[NikxDa]

An alternative that works very well for signatures too is Perfect Freehand (by the guy behind TLDRaw)

https://perfect-freehand-example.vercel.app/

[npteljes]

This is fantastic! Never in my life could I input my signature with a mouse, and have it come out this close to how it looks like the pen-and-paper version. Mindblowing, as it worked like so out of the box.

[mgaunard]

That looks much better indeed, wasn't able to write anything with the OP's library.

[cptskippy]

The OP's library gas settings if you scroll down. I found these values work well on my phone: 20, 0.05, 5

[dwringer]

Using a trackball I couldn't get this to work noticeably better than just plain paintbrush input in MS Paint. Conversely the one from TFA took me a little more time to get the hang of but I got a lot better control with it.

[lionkor]

Is it allowed to modify the signature someone puts digitally on a document? Because that's what this does. Is that not an issue?

[stavros]

That's also what a pen does, but we haven't banned pens. Don't forge signatures, it's illegal.

[johnisgood]

Stop, you are making too much sense. /s

(I honestly am baffled that things like this have to be said.)

[stavros]

Me too, but alas, they do :(

[arcticbull]

Have you met Preview's Tools > Annotate > Signature?

If you're concerned about people modifying a document after you share it out, consider using a digital signature or a hash.

[fwip]

I feel like if you're modifying the signature after they sign it and approve it - that could be a problem. As long as the modifications are applied in real-time (or with explicit user confirmation after modification), I think it is morally okay (and probably legally, but I'm not a lawyer).

You may find users who get mad if your settings are too aggressive though, and if they're unable to get a signature that they approve of.

[heeton]

What makes you say the library is modifying the signature? (It’s not)

[thinkingemote]

Given it a bit of thought (as I was also puzzled), I think the comment was about the modification compared to a normal way of doing it. So if I would normally write a scribble with angular lines for a signature, and it might be consistent across different places, this brush could smooth it out and modify what it might be.