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CRC16 Calculator

Free online CRC16 checksum calculator.

What Is a CRC16 Calculator?

The CRC16 Calculator computes a CRC-16 checksum (CCITT variant) for a string, producing a 4-character hexadecimal value. CRC-16 is widely used for error checking in embedded systems, communication protocols, and low-bandwidth links where a short checksum is sufficient.

How to Use This CRC16 Calculator

  1. 1
    Input TextType or paste the data you want to checksum into the input field.
  2. 2
    Instant CalculationThe 4-character CRC-16 value is computed as you type.
  3. 3
    Copy ResultClick the copy button to save the checksum.

Frequently Asked Questions

This tool implements CRC-16 with the CCITT-FALSE parameters (polynomial 0x1021, init 0xFFFF, no reflection, no final XOR), one of the most common variants.
CRC-16 is used in protocols like Modbus, X.25, HDLC, and many sensor and IoT communication protocols for basic error detection.

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