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PDF Form Field Inspector

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

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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, types, required flags, and read-only flags from a PDF locally. The tool does not inspect XFA forms or validate signatures. See the PDF forms and signatures reference for those format distinctions.

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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