⚡ Online CRC Calculator & CRC Lookup Table Generator

Modbus, CCITT, XMODEM 등 표준 CRC 계산, 룩업 테이블(CRC Table) 배열 추출, 소스 코드 및 역산 툴

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1. 입력 데이터 (Input Data / Binary File)

Text는 UTF-8 바이트로 변환됩니다.

2. 표준 알고리즘 결과 비교 (Standard CRC Compare)

행을 클릭하면 하단 파라미터 패널에 설정이 반영됩니다.

55 of 55 algorithms

Algorithm / CRC Table Standard	Width	Poly	Result (Hex)
CRC-8 / AUTOSAR	8-bit	0x2F	0xDF
CRC-8 / BLUETOOTH	8-bit	0xA7	0x26
CRC-8 / CDMA2000	8-bit	0x9B	0xDA
CRC-8 / DARC	8-bit	0x39	0x15
CRC-8 / DVB-S2	8-bit	0xD5	0xBC
CRC-8 / GSM-A	8-bit	0x1D	0x37
CRC-8 / GSM-B	8-bit	0x49	0x94
CRC-8 / HITAG	8-bit	0x1D	0xB4
CRC-8 / I-432-1	8-bit	0x07	0xA1
CRC-8 / I-CODE	8-bit	0x1D	0x7E
CRC-8 / LTE	8-bit	0x9B	0xEA
CRC-8 / MAXIM-DOW	8-bit	0x31	0xA1
CRC-8 / MIFARE-MAD	8-bit	0x1D	0x99
CRC-8 / OPENSAFETY	8-bit	0x2F	0x3E
CRC-8 / ROHC	8-bit	0x07	0xD0
CRC-8 / SAE-J1850	8-bit	0x1D	0x4B
CRC-8 / SMBUS	8-bit	0x07	0xF4
CRC-8 / TECH-3250	8-bit	0x1D	0x97
CRC-8 / WCDMA	8-bit	0x9B	0x25
CRC-16 / ARC	16-bit	0x8005	0xBB3D
CRC-16 / CDMA2000	16-bit	0xC867	0x4C06
CRC-16 / CMS	16-bit	0x8005	0xAEE7
CRC-16 / DDS-110	16-bit	0x8005	0x9ECF
CRC-16 / DECT-R	16-bit	0x0589	0x007E
CRC-16 / DECT-X	16-bit	0x0589	0x007F
CRC-16 / DNP	16-bit	0x3D65	0xEA82
CRC-16 / EN-13757	16-bit	0x3D65	0xC2B7
CRC-16 / GENIBUS	16-bit	0x1021	0xD64E
CRC-16 / GSM	16-bit	0x1021	0xCE3C
CRC-16 / IBM-3740	16-bit	0x1021	0x29B1
CRC-16 / IBM-SDLC	16-bit	0x1021	0x906E
CRC-16 / ISO-IEC-14443-3-A	16-bit	0x1021	0xBF05
CRC-16 / KERMIT	16-bit	0x1021	0x2189
CRC-16 / MAXIM-DOW	16-bit	0x8005	0x44C2
CRC-16 / MCRF4XX	16-bit	0x1021	0x6F91
CRC-16 / MODBUS	16-bit	0x8005	0x4B37
CRC-16 / OPENSAFETY-A	16-bit	0x5935	0x5D38
CRC-16 / OPENSAFETY-B	16-bit	0x755B	0x20FE
CRC-16 / PROFIBUS	16-bit	0x1DCF	0xA819
CRC-16 / T10-DIF	16-bit	0x8BB7	0xD0DB
CRC-16 / TELEDISK	16-bit	0xA097	0x0FB3
CRC-16 / UMTS	16-bit	0x8005	0xFEE8
CRC-16 / USB	16-bit	0x8005	0xB4C8
CRC-16 / XMODEM	16-bit	0x1021	0x31C3
CRC-32 / AIXM	32-bit	0x814141AB	0x3010BF7F
CRC-32 / AUTOSAR	32-bit	0xF4ACFB13	0x1697D06A
CRC-32 / BZIP2	32-bit	0x04C11DB7	0xFC891918
CRC-32 / CD-ROM-EDC	32-bit	0x8001801B	0x6EC2EDC4
CRC-32 / CKSUM	32-bit	0x04C11DB7	0x765E7680
CRC-32 / ISCSI	32-bit	0x1EDC6F41	0xE3069283
CRC-32 / ISO-HDLC	32-bit	0x04C11DB7	0xCBF43926
CRC-32 / JAMCRC	32-bit	0x04C11DB7	0x340BC6D9
CRC-32 / MEF	32-bit	0x741B8CD7	0xD2C22F51
CRC-32 / MPEG-2	32-bit	0x04C11DB7	0x0376E6E7
CRC-32 / XFER	32-bit	0x000000AF	0xBD0BE338

3. 파라미터 상세 분석 및 커스텀 조작

비트 폭 (Width)

폴리넘얼 (Hex)

초기값 (Init)

최종 XOR (XOR Out)

Reflect InReflect Out

CRC-16 / MODBUS 결과 (Result)0x4B37

5. CRC 역산 (Force CRC / Patch Finder)

원하는 최종 CRC 값이 나오도록 데이터 뒤에 채워야 할 패치 바이트(2바이트)를 역산합니다.

