What type of file can I upload?

Upload one PDF file. The file must use the PDF format.

Can this validator check an untagged PDF?

Yes. It identifies PDFs without a structure tree and reports an untagged-PDF critical finding.

What does the maximum pages option do?

It limits how many pages are audited. The value can range from 1 to 500, with a default of 100.

What does the reading-order check compare?

It compares structure traversal order with the order of MCIDs in the content stream.

Does this provide formal PDF/UA certification?

No. It is a heuristic audit; formal certification requires tools such as veraPDF or Acrobat.

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PDF Logical Structure Tree WCAG Role Mapping Validator

Audit a tagged PDF's logical structure tree against PDF/UA-1 (ISO 14289-1) semantics: RoleMap termination, H1-H6 heading hierarchy, Alt text on Figure/Formula, RFC 3066 language tags, illegal nesting, and structure-vs-content MCID reading order — each finding labeled with its Matterhorn Protocol checkpoint.

Details

What this tool helps you do

The audit parses per-page structure trees through pdf.js, walks heading/alt/lang/nesting rules from ISO 14289-1 and ISO 32000-1, and compares structure traversal MCID order with content-stream BDC/EMC order. pdf.js 3.x exposes /Alt but not /ActualText and prunes subtrees without marked content on the page — both caveats appear in the report. Heuristic audit; formal PDF/UA certification needs veraPDF or Acrobat.

Execution

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Prepared example runs

Click an example to fill the form automatically. File inputs still need an upload.

2 examples

Audit a tagged zh-CN accessibility report PDF

A real 2-page tagged report with a Document-level zh-CN language tag and an H1 followed by H2 sections is audited: heading hierarchy and language pass, and the structure-vs-content MCID comparison surfaces the reading-order divergence typical of producer tools.

<section>tagged=true · 2 pages checked · headings H1 H2 H2 H2 H2 · lang zh-CN · 1 warning: reading-order (MCID inversions)</section>

Detect an untagged PDF

A multi-page PDF without any structure tree is audited and correctly reported as untagged with a critical finding, instead of crashing or producing empty results.

<section>tagged=false · 6 pages · 1 critical finding: untagged-pdf (Matterhorn 01-005)</section>

Inputs

Set the required fields, then run the tool.

3 options

FilesUpload source files for this workflow.1

PDF filefileRequired

Single file max size: 30 MBSupported types: application/pdf, .pdf

SettingsAdjust formats, ranges, numbers, and modes.1

Max pagesnumberOptionalCap on how many pages are audited (large documents).

TogglesEnable or disable optional behavior.1

Check reading ordercheckboxOptionalEnabled when checkedCompare structure traversal order with content-stream MCID order (09-001).

Result

Ready for a run

Run the tool to preview files, text, structured data, or streamed output here.

Samples

PDF Logical Structure Tree WCAG Role Mapping Validator

What this tool helps you do

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Prepared example runs

Inputs

Result

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Inputs

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Key facts

Overview

When to use

How it works

Use cases

Examples

1. Audit a tagged zh-CN accessibility report

2. Detect an untagged PDF

FAQ

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