CRC Calculator
Calculate Cyclic Redundancy Check values for data integrity verification. Supports CRC-8, CRC-16, CRC-32, and CRC-64 with 15+ industry-standard variants. All computation runs in your browser — no data leaves your machine.
Input
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Result
Enter data to see CRC values
Common Use Cases
| Use Case | Recommended Variant | Notes |
|---|---|---|
| Ethernet / gzip / PNG | CRC-32/IEEE | The most common 32-bit CRC |
| Modbus RTU | CRC-16/MODBUS | Industrial automation standard |
| 1-Wire / DS18B20 | CRC-8/Dallas | Dallas/Maxim temperature sensors |
| ext4 / iSCSI / Btrfs | CRC-32C | Hardware-accelerated (SSE4.2 crc32c) |
| Firmware / bootloader | CRC-16/IBM or CRC-32/IEEE | Depends on your toolchain |
| HDLC / PPP | CRC-16/CCITT | Also XMODEM protocol |
| X.25 / V.42 | CRC-16/KERMIT | Reflected input and output |
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