Terence Eden personal blog
Why are QR Codes with capital letters smaller than QR codes with lower case?
Take a look at these two QR codes. Scan them if you like, I promise there's nothing dodgy in them. Left is upper-case HTTPS://EDENT.TEL/ and right is lower-case https://edent.tel/ You can clearly see that the one on the left is a "smaller" QR as it has fewer bits of data in it. Both go to the same URl, the only…
- Points
- 319
- HN comments
- 123
- Submissions
- 1
- Cited by
- 3 commenters
Math & AlgorithmsSoftware Engineering2025
On Hacker News
| Submitted | Title on HN | Points | Comments |
|---|---|---|---|
| Feb 23, 2025 | Why are QR Codes with capital letters smaller than QR codes with lower case? by todsacerdoti | 319 | 123 |
Cited in comments
Linked from 3 Hacker News comments by 3 different people, from May 2025 to May 2026.
Most recent:
- keane · May 5, 2026
- gregsadetsky · Nov 7, 2025
- fragmede · May 11, 2025
