LinkedIn QR code on a business card.

A LinkedIn address like linkedin.com/in/jordan-hale-example encodes to a 33×33 grid at error correction M. At GS1’s minimum module of 0.396mm, the code and its four-module margin need 0.64 in (16.2mm): 32% of the card’s height. At the 0.495mm target it is 0.8 in (20.3mm). Most designers settle between the two, around 0.75 inch, which leaves the rest of the side for your name.

The margin is part of the size. ISO/IEC 18004, the QR code standard, asks for four modules of blank space on every side, and a designer trimming it to line the code up with the card’s edge is the commonest way a good code stops scanning. If your address is long, shorten your custom URL first: fewer characters, fewer modules, a smaller code.

Use the SVG for print. It is a vector, so the printer can scale it to any size without blur. LinkedIn’s app saves its code to your photos as a screen image, made for sharing from a phone rather than for a print shop.

The back, on its own. A code on an uncluttered side reads as an invitation, and leaves the front to your name and title. Put three or four words under it, “Scan to connect on LinkedIn”, so people know what it opens before they lift their phone.

Dark on light. Phone cameras read dark modules on a light ground. A reversed code (light on dark) or a pale brand color is where most failures come from. Black or your darkest brand color on white or cream is safe.

No logo in the middle. A logo covers modules, which spends the error correction meant for scuffs and creases. If you add one anyway, raise the error correction and check the result with the size checker.

Proof, then print. Order or print one proof on the stock you will use and scan it with two different phones, from the distance people will hold it, before you order the box.