| BitArray | A simple, fast array of bits. |
| BitMatrix | Bit matrix. |
| BitUtils | General bit utilities. |
| CharacterSetEci | Encapsulates a Character Set ECI, according to "Extended Channel Interpretations" 5.3.1.1 of ISO 18004. |
| EcBlock | Encapsulates the parameters for one error-correction block in one symbol version. |
| EcBlocks | Encapsulates a set of error-correction blocks in one symbol version. |
| ErrorCorrectionLevel | Enum representing the four error correction levels. |
| FormatInformation | Encapsulates a QR Code's format information, including the data mask used and error correction level. |
| Mode | Enum representing various modes in which data can be encoded to bits. |
| ReedSolomonCodec | Reed-Solomon codec for 8-bit characters. |
| Version | Version representation. |