Is Flatten PDF free to use?

Yes — completely free, with no sign-up and no watermark on the output.

Flatten PDF

Merge form fields and annotations into the page. Free online — no sign-up, no watermark.

FreeNo sign-up No watermark

Flatten form fields and annotations into the page — lock in filled forms and comments so they can't be edited further.

Fix, annotate and polish PDFs without heavyweight desktop apps — add watermarks, page numbers, headers, signatures and form fields, crop pages, fill forms and adjust colors right in the browser.

Accepts .pdf files. This tool runs entirely in your browser — your file never leaves your device.

How to use Flatten PDF

Upload your file — drag and drop it onto the page or click to browse.
Adjust the tool's options if needed, then run it.
Download the finished file straight to your device.

Frequently asked questions

Is Flatten PDF free to use?: Yes — completely free, with no sign-up and no watermark on the output.
Is my file safe?: This tool runs entirely in your browser — your file never leaves your device.
What files does Flatten PDF accept?: Accepts .pdf files.

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