tidy qr STATIC CODE STUDIO
Menu +

Technical reference

Minimum QR print size: a practical method

There is no single minimum print size that guarantees a QR code will scan. Use the expected distance and the actual module grid to choose a starting size.

Illustrative distanceDistance ÷ 10Starting width
20 cm200 mm ÷ 1020 mm
50 cm500 mm ÷ 1050 mm
100 cm1000 mm ÷ 10100 mm
Calculated examples from REHAU's distance rule. Check print density and actual conditions before using these sizes.

Combine distance and density

REHAU's design guideline uses a distance-to-size ratio of 10:1. Treat this as a practical starting rule, not a promise about every phone. A reader held close to a handout has a different job from a visitor scanning a poster behind glass.

The number of modules also matters. If you place a denser symbol inside the same physical square, each module becomes smaller. DENSO WAVE recommends at least 4 printer dots per module for stable printing, while also noting that the scanner has its own reading limits.

Reserve the complete footprint

Include the quiet zone when measuring the code. Standard QR needs a blank border at least 4 modules wide on every side. A layout that allocates only the black-and-white symbol area can accidentally consume the margin with nearby text or a decorative frame.

The Tidy QR calculator takes the larger of the distance estimate and the print-density floor, then rounds up to a whole printer dot per module. Its result is a starting width for the complete code, including the border. The assumptions and inputs stay visible so you can review them.

Test at the place it will be used

Print a proof at actual size, place it on the intended surface and stand where a user can safely stop. Test the normal lighting and angle. If scanning is hesitant, increase the code size, simplify its design or shorten the payload.

A high-resolution export cannot compensate for a small printed footprint. Likewise, a larger footprint does not fix a cropped quiet zone or a wrong destination. Treat image quality, physical size, payload and destination availability as separate checks in the release process.

Put this into practice in the QR generator, then inspect the decoded payload before printing.

Sources

Last checked: . Examples are illustrative inputs, not measured results.

  1. QR Code Guideline, REHAU Brand Management. Checked 2026-10-29.
  2. Determining the QR code area, DENSO WAVE. Checked 2026-10-29.
  3. Setting the module size, DENSO WAVE. Checked 2026-10-29.
  4. QR Code versions and information capacity, DENSO WAVE. Checked 2026-10-29.