CRC16 is a 16-bit Cyclic Redundancy Check used to detect errors in data transmission. It's common in serial communication protocols like MODBUS, USB, HDLC, and X.25.

Common variants include CRC-16-CCITT (X.25, HDLC), CRC-16-IBM (USB, MODBUS), CRC-16-XMODEM, and CRC-16-DNP. Each uses different polynomials and initial values.

MODBUS RTU uses CRC-16-IBM (also called CRC-16-ANSI) with polynomial 0x8005, initial value 0xFFFF, and reflected input/output.

No. CRC16 is designed for error detection in data transmission, not security. It's easy to create collisions. Use SHA-256 for security purposes.

CRC16 produces a 16-bit (2-byte) value, typically shown as 4 hexadecimal characters like 'A5B7'.

CRC32 uses a 32-bit checksum providing better error detection. CRC16 is smaller and faster, suitable for embedded systems and protocols with size constraints.

CRC16 has many variants with different polynomials, initial values, and reflection settings. Ensure you're using the same variant for comparison.

Yes. All computation happens in your browser using JavaScript. Your data never leaves your device.

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