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.

The data for which CRC will be calculated

Input Format *

Hexadecimal polynomial value

Initial CRC value

Value to XOR with final result

Reflect input data bits

Reflect final result bits

Results

CRC Value

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Hexadecimal

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Decimal

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Polynomial Used

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Frequently Asked Questions

What is CRC and why is it used?

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.

What's the difference between CRC-8, CRC-16, and CRC-32?

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.

What does the polynomial parameter control?

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.

What does 'reflected' mean in CRC calculation?

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.

How do I verify a CRC checksum?

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.

Can I use custom polynomial values?

Yes, you can enter custom polynomial values in hexadecimal format. Make sure to use the correct polynomial for your specific application or standard.