Checksum · CRC Toolkit
CRC Checksum Generator
Generate CRC-8, CRC-16, CRC-32, and CRC-64 digests for any text input. Results update instantly in your browser—no uploads, no server dependencies. Need to check files instead? Use the CRC file tool →
Current length: 0 characters
Output format
Enter text above and click “Calculate checksums” to see CRC-8/16/32/64 digests side by side.
CRC overview
CRC-32 is the classic checksum used in ZIP archives, Ethernet frames, and countless embedded systems. CRC-32C (Castagnoli) offers better error detection and powers modern storage protocols. Both are available here with a single click.
Common polynomial lengths:
- 9 bits (CRC-8)
- 17 bits (CRC-16)
- 33 bits (CRC-32)
- 65 bits (CRC-64)
Every calculation runs locally in your browser—the data never leaves this tab.