Flatten PDF

When to use Flatten PDF

You filled out a W-9 or a rental application in a PDF form tool, and now you want to send a version where the recipient can't accidentally clear or alter your answers. Or a signed contract still has floating annotation layers that display differently across PDF readers and you want one consistent, print-ready file. Drop the completed PDF here and pdf-lib bakes every form field and annotation directly into the static page content on your machine. What was an interactive checkbox becomes a drawn mark; what was a floating text comment becomes part of the page. The document opens identically in every reader and prints exactly as it looks on screen.

• Lock a completed W-9 so form fields can't be cleared before sending
• Flatten a signed contract so annotations render the same in every reader
• Bake in form answers before submitting to a government portal

About this tool

Most form-filling tools leave interactive fields floating above the page content — which can break printing, cause display glitches in some readers, or let recipients edit fields you meant to lock. Flattening bakes those fields and annotations directly into the page so what you see is exactly what anyone else gets. Useful before sending a completed tax form, locking down a signed contract, or archiving a document you don't want changed. Your file never leaves this browser tab — everything is handled locally, no upload required.