This WCAG 2.1 and PDF/UA-1 validation interface is based on veraPDF model and implements the following validation profiles:
- PDF/UA-1 (Machine): PDF/UA-1 syntax checks based on the Matterhorn 1.02 Machine verifiable checkpoints.
- PDF/UA-1 (Human): prototype of several Matterhorn 1.02 Human verifiable tests based on heuristics of page layout recognition
- WCAG 2.1 (Extra): prototype of several WCAG 2.1 requirements that are not part of the PDF/UA-1 standard.
- WCAG 2.1 (All): combined profile including PDF/UA-1 (both Matterhorn and Human) and additional WCAG 2.1 requirements. This profile is used by default.
- Tagged PDF: the tagged PDF structure checks based on ISO 32000-1 and ISO 32000-2 requirements.
The source files of these validation profiles can be found at veraPDF GitHub.