The standard business card size across the United Kingdom is 85 × 55 mm (standard credit card format). That gives your graphic designer roughly 4,675 square millimetres of real estate per side to present your name, title, company, phone number, email, and social links.
Adding a QR code is the most efficient way to get your contact details or portfolio into someone’s phone. But shrink that square too much, or overload it with data, and you hand out 500 pocket-sized frustrations that camera apps ignore.
Standard UK dimensions, bleed, and safe margins
Commercial UK printing houses (such as Solopress, Moo, or printed.com) require a 3 mm bleed on all four sides. That means your artwork document is setup at 91 × 61 mm and trimmed down to 85 × 55 mm.
Guillotine cutting blades have a mechanical tolerance of ±1 mm. For that reason, keep all crucial elements—especially QR codes—at least 4 mm inside the trimmed edge (the “quiet margin” or “safe zone”). A QR code placed right up to the trim line risks having its outer finder pattern clipped by the cutter, immediately rendering the entire card useless.
The 20 mm minimum floor
When held in the hand, a recipient holds a business card approximately 15 to 25 cm from their phone camera. Applying the established 10:1 viewing ratio suggests a minimum size of 15 to 20 mm.
In practice, 20 mm (including the quiet zone) is the absolute minimum floor for a simple short link. If you are encoding a full vCard contact record, 23 mm to 25 mm is strongly recommended.
| Payload type | Typical version | Grid modules | Recommended card print size |
|---|---|---|---|
Short URL (e.g. https://studio.co.uk) | Version 2–3 | 25–29 | 20–22 mm |
| URL with UTM campaign tags | Version 5–7 | 37–45 | 24–26 mm |
| Minimal vCard (Name, mobile, email) | Version 6–8 | 41–49 | 23–25 mm |
| Full vCard (Title, address, company, web) | Version 10–12 | 57–65 | 26–30 mm (or avoid) |
The module size rule: keep it above 0.4 mm
A QR code is not just a picture; it is a matrix of microscopic black and white squares called modules. When commercial offset or digital printers lay ink on paper, ink bleeding (dot gain) slightly expands the dark modules into the white spaces.
If each individual module measures less than 0.38–0.40 mm on the physical card, camera sensors struggle to resolve the grid lines, particularly in dim conference halls or under warm restaurant lighting.
To check your design before printing: divide the intended physical code width (in millimetres) by the total number of modules across the code (including 8 modules for the quiet zone). If the answer is below 0.40 mm, your code is too dense for that size. Shorten the payload or allocate more physical space.
On an 85 × 55 mm business card, there is simply not enough room for both a logo and a reliable QR code. A logo forces the error correction to level H (30%), which increases module density by up to 50%. Print your logo in crisp vector elsewhere on the card, and leave the QR code uncluttered.
Print finishes: matte, gloss, soft-touch, and foil
The paper stock and protective lamination you choose will make or break your code's scannability:
- Matte or uncoated stock (Recommended): Absorbs light evenly without specular reflections. This provides the most dependable scanning surface under all lighting conditions.
- Soft-touch lamination: Gives a premium velvety texture with zero glare. Works exceptionally well with camera lenses.
- Gloss lamination: Under direct spotlighting or sunlight, high-gloss laminate bounces a sharp white reflection straight back into the camera lens, whiting out key modules. If using gloss, increase your QR code size by at least 2–3 mm.
- Hot metallic foil & Spot UV: Never apply gold, silver, or holographic foil to the QR code itself. Foils reflect ambient light irregularly, blinding optical sensors. If applying spot UV, restrict it to your branding on the opposite side of the card.
Prepress artwork rules: 100K vs rich black
When sending artwork to commercial print, black elements can be set up as either 100% Key (0C / 0M / 0Y / 100K) or Rich Black (e.g. 40C / 30M / 30Y / 100K).
Always output your QR code in 100% pure Black (K). If you use a four-colour Rich Black, even a fraction of a millimetre in printing press registration misregistration will cause coloured cyan, magenta, or yellow halos around individual modules, blurring the sharp edges essential for scanning.
Always export your code as vector SVG or EPS directly from the generator, rather than embedding a 72 DPI screen screenshot.
Print preparation checklist
- QR code size is at least 20 mm wide (23–25 mm for contact details).
- Artwork safe zone has at least 4 mm distance from trimmed edges.
- Module size is equal to or greater than 0.4 mm physically.
- Quiet zone margin is preserved completely intact.
- Artwork uses 100% pure black ink (K) on a clean white background.
- Laminate is non-reflective matte or soft-touch velvet.
- A 100% scale physical paper proof has been printed and tested with real smartphones.
Questions before you print
Can I print a QR code at 15 mm on a business card?
While an iPhone 15 Pro under perfect studio lighting might read a 15 mm code, older or budget Android phones will repeatedly fail. In real networking environments with poor lighting, 20 mm is the realistic minimum.
Should the QR code be on the front or the back of the card?
Putting the code on the back is best practice. It leaves the front clean for your name, title, and brand identity, while giving the back enough space to print a generous 24 mm code with a clear call to action like 'Scan to save contact'.
What format should I send to my commercial printer?
Always provide vector SVG or PDF. Vector formats retain infinite sharpness regardless of print DPI. If using raster PNG, ensure it is at least 600 DPI at physical print dimensions.
Can I invert the colours (white QR code on black card)?
Technically some modern cameras can invert scans, but standard ISO specifications require dark modules on a light background. Inverted codes cut scan reliability by roughly 30%. Stick to dark on light.
Why does my printed business card open a dead link?
Many online generators create dynamic codes that stop working once a free trial finishes. Always use static QR codes generated in your browser that never expire.
Related: Learn what fields to encode in vCard QR codes for networking, see our master guide on print sizes for all media, and discover how to troubleshoot codes that fail to scan.
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