?

API outputs carry the same metadata as the web UI. Strip them the same way.

Where exactly in the PNG does Leonardo store this data?

Leonardo writes it into PNG ancillary text chunks — tEXt for plain ASCII keys and iTXt for UTF-8 or compressed values — usually placed between the IHDR header and the IDAT image data. Typical keys hold the prompt, the model name and the generation_id. GhostMeta does not edit those chunks in place: it rebuilds the PNG from the canvas, so every tEXt and iTXt chunk is gone in the output.

If I downloaded a whole batch as a ZIP, do I clean each one?

Yes. Leonardo's batch and ZIP exports embed the same tEXt chunks in every PNG inside the archive, including the upscaled and varied versions. Unzip first, then run each image through GhostMeta — there is no shared sidecar to clean, the metadata lives inside each individual file.

Does Leonardo add a C2PA manifest like DALL-E or Firefly?

As of now Leonardo's standard PNG downloads rely on plaintext tEXt/iTXt chunks rather than a signed C2PA caBX chunk, so there is no cryptographic provenance to read — just readable text. GhostMeta strips these chunks the same way regardless; if a future export ever adds a caBX C2PA chunk, the canvas re-encode drops that too.