15 Best PDF Tagging Tools
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PREP
PREP by Continual Engine is an AI‑powered PDF remediation solution that transforms untagged or poorly tagged documents into fully accessible, standards‑compliant outputs with remarkable speed and precision. It uses advanced machine learning to auto-tag over 90% of the document, handling complex layouts, tables, and forms. Its intuitive dashboard provides real‑time compliance reporting, supports accessibility standards, such as WCAG, ADA Title II requirements, and PDF/UA standards, and enables bulk processing of tagged PDF files with one click.
Adobe Acrobat Pro
Adobe Acrobat Pro is a longstanding leader in PDF management, offering built‑in accessibility features alongside editing capabilities. With this tool, you can add tags, alternative text, bookmarks, and more. Its Accessibility Checker flags issues and suggests fixes to help you automate remediation.
Equidox
Equidox is a fully automated AI‑driven tool designed to automate remediation for high‑volume, templated documents. Its machine learning and computer vision models instantly detect document structure with just a few clicks. You can batch‑process or run on‑demand via API, generating fully tagged outputs that conform to WCAG, PDF/UA, and Section 508 standards.
CommonLook PDF
CommonLook PDF is a premier solution designed specifically for enterprise‑grade accessibility compliance. This tool validates and remediates against WCAG, PDF/UA, and Section 508 standards to ensure your documents stay compliant with laws like ADA Title II, EAA, and others.
Axes4
Axes4 is a time‑saving add‑on for transforming PDFs into fully accessible documents. This fully automated service simplifies the remediation process by transferring document semantics, like headings, lists, images, and tables, into PDF tags in a fully automatic workflow. It ensures compliance with PDF/UA, WCAG 2.1, and Section 508.
PDFix
With its auto‑tagging engine, PDFix recognizes document structure, tags headings, lists, and tables, and generates fully tagged PDF outputs. Its SDK allows integration into custom or large‑scale batch workflows, giving PDF files that are compliant with PDF/UA and WCAG standards.
DocAXESS
DocAXESS provides a browser‑based tool that automates the remediation of core structural elements and reading order. You can structure and tag your document to make it readable and accessible to everyone, including users with disabilities. With this tool, you can get your images, texts, tables, and diagrams to meet the PDF/UA standard (ISO 1489-1) requirements.
GrackleDocs
This full-service accessibility provider can simplify the tagging process by converting existing PDF documents into accessible formats. It adds the necessary structure and tags required for proper interpretation of information on screen readers and other assistive devices.
PAVE
PAVE is an open‑source tool that audits PDFs for missing or incorrect tags and reading order issues. While it doesn't auto‑tag, it provides clear, prioritized guidance so teams can manually apply fixes and produce compliant PDF outputs.
Venngage
Venngage is primarily a design tool, but its PDF export includes basic tagging features. With templates optimized for accessibility, the tool automatically applies alt text and semantic markup. While less comprehensive than dedicated tools, it is a good pick if you want to quickly generate simple, accessible infographics and reports.
Crawford Technologies
Crawford Technologies has an AI‑powered tagging tool called AccessibilityNow that can automate the process of tagging documents at an enterprise scale. Their Auto Tagger engine can batch‑process PDF libraries, delivering fully standards‑compliant tagged PDF files (PDF/UA, WCAG).
DocHub
DocHub provides an online editor that lets users add tags to PDF files manually through an intuitive interface. While it does not offer automated remediation, it allows users to edit, annotate, and apply tagged PDF adjustments directly within the editor. It's ideal for quick manual updates and tagging needs, especially for individuals looking for a no-installation solution.
EqualWeb
EqualWeb uses AI-powered automation for tagging inaccessible documents. It automatically adds structure tags for headings, paragraphs, lists, tables, and more, ensuring a fully tagged PDF output. The tool also implements language tagging per paragraph, improves reading order, and supports reflow on mobile devices.
AccessiBe
AccessiBe offers professional file remediation services that combine AI automation with expert manual review to ensure compliance and usability for all users, including those relying on assistive technologies. With this hybrid approach to tagging, the tool ensures that your documents are machine-processed and manually perfected for accuracy. Their service supports PDFs, Microsoft Office documents, and multi-language content, making them a scalable choice for businesses across sectors.
Damco
Damco delivers enterprise-grade document accessibility services, combining AI automation with expert manual workflows to produce fully tagged PDF files compliant with Section 508, ADA, and international standards like WCAG and DDA. Their service covers everything from alt text and reading order to tables, forms, metadata, language tags, and bookmarks.
