Checksum Calculator
Paste hexadecimal bytes to calculate Sum-8, LRC, XOR and CRC16 checksums instantly in your browser.
Hit Calculate to validate and map bytes
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Your explanation appears here
Simple checksums catch many transmission mistakes, but they are not cryptographic hashes and should not be used for security authentication.
Your plan appears after calculation
Append a test byte and see how the selected checksum changes without editing your main input.
Calculate baseline first
Sum-8 adds all parsed bytes and keeps the lowest 8 bits. LRC-8 is the two's complement of that Sum-8. XOR-8 XORs every byte. CRC16-CCITT uses polynomial 0x1021 with initial value 0xFFFF.
You can enter byte pairs separated by spaces, commas, dashes, colons or line breaks. Prefixes like 0x are ignored. After separators are removed, the calculator expects an even number of hexadecimal characters.
No. Checksums are useful for quick integrity checks and detecting accidental changes, but they are not designed to prevent tampering. Use cryptographic hashes or message authentication codes for security-sensitive workflows.
Results are calculated locally in your browser from the hex text you enter. Verify the required checksum variant, byte order and seed values for your protocol before using the output in firmware, payment, medical, automotive or safety-critical systems. VisionVix accepts no liability for decisions based on this output.
