Calculate the CRC-32/ISO-HDLC checksum of UTF-8 text.
Type or paste on the left — the result updates as you type.
Uses reflected polynomial 0xEDB88320, initial and final XOR 0xFFFFFFFF. CRC detects errors; it is not a cryptographic hash.
Up to 100,000 UTF-16 units per input and 1,000,000 per result. See the supported formats and examples below.
Tool page updated: 2026-09-27
