Flatten PDF
Merge form fields and annotations into the page content permanently.
- 100% Private
- No Limits
- Works Offline
or drag and drop here
Lock in a PDF's form fields and annotations so they become part of the page content and can no longer be edited or filled in. Runs locally in your browser.
How to use this tool
- 1
Upload your PDF
Click the upload area or drag in a document with form fields or annotations.
- 2
Flatten and download
Click flatten — your document downloads immediately, no options needed.
Why use this tool
Nothing leaves your device
Flattening happens locally via WebAssembly — your document is never uploaded.
Prevents further edits
Once flattened, form fields can't be accidentally changed by the next person who opens it.
Consistent appearance everywhere
Flattened content renders the same in every PDF viewer, unlike some live form fields.
Common use cases
Finalize a filled-in form
Lock in your answers before sending a completed form to someone else.
Lock in a signature
Make sure a signature placed on a document can't be moved or deleted.
Prepare for archiving
Flatten interactive elements before storing a document long-term.
Pro tips
- Flattening is one-way — keep a copy of the original if you might need to edit the form again later.
- A PDF with no form fields or annotations is returned unchanged — flattening is safe to run on any file.
- Sign PDF and Fill PDF Form both work well together with Flatten PDF as a final step.