AI-Assisted PDF Signing: Auto-Detect Signature Fields and Auto-Fill Forms
Quick answer
Sign PDF can now detect signature fields in a PDF for you: it scans the document for phrasing like "Signature:" or "Date:" and marks each spot on the page with its own accept or reject button. If the file has real interactive form fields, a Fill form button proposes a value for each one it can infer from the document's own text. Nothing is written to the page until you confirm it, and clicking Apply with no signature placed warns you rather than silently producing an unsigned file.
What's new: AI does the tedious part of signing
Signing a PDF usually means scrolling through every page hunting for the 'Signature:' and 'Date:' lines, then manually filling in any other blank fields the document asks for. Sign PDF now automates the hunting: it scans the document for likely signature and date spots, suggests values for form fields it can confidently infer from the document itself, and checks that you haven't finalized a document with no signature on it at all.
None of this is a black box that silently changes your document — every suggestion is shown to you first and only applied when you accept it.
Auto-detect where to sign (and where to date it)
As soon as you upload a document, Sign PDF scans the text for common signature-block phrasing — 'Signature:', 'Signed by', 'Authorized Signature' — and date phrasing like 'Date:' or 'Signed on', and marks each spot with a dashed outline directly on the page.
Each suggestion has its own accept or reject button. Accepting a signature spot opens the normal draw/type/upload signature tool already targeted at that exact location; accepting a date spot drops in today's date immediately, no typing required. Reject just dismisses that one suggestion — nothing is placed on the page until you say so.
Let AI fill the rest of the form
If the uploaded PDF has real fillable form fields — not just visual lines, but an actual interactive form, like a registration or intake form — a 'Fill form' button appears. AI reads the document's own text and proposes a value for each field it can confidently infer, grounded strictly in what the document already says, not invented.
Every proposed value shows up in an editable, checked-by-default list — the same review-before-you-act pattern Smart Redact uses for suggested redactions. Uncheck or edit anything before applying; only what you confirm gets written into the form.
Never accidentally send an unsigned document
Clicking Apply & Download with no signature placed now shows a warning instead of silently producing an unsigned file — a real, easy mistake when a document has several fields and it's simple to fill everything except the signature itself.
It's a warning, not a hard block, since a signature genuinely isn't always required (initials-only forms, for instance). You can jump straight back to the detected signature spot, or confirm and proceed anyway if that's actually what the document needs.