Labs
Image formats
Container rules first. A JPEG APP1 block is not the same thing as a PNG eXIf chunk or a HEIC item property.
What metadata does a JPEG file contain?
A JPEG can hold EXIF (including GPS), XMP, ICC, and in some files C2PA in APP11/JUMBF. This page does not yet publish a dated sample dump; it exists so the format facts stay separate from platform folklore.
Test pendingWhat metadata does a PNG file contain?
PNG is not “metadata-free by default.” It can carry eXIf, textual chunks (sometimes prompts), pHYs, and in some files a C2PA `caBX` chunk. No dated sample dump is attached yet.
Test pendingWhat metadata does a HEIC file contain?
iPhone stills are often HEIC. The container can hold EXIF-equivalent item properties, including location, independently of a JPEG sitting next to it. No dated CPK dump is attached yet.
Test pendingWhat metadata does a WebP file contain?
WebP can carry EXIF, XMP and ICC chunks. A conversion to WebP is not automatically a metadata strip. No dated sample dump is attached yet.