QR COVE BLOG
What size should a QR code be for print?
A QR code that scans instantly on your screen can fail on paper, and the reason is usually size. Too small for its viewing distance, too dense for its print, or squeezed against a border with no breathing room, and the camera cannot separate the pattern. This guide gives you a practical rule for choosing a print size, sizes for the jobs people actually print, and the mistakes that ruin otherwise good codes.
The 10x rule, explained
As a rule of thumb, comfortable scanning distance is about ten times the width of the code. A 1-inch (2.5 cm) code scans comfortably from about 10 inches away, which suits a business card or a table card held in the hand. A 4-inch (10 cm) code works from around 40 inches, about the distance of a poster viewed by someone standing in front of it. A code on a shop window meant to be read from the pavement needs to be larger again, in proportion to that longer distance. Treat the rule as a starting estimate, not a guarantee: older phones, dirty lenses and poor light all shrink the comfortable range, so build in margin and print slightly larger when the layout allows.
Size by use case
- Business cards: at least 0.8 to 1 inch (2 to 2.5 cm) square on matte stock, with short contact details so the pattern stays open.
- Flyers and table cards: 1 to 2 inches (2.5 to 5 cm) for arm’s-length scanning indoors.
- Posters and signs: 3 to 5 inches (8 to 13 cm) for viewers a few feet away; larger for across a room.
- Banners and shop windows: 6 inches (15 cm) and up, sized to pavement distance, and tested from the exact spot where passers-by will stand.
- Product packaging: 0.8 to 1.2 inches (2 to 3 cm) on a flat area. Curves distort the pattern, so avoid wrapping a code around a bottle or tube.
Quiet zone and contrast rules
Keep at least four empty modules around the symbol. That blank margin, called the quiet zone, is how a camera finds the code and knows where it ends, and captions, borders or artwork inside it cause misreads. On a coloured background, print the code on its own white square rather than hoping the camera copes. Strong dark-on-light contrast scans most reliably: black or dark navy on white is the safest choice for print, while pale colours, gradients and reversed light-on-dark designs fail on many phones. If brand colours matter, use them in the surrounding design and keep the code itself dark on light.
Vector (SVG) vs PNG for print
For professional print, use SVG. Vector art scales without blurring module edges, so the same file works on a business card and a banner. PNG is useful when a design tool needs pixels, but never enlarge a low-resolution PNG: blurred edges merge neighbouring modules and break scanning. At 300 dots per inch, a 1024-pixel image is about 3.41 inches wide, which describes resolution, not a scanning guarantee. Keep the artwork square and never stretch it to fit a rectangular space. When you need many codes for a print run, the bulk generator makes them in one batch, and each still downloads as a clean file you can hand to a printer.
Common mistakes
- Inverted colours: light modules on a dark background fail on many phones. Keep it dark on light.
- Tiny codes: a dense code printed small for a long URL is the classic failure. Shorten the content or enlarge the symbol.
- Glossy glare: lamination and glass reflect ceiling lights into the camera. Use matte stock and test under real lighting.
- Logos that cover too much: a large centre logo hides modules error correction cannot restore. Test the logo version on several phones, or ship the plain version.
- No proof: printing thousands without a physical test is how bad codes ship. Print one at final size, on the real material, and scan it from the real distance.
Proof before you print hundreds
Print at the final size and on the intended material, then test under realistic lighting with several phones, including an older one. Scan from different angles and from the actual viewing distance, not from six inches away at your desk. If scanning is slow, enlarge the symbol, simplify the encoded content, remove the logo or improve contrast before ordering more copies. Reprinting a hundred cards is cheap; reprinting ten thousand posters is not. Our print size calculator gives a planning estimate for common uses, and the full print size guide covers the details.
Frequently asked questions
What is the smallest size a printed QR code can be?
For hand-held items, about 0.8 to 1 inch (2 to 2.5 cm) is a practical minimum for a short code in good light. Denser codes, poor light and older phones all need larger sizes.
How far away can a QR code be scanned?
Roughly ten times its width: a 1-inch code from about 10 inches, a 4-inch code from about 40 inches. Build in margin for older phones and poor light.
Should I print QR codes as SVG or PNG?
SVG for professional print and large sizes, because vector art scales without blurring. PNG only when the tool needs pixels, and never enlarged from a low resolution.
Why does my printed QR code fail while the screen version works?
Usually size, glare, a missing quiet zone or low contrast on the printed piece. Proof on the real material, at the real distance, under real lighting.