Where this actually gets scanned
A code sitting in a purely digital signature that only ever gets viewed on-screen, alone, doesn't get scanned much — there's no natural moment for the reader to grab their phone and point it at their own monitor. It earns its place when the signature also shows up somewhere physical or shared in person: a printed invoice footer, an official letter, a screen-share on a call, or someone glancing at your screen across a desk.
That's not a reason to skip it — it's a reason to keep expectations realistic and always back it up with a visible text link. Think of the code as a bonus shortcut for the moments it works, not the primary way people will reach you.
Sizing and format for a signature block
Don't shrink it down to a 40px icon next to your name — at that size it's often unreadable even on a high-resolution phone screen and definitely unreadable if the signature is ever printed. Aim for roughly 80-120px in the signature itself, large enough to hold up on someone else's monitor or in a printed footer.
Export as PNG with a transparent background rather than SVG for this one — most email clients, especially desktop Outlook, don't reliably render inline SVG images, while PNG displays consistently everywhere. A transparent background also means the code sits cleanly against both light and dark email themes instead of showing a white box.
What to actually link to
Skip linking to your homepage — a signature is a “let's connect further” moment, not a website tour. A booking link like a Calendly page removes a whole email exchange of back-and-forth scheduling, a vCard download saves someone from retyping your contact details, and a LinkedIn profile is a natural next step after an introduction.
Whichever you pick, put the same link as visible text directly beside the code. Not everyone will scan it, and plenty of people reading on a laptop with no second device handy will just click the text instead.