QR Code Print Size: How Many Centimeters? (Minimum Size by URL Length and Scanning Distance)

How large should you print a QR code on a flyer or business card? I made QR codes for three URLs of different lengths, ran a scan test, and summarized minimum sizes by distance plus how colors and transparent backgrounds affect scanning.

When you put a QR code on a flyer, business card or store sign, the tricky part is how many centimeters it needs to be for phones to scan it reliably. Too small and it looks clean but won't scan; too large and it eats up space. I made QR codes for three URLs of different lengths with PicLever's QR code generator, counted their modules, and ran a scan test that simulates a phone camera to find the minimum print size. I also tested colors and transparent backgrounds.

Bottom line: QR code size depends on URL length and scanning distance. At 30cm, a short URL (20 characters) needed at least 2.1cm, and a long URL (115 characters) needed at least 3.8cm. For a safety margin, print it at 1/10 of the scanning distance or larger (3cm at 30cm, 10cm at 1m), and keep the URL short. A transparent-background QR code placed on a photo failed all 10 scans.

Longer URLs make denser QR codes

Even at the same saved size, a longer URL holds more data, so the code has more modules (squares). More modules means smaller squares, so the code has to be printed larger to scan from the same distance.

QR code module count and minimum print size at 30cm for 20-, 47- and 115-character URLs

URL	Characters	Modules	Min. size at 30cm	Min. size at 1m
Home page	20	25 × 25	2.1cm	7.0cm
Tool page	47	33 × 33	2.8cm	9.3cm
URL with tracking (utm) parameters	115	45 × 45	3.8cm	12.7cm

In the scan test, every code read 10 out of 10 times once each module was about 2.6px or larger on screen, regardless of URL length. So the long URL, with 1.8× as many modules per side, needs to be printed 1.8× larger.
These are minimum sizes with no margin for error. Allow about 1.5× for lighting, shaky hands and ink spread. At 30cm, around 3cm for a short URL and 6cm for a long one is safe.
Sizes refer to the black code area. Keep a white margin of about 4 modules around it—cropping the margin makes codes much harder to scan.

Recommended print sizes by use

Use	Scanning distance	Recommended size (short URL)
Business cards · product labels	15–20cm	2–3cm
Flyers · menus · notices	About 30cm	3–4cm
Store entrance posters	1m	10cm or more
Banners · signs read from afar	2m or more	20cm or more

For long URLs, go 1.5–2× larger than these sizes. Removing long tracking parameters or using a shorter URL makes the same size scan much more easily.

Colors and backgrounds: what gets in the way?

I scanned the same QR code 10 times each, changing only the color and background.

Scan results for a purple QR code and a transparent-background QR code on a light solid color and on a photo

Combination	Scans
Purple code · white background	10/10
Transparent background · on a light solid color	10/10
Transparent background · on a fall foliage photo	0/10

Dark code colors are fine. A color with strong contrast against white, like PicLever's purple, scanned just as well as black.
Transparent backgrounds depend on where you place them. On a light solid color there was no problem, but on a patterned image like a photo, the photo showed through the white modules and the code never scanned. When placing a code over a photo or dark background, download it with a white background.
Light code colors (yellow, pale gray) or inverted codes (light code on a dark background) can't be read by some apps, so it's safer to avoid them.

Test setup

Samples: three 1024×1024px PNGs made with the PicLever QR code generator (20-, 47- and 115-character URLs). The error correction level was M (recovers from about 15% damage).
Scan test: each code was scaled down to several sizes, then blur, noise and JPG compression were added to mimic a phone photo, and each was read 10 times with an open-source decoder (ZXing).
Centimeter conversion assumes a phone camera field of view of about 70° and a 1280px-wide frame for scanning. Actual results vary with the phone, lighting and print quality, so print one at the real size and scan it before a full print run. · Tested 2026-09-29
Photo: Fineas Anton / Unsplash

Making a print-ready QR code with PicLever

In the QR code generator, choose URL · Text and enter the address starting with https://. Keep the URL as short as possible.
Choose Black or Purple for the code color and White for the background. Use Transparent only when placing the code on a light solid color.
For print shops or large enlargements, choose Download SVG or Download PDF—edges stay crisp at any size. For documents or chat apps, Download PNG is enough.
Print one at the size you plan to use and scan it with a phone from the real viewing distance.

For step-by-step instructions, see the QR code guide.

FAQ

Q. What size should a QR code on a business card be?
For a short URL, 2cm or more per side—about 2.5cm including the margin. For a long URL, go 3cm or larger, or shorten the URL.

Q. Can I put a logo in the middle of a QR code?
QR codes can recover from partial damage, but covering part of the code makes scanning less reliable. If you add a logo, test it with several phones before printing.

Q. Can I change the URL of a QR code I've already printed?
QR codes made with PicLever store the URL directly in the code, so it can't be changed. If the URL changes, make a new code and reprint.