Minimum Size of a QR Code

Minimum QR Code size

Recommendation: A QR Code that encodes up to 72 characters (which is the length of a typical URL) should be printed in a size of 20×20 mm (0.79x0.79″) when scanned from a distance of 20cm (7.9)

Surface Scan Distance QR Code Size
A4 e.g. Magazine 20cm 20mm x 20mm
A3 e.g. Poster 1m 100mm x 100mm
3x4m e.g. Billboard 10m 1m x 1m

Before applying this recommendation please consider the following tips. If you you are printing a designer QR Code please also read Printing QR Codes with Colors.

Consider the scanning distance

Rule of the thumb: the ratio between scanning distance and the QR Code size is 10:1. So if you want to scan a QR Code from 10 meters (390″), the size of the QR Code should be 1 square meter (39″). Or if you print a QR Code on a post card, the user will scan the QR Code from a distance close to 15cm (5.9″). Applying the rule the QR Code may have a minimum size of 15mm (0.59″).

Quiet Zone around the QR Code

Quiet Zone QR Code margin

Have at least a Quiet Zone of 4 Units arround your QR Codes.

 

If you print a QR Code always leave a quite zone (margin) around the QR Code. We recommend to have 4 units of white space arround your QR Code to ensure it can be read by any QR Code reader.

Use shorted URLs

How much information do you want to store in the QR Code? The less the better. Use shortened URLs instead of a long URL. The shorter the URL the less units a QR Code will contain and there for can be plotted smaller.

A shortened URL with up to 17 characters will produce a QR Code with 21×21 units. Encoding a longer URL with up to 72 chars will result in a QR Code with 35×35 units.

QR Code with a long URL

http://qrd.by/what-a-long-url-you-may-consider-shortening-it

QR Code with tiny URL

A shorted URL: http://qrd.by/t

 

Use scale able vectorized QR Codes

It is important create QR Codes in Vector format. If you are plotting QR Codes from a .png or .jpg source, they may get blurred and cannot be read anymore.

Create optimized QR Code

Smallest QR Code Contest

Download the QR Code Contest .pdf document and print it out. It contains various QR Codes in different sizes. In theory you will be able to scan QR Codes with a size of 5mm (0.19″), depending on your printer and your scanning device. If you are able to scan QR Codes in an even smaller size, please let us know!!!

Devices that scan QR Codes < 4mm (0.16”)

Huawei Ascend XT H1611 (3mm QR Code was printed on a Canon MF4320 laser printer with 600dpi)

Devices that scan QR Codes < 5mm (0.19”)

Apple iPhone 5
Google Nexus 5
HTC One
Huawei Ascend Mate 7
LG D802, D959
MicroMax Q450
Nokia Lumia 635
OnePlus One
Samsung GALAXY ACE 3, GALAXY Note 4 Edge, GALAXY S4, GT-I9500, SGH-I317
Sony Xperia Z1
Xiaomi MI 2SC

Peter

Peter is the founder of the QR Code Platform qrd.by. He is a QR Code enthusiast and consults agencies with his expertise to launch successfull QR Code campaigns. Get in touch with him on:


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4 thoughts on “Minimum Size of a QR Code

  1. Patrick

    Hey Peter,

    A Huawei H1611 with the QR scanner built into UCWeb’s “UC Browser” was able to scan the 3mm code printed by a Canon MF4320 laser printer using default settings (I believe it was scaled down slightly to fit the page margins). Don’t know if that’s still interesting….

    Reply
    1. Peter Post author

      Hi Patrick,
      thank you so much for posting this new record 🙂

      The Canon MF4320 laser printer has 600dpi and therefor can print up to 70 pixels within 3 millimeters. The QR Code is only 21×21 pixels so in theory, there is still room for even printing smaller QR Codes.
      The back camera of the Huawei Ascend XT (H1611) has 7 MP (3264 x 2448) and an autofocus function.

      I have updated the hall of fame with your device,
      Best Regards,
      Peter

      Reply
  2. rabema

    Hello sir,
    I live in Madagascar and I would like to purchase label QR code 20mm*20mm.
    May you advise me a wholesaler for that?
    Thanks a lot

    Reply
  3. Peter Post author

    Hello Rabema,

    goto to our website and create a QR Code. You can then purchase a QR Code on different materials and edit the size of the QR Code in our shop.

    Reply

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