1. Start From the Module
Packaging QR sizing begins with module width, not overall size. Use at least 0.5 mm per module on coated stock and more on corrugated. Our [QR size calculator](/qr-size-calculator) helps determine the total symbol dimensions based on payload and module size.
2. Worked Example
A Version 2 code has 25 modules. Add an 8-module total quiet zone (4 on each side) and you have 33 modules across. At 0.5 mm per module:
$$33 \times 0.5 = 16.5\text{ mm}$$
A Version 3 code needs (29 + 8) x 0.5 = 18.5 mm. Generate and test with our [URL QR code generator](/url-qr-code-generator).
3. Surface Considerations
* Flexo on kraft or corrugated: 0.85 mm modules or larger.
* Curved or shrink-sleeve surfaces: place on the flattest area using our [QR placement guide](/qr-placement-guide).
* Avoid placing across folds, seams, or glue flaps.
* Verify scannability with our [printed QR tester](/printed-qr-tester) on actual product samples.
4. Verify
Run a print proof and grade it, or at minimum scan on an older budget phone with a [QR scanner](/qr-scanner). Understand how print processes affect quality using our [error correction simulator](/error-correction-simulator).
Putting this into practice
Start with the smallest real test you can run. Generate the code, print it at the exact size you plan to use, and scan it with two different phones in the lighting where it will live. Check that the destination page loads quickly on a mobile connection and that the call to action next to the code tells people what they will get. If anything feels slow or unclear, fix it before you print a full batch, because reprints cost more than a short test. Keep a note of the size, material, and placement that worked so the next batch starts from a proven setup.
Common mistakes to avoid
The most common mistakes are easy to avoid once you know them. Long payloads make modules tiny, low contrast makes edges hard to read, and text placed too close to the border eats the quiet zone the scanner needs. Covering a corner finder pattern with a logo or a sticker breaks detection entirely, and a code placed behind glare or on a curved surface fails even when the print is perfect. Review each of these points on a proof copy, and treat any failure as a reason to adjust the design rather than a reason to blame the scanner.
Quick checklist
- Keep the payload as short as practical so modules stay large.
- Keep dark modules on a light background with strong contrast.
- Leave a clear quiet zone on all four sides of the symbol.
- Test the printed code at the real viewing distance and lighting.
- Confirm the destination page loads fast on a phone.
- Recheck the code after any change to the link, design, or placement.
