About

A Quick Response (QR) code is a two-dimensional barcode capable of storing significantly more data than standard barcodes. This tool converts your input data whether it is a website URL, plain text, or contact information into a machine-readable matrix image. These codes are essential for bridging the physical and digital worlds, allowing users to access information instantly via smartphone cameras without typing long addresses.

Formulas

The generation process follows a specific algorithmic structure to ensure data integrity and readability:

Step 1. Data Analysis: Determine the optimal encoding mode (Numeric, Alphanumeric, Byte, or Kanji).
Step 2. Error Correction Coding: Reed-Solomon error correction is applied to allow readability even if the image is partially damaged.
Step 3. Masking: A mask pattern is applied to break up patterns that might confuse the scanner.
Step 4. Formatting: Format and version information is added to the matrix.

Reference Data

Version (Size)	Modules	Numeric Capacity	Alphanumeric Capacity
Version 1	21x21	41	25
Version 10	57x57	652	395
Version 25	117x117	3,057	1,852
Version 40	177x177	7,089	4,296

Frequently Asked Questions

Static QR codes encode the data directly into the pattern; once generated, they cannot be changed. Dynamic QR codes encode a redirect URL, allowing you to change the destination content without reprinting the code.

Level L (Low) restores 7% of data, suitable for clean environments. Level H (High) restores up to 30%, making it ideal if the QR code will be placed outdoors or might get dirty/damaged.

Common issues include low contrast (ensure the code is darker than the background), insufficient quiet zone (white space around the border), or the code being too complex (too much data) for the print size.