PDF Form Fields Inspector & Extractor
PDF Form Fields Inspector & Extractor: Traverses `/AcroForm` `/Fields` array, extracts field names, types (text, checkbox, radio), and entered string values.
About this pdf form fields inspector & extractor
PDF Form Fields Inspector & Extractor — browser-based utility.
How this tool works
Implements client-side PDF Form Fields Inspector & Extractor operations. Traverses `/AcroForm` `/Fields` array, extracts field names, types (text, checkbox, radio), and entered string values specifically designed for a loan processing clerk extracts all filled acroform fields from a mortgage application pdf.
- PDF Catalog & XRef Ingestion: Parses binary PDF headers, trailer dictionaries, and cross-reference streams to index document object IDs.
- Page Tree & Box Dimension Inspection: Reads /MediaBox, /CropBox, and /Rotate attributes for each page dictionary in the document hierarchy.
- Symmetrical Coordinate Transformation: Calculates offsets relative to existing [x, y] origins for margin trimming or updates /Rotate angles.
- Document Re-serialization: Re-serializes the PDF object stream, updating byte offsets in the XRef table and preserving AcroForm dictionaries.
Worked example
Scenario: Inspect a local one-page AcroForm PDF.
Sample input:
Processing: Read fields with pdf-lib getForm and report names plus constructor types.
Illustrative output:
Limits and verification
Password-encrypted PDF files must be decrypted before processing. Margin cropping offsets cannot exceed half of the page width or height. Files with damaged XRef tables are repaired automatically where possible.
Examples demonstrate an expected workflow; they do not prove every input or every branch of an external specification. Check important results with an independent source before using them for money, security, compliance, safety, or irreversible file changes.
Browser processing boundary
Tool input is processed by code running in the browser and is not intentionally sent to a CZOA processing API. The page can still request ordinary site assets, analytics, or advertising when those services are enabled. Browser extensions and managed-device software remain outside this tool's control.
Relevant references
These references govern or help explain the format, protocol, or calculation used here. Listing a reference does not claim certification or complete implementation of every optional feature.
Content owner: CZOA Tools · Last reviewed: 2026-09-15 · Review methodology
How to use it
- Enter, paste, or select your input data into the PDF Form Fields Inspector & Extractor workspace controls.
- Review available parameter fields, units, formats, or options configured for your task.
- Click the action button or observe immediate live calculations rendered in your browser runtime.
- Inspect the resulting output and any diagnostic messages, then copy or download the result if needed.
Frequently asked questions
How does PDF Form Inspector inspect fields?+
It loads the first selected PDF with pdf-lib, reads its AcroForm through getForm(), and returns JSON containing the page count plus each field’s name and JavaScript constructor name. It does not edit or fill the PDF.
Which controls and output are available?+
The page provides one local PDF chooser and Process locally. The output is a readonly JSON result with pages and fields. There are no controls to set values, flatten fields, export data, choose pages, inspect widget geometry, validate appearance streams, or save a changed PDF.
What limits apply to the inventory?+
The field type is the runtime constructor name exposed by pdf-lib, not a complete PDF specification classification. It does not report field values, flags, hierarchy, calculation actions, JavaScript, signatures, annotation appearance, XFA, or viewer permissions. Encrypted or malformed PDFs may fail to load.
What did isolated browser verification show?+
In an isolated Chromium file run, a one-page PDF with customer_name set to Ada Lovelace returned its page count and field inventory; independent pypdf inspection found the same AcroForm name. This covers that inventory path, not every form model or field value.