계산 대기 중...

4. 순수 룩업 테이블 전용 (CRC Lookup Table Generator)

완벽하게 정렬된 순수 CRC 8/16/32 테이블 배열 텍스트입니다.

복사 완료!

  0x0000, 0xC0C1, 0xC181, 0x0140, 0xC301, 0x03C0, 0x0280, 0xC241, 
  0xC601, 0x06C0, 0x0780, 0xC741, 0x0500, 0xC5C1, 0xC481, 0x0440, 
  0xCC01, 0x0CC0, 0x0D80, 0xCD41, 0x0F00, 0xCFC1, 0xCE81, 0x0E40, 
  0x0A00, 0xCAC1, 0xCB81, 0x0B40, 0xC901, 0x09C0, 0x0880, 0xC841, 
  0xD801, 0x18C0, 0x1980, 0xD941, 0x1B00, 0xDBC1, 0xDA81, 0x1A40, 
  0x1E00, 0xDEC1, 0xDF81, 0x1F40, 0xDD01, 0x1DC0, 0x1C80, 0xDC41, 
  0x1400, 0xD4C1, 0xD581, 0x1540, 0xD701, 0x17C0, 0x1680, 0xD641, 
  0xD201, 0x12C0, 0x1380, 0xD341, 0x1100, 0xD1C1, 0xD081, 0x1040, 
  0xF001, 0x30C0, 0x3180, 0xF141, 0x3300, 0xF3C1, 0xF281, 0x3240, 
  0x3600, 0xF6C1, 0xF781, 0x3740, 0xF501, 0x35C0, 0x3480, 0xF441, 
  0x3C00, 0xFCC1, 0xFD81, 0x3D40, 0xFF01, 0x3FC0, 0x3E80, 0xFE41, 
  0xFA01, 0x3AC0, 0x3B80, 0xFB41, 0x3900, 0xF9C1, 0xF881, 0x3840, 
  0x2800, 0xE8C1, 0xE981, 0x2940, 0xEB01, 0x2BC0, 0x2A80, 0xEA41, 
  0xEE01, 0x2EC0, 0x2F80, 0xEF41, 0x2D00, 0xEDC1, 0xEC81, 0x2C40, 
  0xE401, 0x24C0, 0x2580, 0xE541, 0x2700, 0xE7C1, 0xE681, 0x2640, 
  0x2200, 0xE2C1, 0xE381, 0x2340, 0xE101, 0x21C0, 0x2080, 0xE041, 
  0xA001, 0x60C0, 0x6180, 0xA141, 0x6300, 0xA3C1, 0xA281, 0x6240, 
  0x6600, 0xA6C1, 0xA781, 0x6740, 0xA501, 0x65C0, 0x6480, 0xA441, 
  0x6C00, 0xACC1, 0xAD81, 0x6D40, 0xAF01, 0x6FC0, 0x6E80, 0xAE41, 
  0xAA01, 0x6AC0, 0x6B80, 0xAB41, 0x6900, 0xA9C1, 0xA881, 0x6840, 
  0x7800, 0xB8C1, 0xB981, 0x7940, 0xBB01, 0x7BC0, 0x7A80, 0xBA41, 
  0xBE01, 0x7EC0, 0x7F80, 0xBF41, 0x7D00, 0xBDC1, 0xBC81, 0x7C40, 
  0xB401, 0x74C0, 0x7580, 0xB541, 0x7700, 0xB7C1, 0xB681, 0x7640, 
  0x7200, 0xB2C1, 0xB381, 0x7340, 0xB101, 0x71C0, 0x7080, 0xB041, 
  0x5000, 0x90C1, 0x9181, 0x5140, 0x9301, 0x53C0, 0x5280, 0x9241, 
  0x9601, 0x56C0, 0x5780, 0x9741, 0x5500, 0x95C1, 0x9481, 0x5440, 
  0x9C01, 0x5CC0, 0x5D80, 0x9D41, 0x5F00, 0x9FC1, 0x9E81, 0x5E40, 
  0x5A00, 0x9AC1, 0x9B81, 0x5B40, 0x9901, 0x59C0, 0x5880, 0x9841, 
  0x8801, 0x48C0, 0x4980, 0x8941, 0x4B00, 0x8BC1, 0x8A81, 0x4A40, 
  0x4E00, 0x8EC1, 0x8F81, 0x4F40, 0x8D01, 0x4DC0, 0x4C80, 0x8C41, 
  0x4400, 0x84C1, 0x8581, 0x4540, 0x8701, 0x47C0, 0x4680, 0x8641, 
  0x8201, 0x42C0, 0x4380, 0x8341, 0x4100, 0x81C1, 0x8081, 0x4040

