Upload a PDF and stamp text annotations on any page — pick the page, position, font size, and colour, then download. 100% browser-based, your file never leaves your device.
No. pdf-lib does all the drawing in your browser, so even confidential PDFs (contracts, medical records, financial documents) stay completely private.
PDF coordinates start at the bottom-left (0,0). An A4 page is 595 × 842 pt, Letter is 612 × 792 pt. Use Y ≈ 800 to place text near the top of A4, X ≈ 50 for a left margin.
Not from this tool — annotations are drawn as permanent page content. Your original file on disk is untouched, so re-upload it if you need to start fresh.