Nutrient DWS Accessibility API vs PAVE 2.0

Nutrient DWS Accessibility API processes PDFs to add accessibility tags and check conformance. It returns a tagged PDF with PDF/UA metadata and targets PDF/UA-1 (ISO 14289-1). Tagging covers H1–H6 headings, ordered and unordered lists, table rows and cells, reading order, annotations and decorative artifacts. The API accepts HTTP requests from any programming language, with quickstarts for Java, C#, JavaScript, Python and PHP. Nutrient reports 96.5% PDF/UA conformance across a validation corpus of 3,157 files. Its free plan costs nothing and includes 20 auto-tagged pages and 100 validations per month. Starter costs $79 a month for 200 pages and 1,000 validations; Professional is $249 a month for 1,000 pages and 5,000 validations; Business is $499 a month for 3,000 pages and 15,000 validations. Monthly quotas do not roll over, and requests in a quota category are blocked when that quota runs out unless a larger plan or pay-as-you-go is used. Auto-tagging does not guarantee full accessibility compliance, so Nutrient recommends QA, especially for sensitive or high-stakes documents.

PAVE 2.0 is a free, web-based, AI-powered tool for remediating PDF documents. Developed by the ICT Accessibility Lab at the ZHAW Institute of Computer Science, it guides users through an eight-step workflow. Users can group and adjust regions such as paragraphs, headings, figures, tables, formulas, and captions. They can set the reading order of page regions for screen readers, organize heading levels, and define table and list structures. The tool supports adding or editing alternative text for figures and mathematical formulas. A final check lets users review results and add metadata; the page states that an accessible PDF needs at least a title, author, and language. PAVE 2.0 lists PDF tagging, reading-order, alternative-text tools, and PDF/UA support. It is not suitable for confidential information, particularly sensitive personal data involving health, political, religious, or ethnic origin. The tool warns that editing may change PDF content or presentation, leaving users responsible for reviewing generated files. ZHAW states that it assumes no liability for generated PDFs.