Flatten PDF
Convert interactive form fields into static content, preserving their visual appearance.
100% private — processed on your deviceDrop your files here
or click to browse — add as many as you like
Flatten options
Flattening converts interactive form fields into static content. The visual appearance is preserved but fields can no longer be edited.
Local processing
Files never leave your device
Flatten a PDF to lock down its form fields and annotations, turning a fillable document into static content that can't be edited. PDF Bunker flattens the file in your browser, so it is never uploaded.
How it works
- 1Drop your PDF into the upload area, or click to browse for it.
- 2Keep Flatten form fields enabled to merge the fields into the page.
- 3Click Flatten PDF to bake the fields and annotations into static content.
- 4Download the flattened PDF, with its appearance preserved but no longer editable.
Frequently asked questions
What does flattening a PDF do?
It converts interactive form fields and annotations into static page content. The visual appearance is preserved, but the fields can no longer be edited or changed.
Is my PDF uploaded to flatten it?
No. Flattening happens entirely in your browser, so your document never leaves your device.
Does it work offline?
Yes — once the page has loaded, you can flatten a PDF with your internet disconnected.
Can I flatten several PDFs at once?
Batch processing is a Pro feature. Pro ($5/mo) lets you flatten many files at once and download them as a zip, and also removes the 25 MB free file-size cap.