Flatten PDF
Upload a PDF that contains fillable form fields or annotations and flatten it into a static document. Flattening burns the current values of text fields, checkboxes, dropdowns, and other interactive elements into the page content, so they can no longer be edited.
This is commonly needed before sharing completed forms — it prevents recipients from accidentally or intentionally changing filled-in values. It also reduces file complexity and can fix rendering issues in viewers that handle forms inconsistently.
The flattening is performed by pdf-lib entirely in your browser. Your file is never uploaded to a server.
By The Paper Room Editorial Team — PDF Tools
Frequently asked questions
What does 'flatten' mean for a PDF?▼
Flattening converts interactive elements — form fields, annotations, comments — into static page content. The visual appearance is preserved, but the elements can no longer be clicked, edited, or filled in. It is a one-way operation.
Can I undo flattening?▼
No. Once a PDF is flattened, the interactive elements are permanently merged into the page content. Keep your original file if you might need to edit the form fields again later.
Does this upload my PDF to a server?▼
No. The entire process runs in your browser using pdf-lib. Your file never leaves your device.