CRC Calculator is an online tool to compute the CRC-16 & CRC-32 checksum of a string or file locally on your browser. This hash can be used to verify the integrity of the data during transmission. You can provide the expected hash and compare the calculated CRC checksum with it. The CRC hash can be generated in Base64, Hex or Integer formats. The input can be provided in Plain Text, Base64 or as a binary file which you can select from your machine. Create a CRC-32 checksum of an uploaded file with this free online hash calculator. On-line CRC calculation. Free CRC routines downloadable. Javascript sourced, No limits, Covers CRC-16, 32, CCITT, DNP and Sick routines. Free CRC routines downloadable. Covers CRC-16, 32. The CRC calculation or cyclic redundancy check was the result of. You can use the calculator above to check. ![]() Hit the Calculate button to generate and check the CRC value. CRC Calculator (Javascript) CRC width RadioButton: CRC-8 CRC-16 CRC-32 CRC parametrization Predefined Custom CRC detailed parameters Input reflected: Result reflected: Polynomial: Initial Value: Final Xor Value: CRC Input Data String Bytes 0x31 0x32 0x33 0x34 0x35 0x36 0x37 0x38 0x39 Show reflected lookup table: (This option does not affect the CRC calculation, only the displayed lookup table) Calculate CRC! Result CRC value: - Lookup Table: - Description This javascript featured website calculates the CRC value from an input string or an input byte string. Several common CRC instance predefined and available from a list. Furthermore, the definition of own CRC instances is supported by specifying: • Width of CRC (8, 16 or 32 bit) • Polynomial • Initial CRC value • Final XOR value • Input reflected • Result reflected Also the generation of CRC lookup tables is supported. Please refer to my article for an detailed discussion of CRC calculation. Here some notes about the input data: • If the input data is defined as 'string', then each character (including whitespaces) is converted to its (byte) value and this byte stream is the input for the calculation. The string '12' is converted to its ASCII respresentation [0x31, 0x32]. This means that the CRC of input string '12' and byte input 0x31 0x32 is the same. • If the input data is defined as 'bytes', then the byte values shall be given in hexadecimal notation beginning with a '0x' and separated by a white space, e.g '0x31 0x32'. If no whitespace is detected, the '0x' prefix must be omitted and always two digits are taken for a character. So instead of '0x31 0x32', it's also possible to specify '3132'. Note that this means that '01' and '0001' are then NOT the same. History 2016/11/11: Added the option to print the CRC lookup table 'reversed'. 2016/07/27: Fixed a bug: A hexadecimal value with more than two digits after the '0x' is not correctly parsed. This could have resulted in the fact that the calculated CRC value of 0x01 differs to e.g.
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