PNG stores metadata as named chunks — four-letter type codes followed by length-prefixed data. Most metadata tools only recognize a short list (tEXt, iTXt, eXIf). AiEraser flags any chunk that isn't a known pixel-critical type, which is how it correctly catches caBX — the chunk C2PA uses to embed AI content-credential manifests in PNG files — something we found several basic tools silently skip entirely.
PNG is the default export format for many AI image tools. If a scanner only checks the classic chunk types, a PNG carrying a full C2PA manifest in caBX can come back as "no metadata found" — which is precisely wrong. AiEraser's View mode decodes the actual manifest contents (claim generator, actions, signature) rather than just flagging that something unrecognized exists.
Remove mode re-encodes the PNG through canvas — losslessly, since PNG is already a lossless format — dropping every chunk except the pixel data itself.
Try it now — drop a PNG in and see every chunk it actually contains.