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CRC32 Calculator

Calculate the CRC-32/ISO-HDLC checksum of UTF-8 text.

Convert in your browser · No sign-up

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.

Result

Add your input or load an example, then run the tool. Your result will appear here.

How to use

  1. Calculate the CRC-32/ISO-HDLC checksum of UTF-8 text.
  2. Choose the mode or options, then run the tool.
  3. Review the result, then copy or download the TXT file.

Example

123456789 → cbf43926

Details and limitations

Text stays in your browser; it is not sent to a conversion server.

Format references

Tool page updated: