Free PDF Tool
Flatten PDF
Lock Forms & Annotations Free
Convert interactive PDF form fields, checkboxes, digital signatures, and annotations into static content that cannot be modified. Ideal for finalising submitted forms, archiving completed documents, or ensuring consistent appearance across all PDF viewers. Runs entirely in your browser.
Drag & drop your PDF here
Form fields, annotations and layers will be flattened
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Common Uses
📝 Submitted Forms
Flatten filled government or bank forms before archiving to prevent accidental modification.
✍️ Signed Documents
Flatten digital signatures into the PDF to prevent signature fields from being cleared.
🖨️ Print-ready Documents
Flatten before printing to ensure form fields render correctly on all printers.
📤 Final Submissions
Flatten before submitting to courts, universities, or government portals.
Frequently Asked Questions
What does flattening a PDF do?
Flattening merges interactive elements (form fields, checkboxes, signatures, annotations) into the page itself, making them part of the static content. The PDF can no longer be edited interactively.
Why would I flatten a PDF?
To prevent others from changing form data after submission, to ensure a PDF looks the same in all viewers, or to finalise a document before archiving or printing.
Does flattening reduce file size?
Often yes, since the interactive elements and their metadata are removed and replaced with simpler static content.
Can I unflatten a PDF after flattening?
No. Flattening is permanent. Keep a copy of the original if you need the interactive version.