Flattening locks in filled form values so no one can change them, and fixes forms that print blank or misaligned in viewers that don't render field appearances.

What happens if my PDF has no form fields?

It's simply re-saved unchanged — flattening only has an effect on PDFs with interactive fields.

Can the flattened values still be edited afterwards?

No — once flattened they're part of the page content. Keep your original if you might need to change the answers later.

Flatten PDF

Bake form fields and filled-in values into the page so they can't be edited and always print correctly. Nothing leaves your browser.

Read the Flatten PDF guide

Processed on your device

Upload a PDF to Flatten PDF

Drag and drop or click to select

Once flatten pdf is done, you can send the result straight into another tool — merge, sign, compress, and more — without downloading and re-uploading.

Works well with

Fill PDF Form

Fill in a PDF's real form fields — text, checkboxes, radios, dropdowns — then flatten it.

Sign PDF

Draw or type a signature and place it on a PDF page.

Protect PDF

Add an open password and/or restrict printing, copying, and editing — AES-256 encrypted.

Flatten PDF

Works well with

Common questions

Why flatten a PDF?

What happens if my PDF has no form fields?

Can the flattened values still be edited afterwards?