What does flatten do?

Flattening merges form fields and annotations into page content, making them non-editable and ensuring correct display on all viewers/printers.

When should I flatten?

Before sharing filled forms, submitting to portals, or printing. It locks content and reduces file issues.

Will flatten change appearance?

No. Visual appearance is preserved; only interactivity is removed.

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Flatten PDF

Make PDF forms non-editable and flatten annotations for reliable sharing and printing.

No settings required — just upload and flatten. Works with AcroForms and widgets.

Need 200MB/500MB? Upgrade to Pro/Business

Related Guide — Learn more about this tool

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PDF Security Bible 2026: Protect, Unlock, Redact, Flatten, Sign & Request Signatures

Salary slips to contracts — learn how to lock, redact, sign and flatten PDFs so they stay secure and tamper-proof.

Read guide Sep 3, 202612 min read