Model: CRC-16 / MODBUSCRC Table & Lookup Array

6. 언어별 전체 함수 소스 코드 및 CRC Table (C Source)

CRC-16 / MODBUS

복사 완료!

/* 
 * Model: CRC-16 / MODBUS (16-bit)
 * Poly: 0x8005, Init: 0xFFFF, XorOut: 0x0000
 * CRC Table C Source Code & Lookup Table Generator
 */
#include <stdint.h>
#include <stddef.h>

const uint16_t crc_table[256] = {
  0x0000, 0xC0C1, 0xC181, 0x0140, 0xC301, 0x03C0, 0x0280, 0xC241, 
  0xC601, 0x06C0, 0x0780, 0xC741, 0x0500, 0xC5C1, 0xC481, 0x0440, 
  0xCC01, 0x0CC0, 0x0D80, 0xCD41, 0x0F00, 0xCFC1, 0xCE81, 0x0E40, 
  0x0A00, 0xCAC1, 0xCB81, 0x0B40, 0xC901, 0x09C0, 0x0880, 0xC841, 
  0xD801, 0x18C0, 0x1980, 0xD941, 0x1B00, 0xDBC1, 0xDA81, 0x1A40, 
  0x1E00, 0xDEC1, 0xDF81, 0x1F40, 0xDD01, 0x1DC0, 0x1C80, 0xDC41, 
  0x1400, 0xD4C1, 0xD581, 0x1540, 0xD701, 0x17C0, 0x1680, 0xD641, 
  0xD201, 0x12C0, 0x1380, 0xD341, 0x1100, 0xD1C1, 0xD081, 0x1040, 
  0xF001, 0x30C0, 0x3180, 0xF141, 0x3300, 0xF3C1, 0xF281, 0x3240, 
  0x3600, 0xF6C1, 0xF781, 0x3740, 0xF501, 0x35C0, 0x3480, 0xF441, 
  0x3C00, 0xFCC1, 0xFD81, 0x3D40, 0xFF01, 0x3FC0, 0x3E80, 0xFE41, 
  0xFA01, 0x3AC0, 0x3B80, 0xFB41, 0x3900, 0xF9C1, 0xF881, 0x3840, 
  0x2800, 0xE8C1, 0xE981, 0x2940, 0xEB01, 0x2BC0, 0x2A80, 0xEA41, 
  0xEE01, 0x2EC0, 0x2F80, 0xEF41, 0x2D00, 0xEDC1, 0xEC81, 0x2C40, 
  0xE401, 0x24C0, 0x2580, 0xE541, 0x2700, 0xE7C1, 0xE681, 0x2640, 
  0x2200, 0xE2C1, 0xE381, 0x2340, 0xE101, 0x21C0, 0x2080, 0xE041, 
  0xA001, 0x60C0, 0x6180, 0xA141, 0x6300, 0xA3C1, 0xA281, 0x6240, 
  0x6600, 0xA6C1, 0xA781, 0x6740, 0xA501, 0x65C0, 0x6480, 0xA441, 
  0x6C00, 0xACC1, 0xAD81, 0x6D40, 0xAF01, 0x6FC0, 0x6E80, 0xAE41, 
  0xAA01, 0x6AC0, 0x6B80, 0xAB41, 0x6900, 0xA9C1, 0xA881, 0x6840, 
  0x7800, 0xB8C1, 0xB981, 0x7940, 0xBB01, 0x7BC0, 0x7A80, 0xBA41, 
  0xBE01, 0x7EC0, 0x7F80, 0xBF41, 0x7D00, 0xBDC1, 0xBC81, 0x7C40, 
  0xB401, 0x74C0, 0x7580, 0xB541, 0x7700, 0xB7C1, 0xB681, 0x7640, 
  0x7200, 0xB2C1, 0xB381, 0x7340, 0xB101, 0x71C0, 0x7080, 0xB041, 
  0x5000, 0x90C1, 0x9181, 0x5140, 0x9301, 0x53C0, 0x5280, 0x9241, 
  0x9601, 0x56C0, 0x5780, 0x9741, 0x5500, 0x95C1, 0x9481, 0x5440, 
  0x9C01, 0x5CC0, 0x5D80, 0x9D41, 0x5F00, 0x9FC1, 0x9E81, 0x5E40, 
  0x5A00, 0x9AC1, 0x9B81, 0x5B40, 0x9901, 0x59C0, 0x5880, 0x9841, 
  0x8801, 0x48C0, 0x4980, 0x8941, 0x4B00, 0x8BC1, 0x8A81, 0x4A40, 
  0x4E00, 0x8EC1, 0x8F81, 0x4F40, 0x8D01, 0x4DC0, 0x4C80, 0x8C41, 
  0x4400, 0x84C1, 0x8581, 0x4540, 0x8701, 0x47C0, 0x4680, 0x8641, 
  0x8201, 0x42C0, 0x4380, 0x8341, 0x4100, 0x81C1, 0x8081, 0x4040
};

