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Asked: 2026-05-21T15:36:56+00:00

Currently I search a function in MySQL to do conversion between hex string to

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Currently I search a function in MySQL to do conversion between hex string to binary representation, example:

0000 -> 0000000000000000
00AA -> 0000000010101010
FFFF -> 1111111111111111

I have already tried

UNHEX('00AA')
CAST('00AA' AS BINARY)
CONVERT('00AA', BINARY)

but didn’t get the results I want.

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1 Answer

  1. Editorial Team

    Use CONV() function:

    CONV(string, 16, 2)

    To have length according to input:

    LPAD(CONV(string, 16, 2), LENGTH(string)*4, '0')

    As CONV() works with 64-bit precision, you can’t have more than 64 bits converted, so you can use this as well:

    LPAD(CONV(string, 16, 2), 64, '0')

    and you should check that LENGTH(string) <= 16 or you may get erroneous results.

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