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Flattening converts all interactive elements — form fields, annotations, layers, and markup — into static page content. The result looks identical but cannot be edited or filled.

Flatten a PDF before sharing to lock form fields and prevent editing. It is also required before printing to ensure all annotation layers are rendered correctly.

No. Once flattened, the interactive elements cannot be restored. Always keep a copy of the original file before flattening.

Yes. Flatten any PDF for free, instantly, with no account or software required.