Flatten PDF
Lock form fields and annotations into static page content.
or drag and drop · max 50 MB
Convert all interactive form fields and widget annotations in a PDF into permanent, non-editable page content. Ideal for finalising a filled form before sharing or archiving — once flattened, the fields can no longer be changed by the recipient. Works on any PDF with AcroForm fields. Runs entirely in your browser using pdf-lib; your file never leaves your device.
How it works
How Flatten PDF works
Upload your PDF
Drop the PDF with form fields you want to lock.
Click Flatten PDF
All form fields and widget annotations are converted to static page content instantly.
Download the flattened PDF
Fields are now permanent — they look identical but can no longer be edited.
FAQ
Frequently asked questions
- No. Flattening runs entirely in your browser using pdf-lib. Your PDF never leaves your device.