The Complete Guide to QR Code Sizes:
Print, Digital & Scanning Distance

QR Code Size — Frequently Asked Questions

What is the minimum size for a QR code?

The minimum for a standard QR code is 2.0 × 2.0 cm (0.8 × 0.8 inches), and that assumes ideal conditions — perfect contrast, a close viewing distance, a short URL. For reliable scanning we recommend 2.5 × 2.5 cm minimum for print and 150 × 150 pixels for digital. (The 1.0 cm figure quoted in some guides is Micro QR, a separate symbology standard QR generators do not produce.) Try our free QR code generator to create codes at the right size.

What size should a QR code be?

Size depends on scanning distance. Use the 10:1 rule: QR code size = scanning distance ÷ 10. For a typical flyer (20–30 cm viewing distance), use 2.0–3.0 cm. For a poster (50–100 cm distance), use 5.0–10 cm. See our cheat sheet for specific use cases.

Are QR codes different sizes?

Yes! QR codes come in 40 different versions (Version 1–40). Version 1 is the smallest (21 × 21 modules), and Version 40 is the largest (177 × 177 modules). More data = larger version = larger code size. Dynamic QR codes use shorter URLs, enabling smaller versions and smaller printable sizes.

What is a version 40 QR code size?

Version 40 is the maximum capacity QR code with 177 × 177 modules. At a standard 2 mm per module, a Version 40 QR code would be 354 × 354 mm (14 × 14 inches). However, most use cases never need Version 40 — typical codes are Version 1–10 (21–57 modules).

Can QR codes be any size?

Technically yes, but practically no. QR codes can be resized without losing function, as long as you maintain the 1:1 square aspect ratio, each module stays at least 1–2 mm (print) or 1–3 px (digital), and contrast is maintained. Scaling too small causes scanning failure. Our custom QR code generator exports SVG, which you can scale to any final size without redrawing the code.

What’s the pixel size of a QR code?

There is no single pixel size — it follows from the module count and where the code is displayed. The code needs a few pixels per module plus the 4-module quiet zone on each side, which puts the practical floor around 150 × 150 px; 200–500 px is the comfortable range for most screens. Per-channel minimums and recommended sizes for email, social, web, notifications and small screens are listed in the digital sizes section above.

What’s the optimal QR code size?

There is no universal optimal size — it depends on where the code will be scanned from. Once the 10:1 rule gives you a starting width, the binding constraint is module size: keep each module at roughly 1 mm or more in print, and budget the 4-module quiet zone before you fix the final dimensions. Where the surface allows it, go above the minimum rather than at it — the minimums assume good contrast, a flat surface and an unhurried scanner, and real conditions rarely give you all three. The size chart lists tested dimensions per use case.

Can I resize a QR code without losing quality?

Yes — a QR code is defined by its grid of modules, not by a fixed pixel count, so it can be redrawn at any size. What decides quality is the file you export. In the QRKIT create flow, SVG is the only true vector download (the PDF there is a raster image placed on a page). Downloading a saved code from your dashboard gives you true-vector SVG, PDF and EPS, none of which are resolution-clamped. Whichever you use, keep the 1:1 aspect ratio and at least 1 mm per module in print. Avoid JPG, and avoid scaling up a small PNG.

Does QR code version affect the size?

Yes, but only indirectly. The version sets how many modules the code has per side, and the version is chosen automatically from how much data you encode. It does not set a physical size — you do, when you choose how big each module is printed. That is the part that catches people out: a higher version at the same printed width means smaller modules, and modules that fall below roughly 1 mm are what actually breaks scanning. So if your data grows, either print the code larger or encode less of it.

What is a QR code module?

A module is one tiny square in the QR code grid. QR codes are made of a matrix of black and white modules. The more modules a code has (larger version), the more data it can store. Module size when printing (e.g., 2 mm × 2 mm) directly determines the physical QR code size.

Why use dynamic QR codes for sizing?

Dynamic QR codes encode a short link (for example qrkit.to/abc123) instead of a long destination URL. Fewer characters means a lower QR version and fewer modules per side, so at the same printed width every module is physically bigger — or you can print the code smaller and still have it scan. That is a real advantage on space-constrained surfaces like business cards, labels and small product packaging. How much you gain depends on how long your original URL is; a destination that is already short has little to save.

How is QR code size measured?

QR code size is measured in centimeters or inches for print, and pixels for digital. It’s always measured as width × height (and since QR codes are square, both dimensions are the same). The formula: modules × module size = total code size.

What is the smallest a QR code can be printed?

The smallest reliably scannable printed QR code is about 2.0 × 2.0 cm (0.8 in) for a standard code. Below roughly 1 cm, individual modules become too small for most phone cameras to resolve. The practical minimum print size for most campaigns is 2 cm, with 2.5 cm as the recommended safe minimum.

Do QR codes have to be square?

Yes. Standard QR codes are always square with a 1:1 aspect ratio — the finder patterns in three corners require it, and stretching or skewing the code breaks scanning. The one exception in the specification is rMQR (rectangular Micro QR), a niche variant for narrow spaces like cable labels that standard QR generators — QRKIT included — do not produce. For normal use, keep the data matrix square; you can still round the frame or background around it for design without changing the code’s shape.

Can a QR code be a circle?

The scannable data matrix itself must stay square — a QR code cannot be a true circle without breaking the finder and alignment patterns that cameras use to decode it. What you can do is place the square code inside a circular frame or on a round background, or use rounded module and eye styles for a softer look. The code stays square; only the surrounding design changes.

How big should the quiet zone around a QR code be?

The QR code standard, ISO/IEC 18004, requires a quiet zone of at least 4 modules of clear space on every side of a standard QR code — about 8 mm when each module is 2 mm. Micro QR codes require a 2-module quiet zone. Without this margin, scanners struggle to detect the code boundary and scans fail. The quiet-zone rule is explained in full in the sizing section above.

Why won’t my QR code print correctly?

Almost always because a raster file was enlarged past its pixel count — a small PNG or a screenshot stretched to the printed size has no extra detail to draw, so every module edge softens. Printing from a vector file removes the problem, because it is redrawn at the press resolution instead of being scaled up. The five causes, and how to tell which one you have, are covered in why printed QR codes look blurry above.

How do I increase the resolution of a QR code?

Regenerate and re-export it at the larger size — you cannot add resolution to a file that does not have it, and upscaling an existing PNG only invents soft pixels. In QRKIT, downloading a saved code from your dashboard offers PNG at 512 px, 1024 px, 2K (2048 px) and 4K (4096 px); Free is capped at 1024 px and the 2K and 4K steps are on the paid plans. The better answer for anything headed to print is a vector download instead: a saved code comes as SVG, PDF or EPS on any paid plan, and vector formats are never resolution-clamped.

What resolution does a QR code need for print?

There is no single number that guarantees a scan, because resolution only means something once the printed width is fixed. What decides it is the printed module size — printed width divided by modules per side — together with the reading distance and the contrast. Set the printed dimensions first using the size chart and the 10:1 rule, then export at a resolution that comfortably covers them. Printing from a high-resolution QR code file is the safe route for raster, but a vector download removes the question entirely: it is redrawn at whatever resolution the press runs at.

Should a QR code be a PNG or JPG?

Use SVG when you can — it’s vector, so it scales to any size with no quality loss, which matters most for print. If you need a raster image, use PNG: it keeps sharp black-and-white edges. Avoid JPG for QR codes — its compression softens module edges and can introduce artifacts that cause scan failures, especially at small sizes. In short: SVG for print and scaling, PNG for web and email, and skip JPG.