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Flatten PDF
Flatten form fields and annotations so a PDF can no longer be edited.
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Your file never leaves your browser
No signup required
No daily limit
Always free
How to use Flatten PDF
- 1
Upload your file
Drag and drop your file onto the upload area, or click to browse your device.
- 2
Choose options
Configure any settings you need, then click the process button.
- 3
Download result
Your processed file is ready instantly. Click Download to save it.
Frequently Asked Questions
It merges interactive form fields and annotations into the page content so they become permanent and can no longer be edited or changed.
Flattening locks filled forms before sharing, prevents accidental edits, and ensures the document looks identical in every PDF viewer.
Yes. The values stay fully visible on the page — they just can no longer be edited as form fields.
No. Flattening runs entirely in your browser and your PDF never leaves your device.