Inspect PDF Page Labels - Free Online Browser Tool

Inspect Roman, alphabetic, prefixed and numbered PDF page labels and export the ranges as JSON locally.

A PDF can display front matter as i, ii and iii while its physical pages remain 1, 2 and 3. This inspector reads the page-label number tree, expands supported ranges into readable labels, and marks missing or unsupported information honestly without modifying the document.

This inspect pdf page labels utility runs completely inside your web browser. Your document is opened locally and processed on your own device using JavaScript and WebAssembly, so your file is never uploaded to any server. There is no signup, no watermark and no limit on how many documents you can handle.

  • 100% client-side - files never leave your device
  • Instant processing, no upload wait
  • Works on desktop, tablet and mobile
  • Free forever, no account required

Common next steps: Edit PDF Bookmarks, Extract PDF Bookmarks, Document Statistics, PDF Version Inspector.

How to Use the Inspect PDF Page Labels Tool

Four steps, and the whole thing runs locally on your own device.

  1. Select a PDF

    The file is read locally and its page count is obtained before labels are expanded.

  2. Review label ranges

    See decimal, Roman, alphabetic and prefixed sections with their starting page.

  3. Check warnings

    A file without a PageLabels tree is reported as using normal physical page numbers.

  4. Download JSON

    Export the ranges and expanded labels for cataloguing or another PDF workflow.

Frequently Asked Questions

Does this change the page labels?

No. It is a read-only inspector and JSON exporter; the original PDF bytes are unchanged.

Which label styles are supported?

Decimal, uppercase and lowercase Roman numerals, uppercase and lowercase alphabetic labels, prefixes and starting values are expanded.

What if the PDF has no page labels?

The report says the PageLabels tree is missing and explains that readers normally use physical page numbers.

Are page labels the same as printed page numbers?

No. Page labels are navigation metadata; printed numbers drawn on the page are visual content and are handled by page-number tools.

Is the document uploaded?

No. The inspection and JSON report are generated entirely in the browser.