BASE64DECODE

=BASE64DECODE(stringToDecode)

stringToDecode
required. The string that will be decoded from Base64

Decodes Base64 encoded string

felixstraube

Active Member
Joined
Nov 27, 2023
Messages
492
Office Version
  1. 365
Platform
  1. Windows
  2. Web
BASE64DECODE function Decodes Base64 encoded string.

Excel Formula:
=LAMBDA(x,
    LET(base64codes, {"A";"B";"C";"D";"E";"F";"G";"H";"I";"J";"K";"L";"M";"N";"O";"P";"Q";"R";"S";"T";"U";"V";"W";"X";"Y";"Z";"a";"b";"c";"d";"e";"f";"g";"h";"i";"j";"k";"l";"m";"n";"o";"p";"q";"r";"s";"t";"u";"v";"w";"x";"y";"z";"0";"1";"2";"3";"4";"5";"6";"7";"8";"9";"+";"/"},
        inputStr, x,
        chars, MID(inputStr, SEQUENCE(,LEN(inputStr)),1),
        t, CONCAT(DEC2BIN(BYCOL(chars, LAMBDA(x, MATCH(TRUE, EXACT(x, base64codes),0)-1)), 6)),
        b, MID(t, SEQUENCE(,LEN(t)),1),
        r, WRAPROWS(b, 8, 0), 
        charDec, BYROW(r, LAMBDA(x, BIN2DEC(CONCAT(x)))),
        CONCAT(IFERROR(CHAR(charDec),""))
    )
)

Base64EncodeDecode.xlsx
AB
1Input StringLAMBDA Eecode
2U3VuSun
3T2ZmaWNlIENvbW11bmljYXRpb25zIFNlcnZlciAyMDA3Office Communications Server 2007
Sheet1
Cell Formulas
RangeFormula
B2:B3B2=BASE64DECODE(A2)
Lambda Functions
NameFormula
BASE64DECODE=LAMBDA(x, LET( base64codes, {"A";"B";"C";"D";"E";"F";"G";"H";"I";"J";"K";"L";"M";"N";"O";"P";"Q";"R";"S";"T";"U";"V";"W";"X";"Y";"Z";"a";"b";"c";"d";"e";"f";"g";"h";"i";"j";"k";"l";"m";"n";"o";"p";"q";"r";"s";"t";"u";"v";"w";"x";"y";"z";"0";"1";"2";"3";"4";"5";"6";"7";"8";"9";"+";"/"}, inputStr, x, chars, MID(inputStr, SEQUENCE(,LEN(inputStr)),1), t, CONCAT(DEC2BIN(BYCOL(chars, LAMBDA(x, MATCH(TRUE, EXACT(x, base64codes),0)-1)), 6)), b, MID(t, SEQUENCE(,LEN(t)),1), r, WRAPROWS(b, 8, 0), charDec, BYROW(r, LAMBDA(x, BIN2DEC(CONCAT(x)))), CONCAT(IFERROR(CHAR(charDec),"")) ))
 
Upvote 0
The corrected function as @Xlambda suggested. Thanks again for taking the time to test the functions.

Excel Formula:
=LAMBDA(a, MAP(a,
LAMBDA(input, LET(
base64codes, {"A";"B";"C";"D";"E";"F";"G";"H";"I";"J";"K";"L";"M";"N";"O";"P";"Q";"R";"S";"T";"U";"V";"W";"X";"Y";"Z";"a";"b";"c";"d";"e";"f";"g";"h";"i";"j";"k";"l";"m";"n";"o";"p";"q";"r";"s";"t";"u";"v";"w";"x";"y";"z";"0";"1";"2";"3";"4";"5";"6";"7";"8";"9";"+";"/"},
inputStr, SUBSTITUTE(input, "=", ""),
chars, MID(inputStr, SEQUENCE(, LEN(inputStr)), 1),
t, CONCAT(DEC2BIN(BYCOL(chars, LAMBDA(x, MATCH(TRUE, EXACT(x, base64codes), 0) - 1)), 6)),
b, MID(t, SEQUENCE(, LEN(t)), 1),
r, WRAPROWS(b, 8, 0),
charDec, BYROW(r, LAMBDA(x, BIN2DEC(CONCAT(x)))),
CONCAT(IFERROR(CHAR(charDec), ""))
))
))

Can a Moderator please edit the OP and correct the formula and add that the argument now can take a range of cells? Thanks
 
Here is the las correction. Now it decodes concatenated encoded strings correctly.

Excel Formula:
=LAMBDA(a, MAP(a,
LAMBDA(input, LET(
base64codes, {"A";"B";"C";"D";"E";"F";"G";"H";"I";"J";"K";"L";"M";"N";"O";"P";"Q";"R";"S";"T";"U";"V";"W";"X";"Y";"Z";"a";"b";"c";"d";"e";"f";"g";"h";"i";"j";"k";"l";"m";"n";"o";"p";"q";"r";"s";"t";"u";"v";"w";"x";"y";"z";"0";"1";"2";"3";"4";"5";"6";"7";"8";"9";"+";"/"},
inputStr, SUBSTITUTE(input, "=", "A"),
chars, MID(inputStr, SEQUENCE(, LEN(inputStr)), 1),
t, CONCAT(DEC2BIN(BYCOL(chars, LAMBDA(x, MATCH(TRUE, EXACT(x, base64codes), 0) - 1)), 6)),
b, MID(t, SEQUENCE(, LEN(t)), 1),
r, WRAPROWS(b, 8, 0),
charDec, BYROW(r, LAMBDA(x, BIN2DEC(CONCAT(x)))),
CONCAT(IFERROR(CHAR(charDec), ""))
))
))
 

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