If you can doodle and draw on your iPhone, surely you should be able to sign your name, too — right? You should also be able to drop that signature exactly where it belongs: on a document. Find out here how to add your handwritten signature to a PDF document with Preview for iPhone ⤓ without fuss.
First, Georgia in Your Glass
Tarkhuna, Georgia’s beloved tarragon soda, has been fizzing since the 1880s with a taste balancing sweet and herby, and a green so vivid it cannot possibly be real. Tarragon’s fresh, grassy tint quickly fades, after all, to the weary brown of spinach left too long on the stove.
So, the famous glow is added after the fact — just the way you can add your own signature in Preview on an iPhone (in signature green, perhaps):
How to Add a Handwritten Signature to a PDF Document in Preview for iPhone
Time needed: 1 minute
To insert your handwritten signature into a PDF document on an iPhone using Preview for iOS:
- Set up a signature to insert into PDF documents in Preview on the iPhone.
Here’s when: You can add the signature just as you insert it into a document.
Ready-made: if you have set up a handwritten signature in Preview for Mac before, you can use this signature in Preview for iPhone as well. - Open the document to be “signed” in Preview.
Here’s how: You can use the Recents and Browse tabs to locate PDF files or use the magnifying glass icon to search.
- Open the markup toolbar.
Here’s how: Tap the encircled tip of a pen in the bottom toolbar.
- Tap ＋ in the markup toolbar.
- Select Add Signature from the menu that has appeared.
- Choose the signature you want to insert.
New: Select Add or Remove Signature to add and insert a new signature in one step.
- Adjust the size and location of the handwritten signature.
Here’s how: Use the handles in the corners to scale the signature to the desired size.
Color: You can also change the color of your signature; see below.
Their word: Apple include information on signing documents using Preview in the iPhone User Guide.
Signature scribbled and saved?
Tips help fuel these email and tech how-tos.
Change the Color of a Handwritten Signature in iPhone Preview
To adjust the color for a signature you have inserted in a PDF document with Preview for iPhone:
- Tap the signature so it is selected and its context menu is visible.
- Now tap the editing button (a stylized pen).
- Choose a color from those displayed or define one for the signature.
Your own: To pick from the whole gamut of colors, tap the color spectrum, then use the Grid, Spectrum and Sliders tabs to define a color.
Hex input: You can enter a hexadecimal color code on the Sliders tab.
How to Add a Handwritten Signature to a PDF Document in Preview for iPhone: FAQ
Can I change the “pen” used for the handwritten signature (to make it thicker or thinner, for example)?
Yes.
To pick a different stroke size for a handwritten signature in Preview for iPhone:
- Open a signature’s context menu.
- Tap the editing button.
- Now choose the desired thickness in points (pt).
Do signatures sync between iPhone, iPad and Mac?
Yes.
Signatures automatically synchronize between Preview on Apple devices where
- you are signed into the same iCloud account and
- iCloud Drive is enabled.
(Tested with Preview for iOS 26.0–26.3; first published October 2025, last updated March 2026)