CRC32 vs CRC32C

CRC32 (IEEE) and CRC32C (Castagnoli) are different polynomials with different error-detection properties. CRC32C often benefits from CPU acceleration (SSE4.2 or dedicated instructions), making it attractive for high-throughput systems such as storage and networking stacks.

Interoperability is key: choose the variant that your ecosystem uses and keep it consistent across producers and consumers. Validate with our calculators: CRC32 and CRC32C.

Related tools

Try: CRC32, CRC32C, This guide

FAQ

Which variant is faster?

On many CPUs, CRC32C can use SSE4.2 instructions, making it significantly faster than CRC32 when available.

Are CRC32 and CRC32C interchangeable?

No. They use different polynomials and yield different results for the same data. Systems must agree on the variant.