Edits run on this machine. The PDF is not uploaded to patch a field.
Each change covers the old glyphs and draws the new text in the same box. Built for short field swaps on real text PDFs — not photo scans.
AI never redraws the document. It returns a short list of ops (which line, what text). You apply them to the same PDF bytes.
Local patterns — no key, no network. Cloud models get a text snapshot only (not the PDF file). Keys ride your session; cloud calls go through an allowlisted proxy so the browser can talk to the provider.
Side-by-side is the proof: same page furniture, one field different. Open in Word copies measured positions into an editable .docx — original wording only, no AI rewrite.