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PDF Form Field Inspector

List PDF AcroForm field names, types, required flags, and read-only flags locally.

Runs locally in your browser. Your input is not uploaded or stored. You can verify this in your browser’s network panel.

Processing limits

  • Accepted formats: PDF
  • Maximum file size: 25 MB
  • Maximum pages: 100

What does this tool solve?

List AcroForm field names, field types, required flags, and read-only flags from a PDF locally.

Continue with PDF Page Geometry Inspector, PDF Splitter

What examples should you start with?

Fillable form

Input
Text
ApplicantName · PDFTextField
Output
Text
required: yes · read-only: no

Static PDF

Input
Text
No AcroForm fields
Output
Text
No readable fields found

How does it work?

pdf-lib reads the document's AcroForm and maps each field to a small summary. Field values are not displayed or uploaded.

The page count is checked separately so large documents stay within the same browser-memory boundary as the other PDF tools.

What are the edge cases and limits?

  • PDF size is limited to 25 MB and page count to 100 pages.
  • This tool inspects AcroForm fields; it does not OCR printed blanks or inspect XFA form packages.
  • Changing or signing a PDF is outside this tool's scope, and digital signature validity should be checked in a dedicated PDF application.

Technical reference

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