PDF Form Field Inspector

How to use

1. 1Drop a fillable PDF onto the drop zone or click Choose file to pick one. Up to 200 MB. The file is read in your browser.
2. 2Read the summary card for the total field count, the number of required fields, the number of pre-filled defaults, and whether the document declares an AcroForm catalog.
3. 3Click any type chip (Text, Checkbox, Radio, Dropdown, Pushbutton, Signature) to narrow the field list to one category, or use the search box to filter by name, value, or tooltip.
4. 4Click Copy name on any row to copy the field name, or use Copy field names, Copy CSV, or Copy JSON to export the full list for scripts and spreadsheets.

About this tool

PDF Form Field Inspector reads any fillable PDF in your browser and lists every form field on a single page. For each widget annotation it reports the partial field name (/T), the user-facing tooltip (/TU), the field type derived from /FT and /Ff (text input, checkbox, radio button, dropdown, list box, pushbutton, or signature), the current value (/V), the default value (/DV), the maximum length for text fields (/MaxLen), the comb count for character-segment text inputs, and the option list for choice fields (/Opt). The field flags bitfield (/Ff) is decoded into human readable badges so you can see at a glance which fields are required, read-only, no-export, multiline, password, or part of a radio-button group. The inspector groups duplicate field names that PDFs use to share state across several widget annotations (typical for radio sets), so the counts you see match the field count a real PDF reader would surface. A type filter narrows the list to just text inputs, just checkboxes, or any single category, and a free-text search filters by name, value, or tooltip. Three exports take the full field list with you in a single click: a newline list of field names ready to paste into a script, a CSV with name, type, value, default, required, read-only, max length, and tooltip columns ready for a spreadsheet, and a JSON document with every detected attribute for programmatic use. Useful for accessibility auditors confirming required fields, paralegals and HR teams checking that an intake PDF has the right inputs before a mass mailing, automation engineers wiring PDF form fillers to a webhook, QA testers comparing a vendor's PDF against an expected schema, and developers building bulk PDF generators who need to verify the AcroForm catalog after a template update. The inspector also reports whether the PDF declares an /AcroForm catalog and whether it is encrypted, so you can tell at a glance when widget annotations exist on a page but the document does not register them as a coordinated form. Everything runs in your browser. The PDF is read with file.arrayBuffer, scanned in place, and discarded when the tab closes. No file is uploaded to a server.

Free to use. Works in your browser. No signup, no login.