Flatten PDF — Lock Form Fields Free & Private
Convert all interactive form fields, checkboxes, and annotations into static, non-editable content. 100% client-side — your PDF never leaves your device.
What does flattening do?
Flattening permanently merges form fields (text boxes, checkboxes, radio buttons, signatures) into the page content. The result looks identical but the fields can no longer be edited or re-submitted. Perfect for distributing filled forms.
Flatten PDF Forms
Lock fields permanently · no editing · all local
Upload PDF to Flatten
All processing happens in your browser. Your PDF is never uploaded to any server.
Why Flatten a PDF?
Prevent Editing
Recipients can't change filled form data after flattening.
Better Compatibility
Flattened PDFs render identically across all PDF viewers.
Reduce File Size
Removing interactive layers often reduces the final file size.
Frequently Asked Questions
Can I undo flattening?
No — flattening is permanent. Keep your original if you may need to edit fields again.
Is it free?
Yes, completely free. No account, no watermarks, no limits.
Is my PDF secure?
Yes. All processing happens locally in your browser — no uploads ever.
Any page limit?
No limits. All processing is client-side so file size and page count are unrestricted.
What gets flattened?
Text fields, checkboxes, radio buttons, dropdowns, digital signatures, and annotations.
Do I need an account?
No account required. Flatten immediately with no sign-up.
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Your Privacy Matters
Don't worry - we're not eyeing your data. You are safe here. We do not store your important data. Files are automatically deleted after processing, and we never access or share your documents.