PostNord app

send letter with digital stamp

How we turned a 12-character code into a simple alternative to physical stamps.  Making PostNord's digital stamps feel effortless, not confusing.

The Complexity Challenge

PostNord wanted to let people buy stamps digitally instead of hunting for a store. Simple idea, complex execution.Users needed to write a 12-character code in a very specific format (0000 0000 0000 stacked vertically) on their envelope, plus additional text for priority mail and country codes for international letters.

Get the format wrong, and your letter won't be processed. Make the instructions too long, and people will just walk to the nearest store instead.

The challenge

 • 12-character code with strict formatting rules
 • Different requirements for domestic vs international mail
 • No API feedback to know if codes were actually used
 • Broad target audience from casual to frequent letter senders

The Solution

I created visual step-by-step guides showing exactly how to write codes on actual envelope illustrations. Added a "My Digital Stamps" management list (missing from original brief) to track active/used stamps.

Key features:

 • 3-step onboarding (domestic, international, posting)
 • Visual envelope examples with code placement
 • Manual "mark as used" tracking
 • Clear domestic vs international formatting

Result

Successfully launched without user confusion complaints - a major win for such a complex feature.

Learning:

Often the most important design work is identifying what's missing from the original brief.