About filling in PDF forms
Many official and business forms are PDFs with fillable fields, built so you can complete them on screen instead of printing them. This tool reads those fields and lets you fill them in any browser, including on a phone. Flatten decides what happens to your answers. Without it, the form stays fillable, so you or someone else can change answers later, which suits drafts and forms that pass between people. With it, your answers become part of the page and the fields disappear, which suits a final copy you submit, because the answers cannot be changed accidentally and look the same in every reader. Some forms are built with an older technology called XFA, often made in Adobe LiveCycle; these cannot be filled here and you will see a message saying so. Open those in Adobe Acrobat Reader instead. If a form has no fields at all, such as a scanned form, use Edit PDF to add text boxes, or print it. To sign the form, use Sign PDF afterwards.
Limits: one PDF per task, up to 25 MB with a free account, 200 MB on Pro and 500 MB on Business. XFA forms are not supported. Browser tools have no daily task limit.
Before you sign in, files can be up to 25 MB. A free account raises this to 25 MB.
Privacy: this tool runs entirely in your browser; the file never leaves your device. Nothing is uploaded, so the answers you type stay on your device.
How to use the PDF tools: Step-by-step help with every tool, limits and your files.
Fill PDF form: frequently asked questions
What does flatten mean?
Flattening turns your answers into ordinary page content and removes the fields, so nobody can change them later.
Why does it say my form is not supported?
The form uses XFA, an older format this tool cannot fill. Open it in Adobe Acrobat Reader instead.
My PDF has no fields. Can I still fill it in?
Not with this tool. Use Edit PDF to add text boxes on top of the page.
Can I save and finish the form later?
Yes. Save it without flattening, then open the saved copy here again to carry on.