How to fill out a PDF form on iPhone, iPad or Mac (free)

Step by step

Open the form and choose Forms
Open the PDF and choose Forms in the toolbar. Existing fields are highlighted.
Type into the fields
Tap a field and type; tick checkboxes; pick from drop-downs. Fill This Form For Me fills common fields from details you saved in the app; they are kept in the device’s Keychain and never uploaded.
No fields? Add them
On a flat form choose Add Form Field and draw a text field, checkbox or signature field where you need it.
Sign
Choose Sign to place your saved signature and a date stamp.
Save, or flatten and share
Save keeps the fields editable. Flatten Form Fields makes the entries part of the page so they can no longer be changed, which is what most recipients want.

Form values are stored in the PDF itself, so the filled form opens in any reader.
Everything, including Fill This Form For Me, happens on your device.

Questions and answers

Is form filling free?

Yes. Filling, adding fields, signing and flattening are free.

Can I fill a form that has no fields?

Yes. Add fields yourself or simply place text with the Text tool.

How do I stop the recipient from changing my entries?

Use Flatten Form Fields before sharing. The entries become part of the page.