Stop struggling with the
"black box" of PDF tagging.

Built by GrackleDocs, the trusted name in digital accessibility.

Grackle PDF is a remediation and validation tool designed to make PDF/UA compliance simple and fast. It brings standards-compliant tagging and repair directly into your workflow, eliminating the need for Adobe Acrobat.

Generate and validate complete tag trees for standard documents in under 30 seconds. 

Get Started with Grackle PDF

Ready to transform complex documents into compliant PDFs? Start remediating with guided workflows and automated fixes today.

  • Remediation made simple.

    Stop guessing at technical specifications. Our guided remediation workflow shows you exactly how to fix errors in real time with specialized Wizards for spaces, tables, and images.

  • Cut tag-tree work from hours to minutes.

    Automate the heavy lifting with smart auto-tagging and high-speed validation. Manage complex table spans, merges, and scoping in a dedicated interface built for speed.

  • Consolidate your tech stack and reduce overhead.

    Grackle PDF is a standalone solution for remediation workflows. Ensure enterprise-wide compliance with professional-grade validation and reliable performance.

Trusted by organizations across the globe making PDF accessibility simple and effective.

Built-in validation for the full Matterhorn Protocol to ensure every document meets rigorous technical accessibility standards.
Want to see how Grackle PDF transforms your workflow? Download the infosheet for a full feature breakdown.
• Guided Remediation
• Advanced Table Management
• Automated Fixes
• Wizards for Simplified Editing
• No need for Adobe Acrobat
Access the Infosheet
Image of the Grackle PDF info sheet.

Who is Grackle PDF for?

  • Content Creators

    Creators & authors who want guided remediation.
    Designed for content creators and authors who need to produce accessible PDFs as part of their daily routine without becoming experts in PDF/UA specifications.
    • Step-by-step guidance to correct issues in real time.
    • Specialized Wizards for spaces, tables, and images.
    • Transform complex documents without deep technical expertise.
  • Remediation Specialists

    Specialists building accessibility into the PDF workflow.
    Built for specialists who need to manage intricate layouts and large document batches with precision and speed.
    • Tag tree generation in under 30 seconds for standard documents.
    • Advanced tools to adjust table structures, spans, merges, and scoping.
    • Deploy AI-assisted fixes to resolve common tagging errors instantly.
  • Compliance Professionals

    Compliance officers managing organizational risk.
    Created for professionals who need to ensure that every digital asset meets strict legal and ethical standards. Grackle PDF provides the verified reporting and standards-based validation needed to mitigate risk across the entire organization.
    • Verify compliance with the Full Matterhorn Protocol.

    • Mitigate legal and accessibility risk across all departments.

    • Streamline oversight with professional-grade validation reports.

Professional tools for universal usability.

Everything you need to validate, repair, and comply.
  • Automated Tag Tree Generation

    Accelerate your workflow with high-speed automated tagging. Grackle PDF generates and validates complete tag trees for standard documents (under 20 pages) in less than 30 seconds, eliminating manual labor.

  • Advanced Table Management

    Easily adjust table structures, spans, merges, and scoping within a dedicated interface built for speed.

  • Intelligent Alt-Text Management

    Utilize the dedicated Image Wizard to inventory every graphic in your document. Easily flag missing descriptions and apply professional-grade alt-text to ensure your visual content is fully accessible to screen reader users.

  • Streamlined Compliance

    Instantly verify your document against the Full Matterhorn Protocol without leaving the application. Our integrated validator ensures every tag, table, and metadata field meets PDF/UA and WCAG technical standards.

  • Specialized Wizards for Simplified Editing

    Utilize specialized tools including the Space Wizard, Table Wizard, and Image Wizard to optimize document structures efficiently.

  • AI-Enhanced Workflows

    Accelerate your repair process with intelligent, context-aware tools that handle repetitive manual tasks. From automated fixes to guided remediation paths, our AI-enhanced features reduce manual tag adjustments so you can deliver compliant files faster.

Frequently Asked Questions

  • Is Grackle PDF a desktop application or a web-based tool?

    Grackle PDF is a dedicated Windows desktop application. It provides a high-performance environment designed for heavy-duty remediation, ensuring you have the processing power needed to handle complex tag trees and large document batches without the lag of a browser-based interface.

  • Do I still need an Adobe Acrobat license to use Grackle PDF?

    No. Grackle PDF is a standalone solution designed to eliminate the need for Adobe Acrobat licenses for accessibility remediation workflows. It provides a more streamlined, user-friendly experience for complex tagging and table management in one package.

  • Does it support the full Matterhorn Protocol for validation?

    Yes. Grackle PDF includes built-in validation using the Full Matterhorn Protocol to ensure comprehensive compliance with PDF/UA standards.

  • Does Grackle PDF support batch processing?

    Grackle PDF is designed to accelerate the workflow of remediation specialists, allowing you to move through complex document batches with AI-powered auto-tagging and guided wizards. If your organization requires fully automated, high-volume batch processing for millions of repetitive documents (like statements or notices), we recommend Grackle Stream, our enterprise-scale automation engine.

    Can Grackle PDF handle scanned PDFs?

    High-quality remediation starts with searchable text. Grackle PDF is designed to work with documents that have already undergone Optical Character Recognition (OCR). Once your text is searchable, Grackle PDF provides the professional-grade wizards and auto-tagging tools needed to turn that “flat” text into a fully compliant, structured PDF/UA document. 

    Why should I choose Grackle PDF over other auto-tagging or remediation tools?

    Most tools force you to choose between “fast but inaccurate” automation or “accurate but painful” manual editing. Grackle PDF bridges that gap. We combine a high-speed automated tagging engine with a professional-grade remediation environment designed (and used daily) by the world’s leading accessibility experts. While others offer a “magic button” that often leaves structural errors behind, we provide a guided, precision-focused workflow that ensures every tag, table, and metadata field meets the rigorous full Matterhorn Protocol. 

    How can I get started or see a demo for my team?

    Because every organization’s document volume and compliance requirements are unique, we offer tailored walkthroughs to show you how Grackle PDF fits your specific workflow. Fill out the Inquiry form below to schedule a demo and discuss licensing options for your team.

Built by accessibility experts. Built to last.

Full PDF/UA Compliance • Built-in Matterhorn Protocol Validation • No Acrobat Required
  • Professional-Level Remediation at Your Fingertips

    Gain access to the same high-performance environment used by accessibility experts to handle complex tag trees and large document batches. Grackle PDF puts powerful, standards-compliant tools directly on your desktop, giving your team the precision and speed required for professional-grade results.

  • PDF/UA Compliant by Design

    Specifically designed to bring standards-compliant tagging, validation, and repair directly into the PDF workflow. By integrating the full Matterhorn Protocol, Grackle PDF ensures that even the most complex documents meet the technical requirements of international accessibility mandates with precision.

  • The Engine Behind Millions of Compliant Pages

    Grackle PDF isn’t just a tool we sell, it’s the tool we use. Our own internal team has relied on this technology to deliver professional white-glove remediation services for millions of pages over the last 10 years. When you use Grackle PDF, you are using a platform refined by a decade of real-world, high-volume compliance experience.

Trusted by teams in

  • Government
  • Education
  • Enterprise
  • Healthcare
  • Financial Services

Achieve PDF/UA compliance in seconds.

Eliminate the complexity of PDF tagging. Professional-grade results for every document author.
Available for Windows · Supports files up to 50 MB

Need More Than Remediation Tools?

GrackleDocs offers comprehensive support and services for organizations needing to meet complex accessibility mandates.