Minimum qr code size for a business card. Space efficiency of 2D Data Matrix and QR Code barcodes. Testing and testing again

Each smartphone is different and has different camera specifications. Modern smartphones should be able to read them. First of all, you need to know when and how it will be scanned: on a large poster or on a product packaging? The combination of these rows and columns creates a grid of modules. The maximum is 177 rows and 177 columns, which means the maximum possible number of modules is 31.

There are 40 preset sizes for you to choose from. They are called versions. Each version is then incremented by 4 rows and 4 columns. Here are some examples showing the difference in appearance for codes containing different amounts of data.

This includes positioning, timing, alignment, and format data, as well as error correction and version information. We're talking about bug fix mode later in the tech series, or you can jump in. It's a misconception that adjusting the surface area of ​​the code will allow you to add more data. Increasing the surface area of ​​your code will never allow you to have more than 177 columns and 177 rows, it just stretches the code to make modules bigger.

If you want to know more about one of these. Or Jump to: == Choose one ==. There is no technical limitation. One simply stretches more than the other, with the only difference being that the physical width and maximum of the module ends up being larger, but the number of modules that store data and their relative position remains the same.

When scanning from a distance, this large size is key. It would be impossible for them to get the whole image in the scanner. So the size of your code should be determined by the distance users have to scan it from, but technically there's really no limit to how big or small you can make it.

You most likely have a similar question if you are reading this. You may not want to hear this, but there is no right answer to this question. The good news is that you can figure out the ideal size for your campaign. If your phone scanner can detect every module, it will be able to read your code.

Testing and testing again

For a large billboard, the scanner would be hundreds of meters away. Once you have determined the expected crawl distance for your campaign, apply this standard rule. The scanning distance should be approximately 1 foot.

Scan Distance: 5 feet or 6 inches. High error correction will increase the number of rows and columns. This ensures that if the size of the image is increased, the resolution of the image will also increase as a result. If you follow the rules above, this is good practice, Golden Rule.

The black and white checkered pixel patterns appear at first glance like a small crossword puzzle and seem to have been put together at random. But if you look closely, some structures can be identified. A number of additional elements guarantee the correct reading of the information.

They indicate the direction in which the Code is printed. Using these strings, the scanner determines how large the data matrix is. Format templates contain error tolerance and data mask template information and make code easier to scan. These templates contain the actual data.

On the same subject

Because of this, up to 30% of the code structure can be destroyed without affecting the readability of the code. There you can select the type of code you want to generate and then enter the relevant details. Now you just decide which image format you want the code to be in and upload the file easily.

Questions about size

A large selection of them can be downloaded for free from various app stores. If the code is readable, it will be accessed by the automatically encoded address or action. The code consists of black modules arranged in a square pattern on a white background.

QR codes: introductory course

The processor finds three distinctive squares at the corners of the image and normalizes the image size, orientation, and viewing angle with a smaller square near the fourth corner. The small dots are then converted to binary numbers and verified with error-correcting code.

At the application level, there is some variation between most implementations. They used to be limited to industrial uses, which in recent years have expanded to consumer advertising and packaging as the proliferation of "smartphones" first introduced a barcode reader into every pocket. It may also be used to store personal information for government use. Many of these applications are designed for mobile phone users.

This act of linking to objects in the physical world is called a hyperlink or hyperlink object. The higher the error correction level, the smaller the memory capacity. The following table lists exemplary error correction capabilities at each of the four levels. Due to the design of Reed-Solomon codes and the use of 8-bit codewords, a single codeblock cannot contain more than 255 codewords. This means that no more than 15 errors per block can be corrected, which limits the complexity of certain steps in the decoding algorithm.

The format information records two things: the error correction level and the mask pattern used for the character. Masking is used to break up patterns in an area of ​​data that can confuse the scanner, such as large empty areas or misleading features that look like locator marks. The mask patterns are defined on a 6×6 grid that is repeated as needed to cover the entire character. Units corresponding to dark areas of the mask are inverted.

These messages are placed from right to left in a zigzag pattern, as shown below. In large symbols, this is complicated by the presence of alignment patterns and the use of multiple interleaved error correction blocks.

Four-digit indicators are used to select the encoding mode and transfer other information.

After each indicator that selects an encoding mode is a length field that tells how many characters are encoded in that mode. The number of bits in the length field depends on the character encoding and version, as shown below. Alphanumeric encoding mode stores the message more compactly than byte mode, but cannot store lower case and has a limited set of punctuation marks. Two characters are encoded into an 11-bit value using this formula.

Alphanumeric character codes look like this. My main goals are flexible options and absolute correctness. Additional advanced features. Regardless of the language used, the generated results are guaranteed to be identical because the algorithms are translated correctly.

This makes it easy to quickly build the right application. . Note that all private functions, methods, and fields are hidden as function-local variables, so it's impossible to access them from outside the library.


Has no dependencies in the box, only relying on the standard library. . Some of the commonly used official terms have non-intuitive meanings, as noted below.

Note that the module can be scaled to fit multiple pixels on the screen or in an image file. A way to measure the size of a character, from 1 to Note that all 40 versions are defined in the same standard, and this term is different from the usual meaning of word version.