CRC Calculator. A CRC (Cyclic Redundancy Check) is a checksum value used to detect errors in data transmission and storage — this calculator computes it for any text or binary input. Paste your data into the Input Data field, choose ASCII or Hexadecimal input format, then select your CRC Type (CRC-8, CRC-16, or CRC-32) and configure the polynomial, initial value, and final XOR to get your CRC Value in hex, decimal, octal, or binary. Also try the Karnaugh Map (K-Map) Calculator.
CRC (Cyclic Redundancy Check) is an error-detecting code used to detect accidental changes to digital data. It's commonly used in data transmission, storage systems, and file integrity verification. See also our use the Nyquist Frequency Calculator.
The numbers refer to the bit length of the CRC value. CRC-8 produces 8-bit checksums, CRC-16 produces 16-bit checksums, and CRC-32 produces 32-bit checksums. Longer CRCs provide better error detection capabilities.
The polynomial defines the mathematical basis for CRC calculation. Different standards use different polynomials. Common ones include 0x04C11DB7 for CRC-32 and 0x1021 for CRC-16 CCITT.
Reflection means processing bits in reverse order (LSB first instead of MSB first). Some CRC implementations reflect input data, output results, or both depending on the standard.
Calculate the CRC of your data using the same parameters (polynomial, initial value, etc.) and compare it with the expected checksum. If they match, the data integrity is verified.
Yes, you can enter custom polynomial values in hexadecimal format. Make sure to use the correct polynomial for your specific application or standard.