How do I check if a form is fillable?

Click into it — or run it through the free PDF Inspector, which counts form fields.

Can recipients still edit a filled form?

Yes, unless you flatten it — flattening makes the values permanent page content.

AI & Documents · Updated September 25, 2026

How do I auto-fill a PDF form with AI?

Short answer

Open the form, point the AI at your source information, and it maps names, dates, addresses, and values into the matching form fields for you to review before saving — the form must have real fillable fields, or fields must be added first.

Fillable vs flat forms

A fillable form has interactive fields — text boxes, checkboxes, dropdowns — that hold values. A flat form is just lines and labels on the page; there is nowhere for a value to go. Our free PDF Inspector reports the field count, so you can check which kind you have before starting.

How AI Form Fill works

Give the AI your source information — a block of text, a record, the details you would otherwise retype — and it matches values to the form’s fields: names to name fields, dates to date fields, addresses to address fields. The draft fill appears in the form for you to review and correct before saving.

Review, then flatten

Check every field — automation is fast, not infallible. Once the form is right, flatten it to bake the values into the page so they cannot be edited downstream. Our free Flatten PDF tool does this in the browser.

Key takeaways

Auto-fill maps your data into the form’s existing fields.
Flat forms need fields added before any auto-fill works.
Always review the draft fill before saving.
Flatten afterwards to make the values permanent.

Do it in PDFDepth

AI Form FillAI reads your project PDFs and auto-completes form fields with the right names, dates, values, and references. You just review and submit.

Try it free — no signup, no upload

PDF Inspector Flatten PDF

How do I edit text in a PDF without changing the font?How do I build a chronological timeline from a folder of PDFs?How do I make a scanned PDF searchable (OCR)?

Put it into practice

Everything above runs inside the PDFDepth workspace — free for 14 days, no credit card.

Start for Free