uint16_t calculate_crc(const uint8_t *data, size_t length) {
    uint16_t crc = 0xFFFF;
    for (size_t i = 0; i < length; i++) {
        #if 1
        uint8_t idx = (uint8_t)(crc ^ data[i]);
        crc = (crc >> 8) ^ crc_table[idx];
        #else
        uint8_t idx = (uint8_t)((crc >> 8) ^ data[i]);
        crc = (crc << 8) ^ crc_table[idx];
        #endif
    }
    return crc ^ 0x0000;
}

Online CRC Calculator and CRC Lookup Table Generator

This free online CRC calculator computes CRC-8, CRC-16, and CRC-32 checksums from UTF-8 text, hexadecimal, decimal-byte, binary-bit, Base64 input, or binary files. You can select common preset algorithms such as CRC-16/MODBUS, CRC-16/CCITT-FALSE, CRC-16/XMODEM, CRC-16/KERMIT, and CRC-32/ISO-HDLC, or define custom CRC parameters for your own protocol.

The calculator also generates CRC lookup tables and complete source code for C, Python, and JavaScript. All calculations are performed locally in your browser, so uploaded files and input data are not sent to a server.

Supported CRC parameters

Custom CRC calculations can be configured using width, polynomial, initial value, input reflection, output reflection, and final XOR value. These parameters allow the calculator to reproduce many standard and proprietary CRC implementations used in embedded systems, serial communication, industrial protocols, file formats, and network applications.

Width: Defines the CRC register size, such as 8, 16, or 32 bits.
Polynomial: Specifies the generator polynomial used by the CRC algorithm.
Initial value: Sets the value loaded into the CRC register before processing data.
RefIn and RefOut: Control whether input bytes and the final CRC result are reflected.
Final XOR value: Applies a final XOR operation to the CRC register before displaying the checksum.

CRC-8, CRC-16, and CRC-32

CRC-8 produces an 8-bit checksum and is commonly used in compact embedded and sensor protocols. CRC-16 produces a 16-bit checksum and is widely used by protocols such as Modbus, XMODEM, and CCITT-based communication systems. CRC-32 produces a 32-bit checksum and provides stronger error detection for larger files, archives, Ethernet frames, and storage formats.

CRC lookup table and source code generator

A CRC lookup table replaces repeated bit-by-bit polynomial operations with precomputed values. This can significantly improve checksum performance in firmware, embedded software, and high-throughput applications. The generated table and function code can be copied directly into C, Python, or JavaScript projects and adapted as needed.

Frequently asked questions

What is a CRC checksum?

A cyclic redundancy check, or CRC, is an error-detection method used to identify accidental changes in transmitted or stored data. The sender calculates a CRC value, and the receiver calculates it again to verify that the data has not been corrupted.

Which CRC algorithm should I use?

Use the algorithm required by your protocol or file format. For example, Modbus commonly uses CRC-16/MODBUS, while other systems may require CCITT-FALSE, XMODEM, KERMIT, CRC-32, or a custom parameter set.

Why do CRC calculators sometimes return different results?

CRC results depend on more than the polynomial. Width, initial value, input reflection, output reflection, final XOR value, input encoding, and byte order must all match. A difference in any one of these settings can produce a different checksum.

Can I calculate the CRC of a binary file?

Yes. Select the file input option and choose a binary file. The calculator reads the file as bytes and computes the selected CRC directly in your browser.

Are uploaded files sent to a server?

No. CRC calculations and file processing are performed locally in the browser. Your files and input data are not uploaded to the website server.

What is the standard CRC check value for 123456789?

The ASCII string 123456789 is commonly used as a standard CRC test input. The expected result depends on the selected algorithm. For example, CRC-32/ISO-HDLC produces 0xCBF43926, while CRC-16/MODBUS produces 0x4B37.