Flatten PDF files online to merge form fields, annotations, and other interactive elements into a fixed document layer for easier sharing, printing, and archiving.
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PDF • Max 100MB
Flatten PDF merges form fields, annotations, and comments permanently into the page content, so the finished document can no longer be edited or filled in further. This is a common last step after filling out a fillable form, adding sign-off comments, or finalizing a document before sending it out — it prevents anyone from accidentally (or intentionally) changing the answers or notes after the fact. Upload your PDF, flatten it, and download a locked-down version where everything that was interactive is now a permanent part of the page.
Drop your PDF into the box — filled forms, comments, stamps, and all. The file never leaves your device.
The tool merges every interactive element into one static layer that can't be edited or undone.
Download the flattened PDF — what you see is now exactly what every recipient sees.
Keep an unflattened copy if you might need to edit later; flattening is a one-way door.
Lock form fields and annotations into a single fixed layer before you send — free and fully local.
Filled form fields become permanent, uneditable page content.
Comments and markup are merged into the page instead of staying editable.
Prevent accidental or unwanted changes after finalizing a document.
Flattening happens in your browser — your file is never uploaded.
Flatten unlimited PDFs at no cost.
It permanently merges fillable form fields, comments, and annotations into the page, so they can no longer be edited.
Typically after filling out a form or finalizing comments, to lock in the answers before sending or archiving the file.
No, flattening is permanent for that copy. Keep your original fillable version if you might need to edit it again.
Yes, this tool is completely free with no limit on how many files you flatten.
No. The process runs entirely in your browser, so your document stays private.
Flatten PDF Online Tool