Best way to create signature?

Yo, I ran into the exact same problem when I started out. Signing directly on my phone screen gave me that shaky, unnatural look too—it's pretty much impossible to get a steady line because capacitive touchscreens are super sensitive to the slightest hand tremor and they don't have the friction of paper. The result always ends up looking like a zigzag mess, especially if you zoom in even a tiny bit.

After messing around with a few things, honestly this is what works for me. I grab a white piece of paper—printer paper is fine, nothing textured—and sign it with a fine-tip pen, like a Pilot G2 or a sharpie if you want thicker lines. Then I scan it at 300 DPI minimum (600 is even better for clarity). Next, open it in Photoshop, GIMP, or even Paint.NET, crank up the contrast to remove any background gray, and use the threshold tool to get a crisp black-on-white line. From there you can crop it to just the signature and paste it over the template. If it still looks a little rough, I'll clean up individual shaky spots with the eraser or a brush tool.

One thing I learned the hard way: don't press too hard on the paper. You want a consistent line width, because a ballpoint under pressure can leave uneven ink pools when scanned. Also, avoid using cursive loops that close up too much, like "e" and "l" right next to each other—after threshold adjustment those can fill in and look like a blob. If you want to go the extra mile, you can import the scan into Illustrator or Inkscape and auto-trace the black to a vector path; that way you can scale it without any loss in quality and even tweak the curves if you're patient. But honestly, a clean 300 DPI scan with a little contrast boost is all you need for a natural result.

For prevention down the line: sign a few versions on the same sheet, pick the smoothest one, and save the cleaned-up digital copy as a transparent PNG. That way you don't have to re-scan every time. And if you ever use a stylus on a tablet instead of paper, make sure the app you're using supports pressure sensitivity—like Adobe Fresco or even the built-in Notes app on iPad—and try to rest your hand on the screen for stability. Honestly, the paper-and-scan method is still king for that clean, human look.