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How does the QR code technology work?

QR code is an image that contains the text. This text is recognized by QR code scanners and according to some predefined text marks the scanner can automatically display a web page or start playing a video. The technical details can be found on en.wikipedia.org/wiki/QR_code or https://www.denso-wave.com/qrcode/index-e.html.

What are error correction levels good for? What is QR Reliability?

QR codes were originally meant to be used outside. For this reason, 4 error correction levels were defined to improve the resistance of QR codes. With the lowest error correction level (L) QR code can lose up to 7% of its surface, with the medium error correction level(M) QR code can lose up to 15% of its surface, with the quality error correction level(Q) QR code can lose up to 25% of its surface and with the highest error correction code QR code can lose up to 30% of its surface. iQR codes sets the high error correction automatically when the user inserts the logo.

How does the highlighting control points improve readability?

QR code scanner needs these control points (alignment patterns) to recognize a QR code in a picture. Every time there are 3 control points visible that make the QR code successfully recognized by the QR scanner. iQR codes recognize these control points as primary points. Besides the primary points, there are also smaller control points that appear with more text. These are called secondary control points. To make sure a QR code is recognized we recommend using darker colors for primary and secondary control points.

How to make sure that the QR code is readable?

We did several tests and all scanners failed if one of the primary control points was damaged or covered. To prevent this do not put any image over these control points. The most popular iPhone QR reader  does not recognize any QR code if the bottom right control point is covered or damaged. iQR codes for this reason does not allow to change the position of the logo. It is also important to use darker colors for points and brighter colors for the background.

What colors do we recommend to choosing?

We recommend using darker colors for code and brighter colors for the background. This rule applies to the gradients as well.

How to begin using iQR codes?

  1. Open our application.
  2. Select one of the predefined tabs (Phone, SMS, Email, Map, WWW, Contact, Calendar, Payments, Wifi, or Plain text).
  3. Write some text into fields.
  4. (OPTIONAL) Customize the look of QR code by selecting the "Customize" tab. We recommend you to read our tutorial "How to make beautifully designed iQR code" where you can find related information.


How to customize QR code?

The most right tab item allows you to select several customization options. You can change the predefined look of the QR code by selecting one of the pixel styles. At each pixel style, you can modify the roundness of pixels by moving the corner radius slider. Another option is to choose color or gradient. At this tab, you can also select "Drop shadow" options. If you customize your QR code we highly recommend highlighting control points to make sure your QR code is correctly recognized by most QR code scanners. With the "Pixel resolution" slider you can increase the size of the QR code. The current size with borders is displayed in the bottom-right corner. More information can be found in our tutorial "How to make beautifully designed iQR code". Don't forget to test your new QR code using various popular QR code scanners.

What QR code scanners do we recommend using for testing purposes?

Apple iPhone
Camera app (Settings->Camera->Scan QR Codes->Enabled)
QR Reader for iPhone
Android
Camera app (Samsung, Xiaomi, OnePlus)
QR & Barcode Scanner
Google Lens
Barcode Scanner+ (Plus)


How to avoid the wrong usage of QR codes?

A QR code that contains a WWW link should not be used in places where there is no network or internet coverage. The content on the web will be accessed by a mobile browser. Make sure it is correctly displayed on a mobile browser. Use darker colors for your QR code and make sure your code is readable by the most popular QR scanners.

Who uses QR codes?

According to 2011 statistics, QR codes were mostly used in print media to enhance the advertisement experience or to simply direct readers to related discussions. QR codes were also extensively used on business cards. They have become prominent in restaurants to offer contactless menus.

What is URL Batch processing?

URL Batch Processing generator saves your time when you need to create multiple customized QR codes. With this In-App feature, you can insert up to 1 000 web links. After hitting the "Execute" button iQR takes care of the rest. If you do not like the pre-filled filenames you can copy your own from textile. (Plain text with a newline or any spreadsheet). For more detailed info you can see URL Batch processing in action in our tutorial section.

How to create many QR codes from Excel or Spreadsheet?

In addition to process URLs, our batch processing generator can generate many specialized QR code types such as wifi networks, meCard contacts, emails, crypto-wallets, or locations. With iQR codes, you will get access to Google/Excel templates where you replace cells with your data and the template will create QR formatted text which you paste back to iQR codes. For more detailed info you can see QR Batch processing with templates in action in our tutorial section.

How to create a QR code with a file (Restaurant menu, PDF, MP3, Contact with Image...)?

Document files with images or songs are very large to be contained inside a QR code. The standard industry practice is to upload your file to a file cloud hosting such as Google Drive, Dropbox, or Box (Microsoft) and get a shareable link to the file. You can paste your shareable link to the "WWW" tab to take advantage of our dynamic QR code feature and to beautify your QR code. We recommend you to read our tutorial "How to generate a PDF QR code" where you can find related information.

How to create universal QR code for the App store (iPhone app/iPad app/iOS app/Mac app/Android app/Amazon app/Microsoft app)?

We recommend using onelink.to which can create these universal links.