Handwriting On My Photography

Does Photoshop on the iPad have the CC Libraries?  If so, that is the perfect place to save a signature. That makes it accessible any time.

There are at least four ways, maybe more:

• What davescm already wrote about using a Wacom tablet directly, because Photoshop has supported Wacom tablets well for over 20 years. Including support for Wacom stylus pressure, and if your tablet has these, barrel angle and barrel rotation too. So you can use a Wacom stylus to write expressively on a Photoshop layer using any Photoshop brush settings you want, like a calligraphic brush. 
• In Photoshop for iPad, you can use an Apple Pencil to write on a new Photoshop document and then open that on the desktop, or you can create a Photoshop document on the desktop and open it on Photoshop on iPad, write on that, and open it back on the desktop. 
• In Photoshop for macOS, if you set up your iPad as a second Mac display using Sidecar, you can move the Mac Photoshop window to the iPad screen, and write with the Apple Pencil on the iPad directly in that Mac Photoshop document. 
• In Photoshop for macOS, if you choose File > Import from iPhone or iPad > Add Sketch, a new sketch window will open on your iPad. You can write there, and when you click Done, the iPad will send the sketch back to Mac Photoshop as a new document. You can drag that document’s layer and drop it on another document. 

You can write directly onto an empty layer in Photoshop using a Wacom tablet (or similar). If you want to use that same handwritten text in other images, just drag the layer into another document.

Make sure you save in a format that supports layers and transparency i.e. TIFF/PSD or if only using one layer with transparency PNG. JPEG does not support transparency so is not suitable.

Dave