CRC widthBit length:CRC-8CRC-16CRC-32CRC-64CRC parametrizationPredefinedCustom
8-bit Checksum Calculator. Case Converter Epoch Converter CheckSum Decimal to Hexadecimal Binary to Hexadecimal Decimal to Binary Decimal-Binary-Hex Length.
CRC detailed parametersInput reflected: Result reflected:Polynomial:
Initial Value:
Final Xor Value: CRC Input DataStringBytesBinary string
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)
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:
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Crc 16 Algorithm
- 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 Understanding and implementing CRC (Cyclic Redundancy Check) calculation 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. E.g. 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.
- If the input data is defined as 'binary string', then the byte values shall be given as eight-digit binary strings, separated by a white space. So '00110001 00110010' is the same as bytes 0x31 0x32. If a single string has less than eight digits, zeros are padded as prefix, so 100 is actually interpreted as 00000100. If a single string has more than eight digits, only the first eight digits are used.
History
2019/02/12: Added the support for 64bit CRC calculation and for binary string input.
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. of 0x0001. Please note the added description above about input data. Thanks to Matthew Reed for pointing the issue to me.2016/07/09: Fixed a bug: When the input data was given as bytes, then the number of whitespaces had an influence on the result. E.g the CRC value of '0x31 0x32' and '0x31 0x32' (note the additional space character) were not the same. The fix now shall ignore all number and kinds of whitespace characters and take only the byte values into account. Thanks to Alan Ott Goodman for pointing the issue to me.
2016/03/09: Fixed a bug: Sometimes a CRC32 result value was printed with only seven digits! A zero was then missing, e.g. the printed result was 0xC6FF2F8 instead of the correct one 0xC6FF02F8. Thanks to David Goodman for pointing the issue to me.
2015/05/30: Initial release.
Create your hashes online
With this online converter you can upload a file and calculate the CRC-32 checksum to verify your data. You can also enter data manually and convert it to a CRC-32 hash. By using the HMAC field you can increase the security of your data with a shared key.
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Crc 16 Calculator Online
The CRC-32 cipher is a non-secure hashing method basically to detect accidental changes of data. More information can be found here: A Painless Guide to CRC Error Detection Algorithms. It's basically used on ethernet, compared to the CRC32B online calculator
The input string encoding is expected to be in UTF-8. Different encoding will result in different hash values. Unicode is considered best practices.