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🔗 LRC Checksum Calculator

Compute ISO 1155 LRC (Longitudinal Redundancy Check) with text/hex/Base64 input, step-by-step trace, verification and batch mode for Modbus ASCII and serial protocol debugging

🔒 All computation runs locally in your browser. Input data is not uploaded by the tool.

Input mode

HEX accepts "48 65", "0x48,0x65", "\x48", newlines and # / // line comments

0 bytes recognized

Leave empty to use all bytes. Indices are 0-based.

Output Format

Results (click to copy)

LRC (ISO 1155)
—
Raw Sum8 (intermediate)
—
🔍 Step-by-step trace (LRC)
# Byte Sum (before) Sum (after)

After you enter valid bytes, each accumulation step will appear here.

✓ Verify against expected (optional)
📋 Batch mode (one group per line)

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Online LRC (Longitudinal Redundancy Check) calculator based on ISO 1155 (two's complement method), with text, hex and Base64 input. Displays both the LRC checksum and the raw Sum8 intermediate value, with step-by-step trace, verification and batch mode. Configure byte range and output format (hex, HEX, DEC, BIN, CHAR with optional 0x prefix). All computation runs locally in your browser, ideal for Modbus ASCII, serial protocol debugging and industrial communication checksum verification.