PDF Tagged Content Viewer
Inspect the complete logical structure tree of any tagged PDF. The pdf tagged content viewer renders the full tag hierarchy - headings, paragraphs, tables, figures, and links - as a collapsible tree, flags figures missing alt text, and shows the exact reading order that screen readers will follow.
Tag Legend
Upload a tagged PDF to enable inspection
Upload a tagged PDF to view its structure tree
Why Use Our PDF Tagged Content Viewer?
Full Tag Tree Inspection
The pdf tagged content viewer renders the complete logical structure tree of your PDF - Document, Part, Sect, Article, P, H1-H6, Table, Figure, Link, and Span - in a collapsible hierarchy exactly as screen readers traverse it.
Alt Text & Role Visibility
See the Alt, ActualText, and Title attributes attached to each tag node at a glance. Identify figures and images that are missing alternative text descriptions required by WCAG 2.1 and PDF/UA.
100% Private - Runs in Your Browser
All tag tree extraction runs locally in your browser using client-side JavaScript. Your PDF never leaves your device, keeping confidential documents completely secure.
Instant Results, No Sign-Up
Upload any tagged PDF and view the complete structure tree in seconds - no account required, no file size limit, and completely free to use as many times as you need.
Common Use Cases for PDF Tagged Content Viewer
WCAG & PDF/UA Compliance Audits
Verify that a PDF document has a complete and correctly structured tag tree before submitting it for WCAG 2.1 or PDF/UA (ISO 14289) accessibility compliance review.
Screen Reader Testing
Understand the exact reading order a screen reader will follow through a document - identify heading hierarchy gaps, out-of-order sections, and missing figure descriptions.
Government & Public Sector Documents
Check that public-facing PDFs meet accessibility legislation requirements (e.g., Section 508 in the US, EN 301 549 in the EU) before publishing them on official websites.
Accessible Publishing Workflows
Inspect exported PDFs from InDesign, Word, or Acrobat to confirm that the tag structure, reading order, and heading levels survived the export process intact.
Alt Text Auditing
Quickly identify all Figure and Image tags across every page and check which ones are missing Alt or ActualText attributes - essential for screen reader accessibility.
Legal & Procurement Accessibility Checks
Validate vendor-supplied PDFs before procurement sign-off. Confirm that contracts, reports, and technical documents meet accessibility standards required by your organisation.
Understanding PDF Tagged Structure
What is PDF Tagged Content?
A tagged PDF is a document that contains a hidden logical structure tree alongside its visual content. This tree defines the semantic meaning and reading order of every element: headings, paragraphs, lists, tables, figures, and links are all represented as named tag nodes (e.g., <H1>, <P>, <Table>, <Figure>). Screen readers, braille displays, and reflow engines use this tree - not the visual layout - to present the document to users with disabilities. Without tags, a PDF is effectively inaccessible because assistive technology cannot determine the correct reading order or semantic structure of the page content.
How Our PDF Tagged Content Viewer Works
- Upload: Drop your PDF into the tool. The structure tree is extracted from the PDF's
/MarkInfoand/StructTreeRootentries using pdfjs-dist, running entirely in your browser. - Parse: The viewer traverses the structure tree recursively, collecting tag type, role, Alt text, ActualText, Title attributes, and page number for each node.
- Inspect: The complete tag hierarchy is displayed as a collapsible tree. Each node shows its tag name, any associated attributes, and the page it belongs to. Nodes with missing Alt text on Figure/Image elements are highlighted.
Tag Types Displayed
- Document / Part / Sect / Div: Container tags defining structural groupings and sections of the document.
- H / H1-H6: Heading tags defining the document outline and navigable heading hierarchy.
- P / L / LI / LBody: Paragraph and list content tags containing the main text flow.
- Table / TR / TH / TD / Figure / Link / Span: Semantic element tags for tables, images, hyperlinks, and inline text spans.
Limitations & Privacy
The pdf tagged content viewer reads the logical structure tree declared in the PDF. Only PDFs that were exported with tags (from Word, InDesign, or Acrobat's Make Accessible workflow) will show a meaningful tree. Scanned PDFs and most print-exported PDFs have no tag tree. All processing runs locally in your browser - your PDF is never uploaded to any server.
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Frequently Asked Questions About PDF Tagged Content Viewer
A tagged PDF contains a logical structure tree that defines the semantic meaning of every element - headings, paragraphs, lists, tables, figures - and the order in which assistive technologies like screen readers should present them. Tagging is required for PDF/UA (ISO 14289) compliance and strongly recommended for WCAG 2.1 conformance.
It means the PDF was created without accessibility tagging - most likely exported from a print workflow, created from a scanned image, or saved without using "Make Accessible" or "Tagged PDF" export options. You will need to add tags using Adobe Acrobat Pro, PAC (PDF Accessibility Checker), or an accessible publishing workflow in Word, InDesign, or LibreOffice.
The viewer displays all standard PDF structure types including Document, Part, Sect, Div, Article, P (paragraph), H through H6 (headings), L/LI/LBody (lists), Table/TR/TH/TD, Figure, Link, Span, and any custom role-mapped tags. Non-standard tags are shown with their raw type string.
Figure, Image, and Formula tags without an Alt or ActualText attribute are highlighted because missing alternative text is one of the most common PDF accessibility failures. Screen readers cannot convey the meaning of an image to a visually impaired user without alt text.
No. The entire pdf tagged content viewer runs locally in your browser using client-side JavaScript. Your PDF is never transmitted to any external server.
No - the pdf tagged content viewer is a read-only inspection tool. It helps you identify exactly which tags are present, missing, or incorrectly structured, but fixing them requires an authoring tool such as Adobe Acrobat Pro or an accessible export from your source document.
Yes, completely free. No registration, no file size limit, and no restrictions on how many PDFs you inspect.