CRC-16 Checksum Calculator

Compute 16-bit Cyclic Redundancy Check (CRC-16) codes across ARC, IBM-3740, Modbus, and XModem standards.

How It Works & Processing Standards

Compute 16-bit Cyclic Redundancy Check (CRC-16) codes across ARC, IBM-3740, Modbus, and XModem standards.

Your input data is never sent to any server and is securely processed on your device.

Current Limits

  • Maximum input length: 2,000,000 characters

CRC-16 Checksum Calculator is a 100% free, browser-based online utility. All calculations and file conversions run locally inside your browser (Local-First) without sending data to remote servers, keeping your documents and inputs strictly private.

How to Use CRC-16 Checksum Calculator

  1. 1
    Enter TextProvide the data payload in the input field.
  2. 2
    Select StandardChoose CRC-16/ARC, CRC-16/IBM-3740, CRC-16/MODBUS, or CRC-16/XMODEM.
  3. 3
    Copy CRC-16Copy the resulting 4-hex-digit checksum.

Common Use Cases

  • Modbus RTU packet verification, serial comms auditing, and legacy file transfer protocols
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