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Base64 Decoder - Base64 Encoder

Decode Base64 to Text or Encode Text to Base64

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Base64 Decoder (base 64 to Ascii text) Table

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Index

Character

6 digit binary

Decimal

0

A

000000

65

1

B

000001

66

2

C

000010

67

3

D

000011

68

4

E

000100

69

5

F

000101

70

6

G

000110

71

7

H

000111

72

8

I

001000

73

9

J

001001

74

10

K

001010

75

11

L

001011

76

12

M

001100

77

13

N

001101

78

14

O

001110

79

15

P

001111

80

16

Q

010000

81

17

R

010001

82

18

S

010010

83

19

T

010011

84

20

U

010100

85

21

V

010101

86

22

W

010110

87

23

X

010111

88

24

Y

011000

89

25

Z

011001

90

26

a

011010

97

27

b

011011

98

28

c

011100

99

29

d

011101

100

30

e

011110

101

31

f

011111

102

32

g

100000

103

33

h

100001

104

34

i

100010

105

35

j

100011

106

36

k

100100

107

37

l

100101

108

38

m

100110

109

39

n

100111

110

40

o

101000

111

41

p

101001

112

42

q

101010

113

43

r

101011

114

44

s

101100

115

45

t

101101

116

46

u

101110

117

47

v

101111

118

48

w

110000

119

49

x

110001

120

50

y

110010

121

51

z

110011

122

52

0

110100

48

53

1

110101

49

54

2

110110

50

55

3

110111

51

56

4

111000

52

57

5

111001

53

58

6

111010

54

59

7

111011

55

60

8

111100

56

61

9

111101

57

62

+

111110

43

63

/

111111

47

64

= (Padding character)

61

How to Convert Ascii Text to Base64 (Encoder)

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  • Find the Decimal Equivalent of each character. For eg if the word is ABC, then the decimal values are 65,66 and 67 respectively

  • For each of the decimal value of the character, convert to 8 bit binary equivalent 65 - 01000001
    66 - 01000010
    67 - 01000011
    Concatenate without spaces - 010000010100001001000011

  • Divide it into groups of 6 bit - 010000 010100 001001 000011

  • Find the base64 for each of the 6 bits as per the table 010000 is Q 010100 is U 001001 is J 000011 is D Base 64 encoded value for ABC is QUJD

  • Pad it up with = to make up upto 4 characters Like base 64 encoded value for Hello is SGVsbG8=
    Base 64 for A is QQ==

How to convert Base64 to Ascii Text

  • Find the BInary equivalent of the base 64 encoded data. let's take base64 encoded data as QQ==

  • The binary value for Q is 010000 QQ becomes 010000010000 and padded up with == which is empty and can be ignored

  • Extract the 8 bits ignoring the trailing zeros to get 01000001
    Convert to decimal value 0100001 is 65 and represents the character 'A'

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Frequently Asked Questions on Base64 Encoder and Decoder

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  • Base64 or B64 is an encoding system that represents every text char with 6 binary digits. It uses 3 bytes for 4 chars. The ascii character set of 65 chars is used as the basis and every 6 bits of input data is represented by one of the 64 char in the Base64 system. Since it uses radix or the base as 64, it is called Base64 and also as Decode64 or Encode64 depending on whether it is decoding or encoding. The radix for a decimal system is 10, the radix for a hexadecimal system is 16.

  • Base64 encoding or b64 encode is converting binary-text (readable text => binary => Base64 encoded text) Base64 encoding takes 6 bits of a 8 bit char value and converts it to Base64 equivalent of it (see table for the representation in Base64 of the ascii charset). So 2 chars needs 12 bits (1 byte + 4 bits) to encode to 1 symbol in base64 3 chars of text input needs 18 bits (2 bytes + 2 bits) 4 chars of text input needs 24 bits (3 bytes)

  • Base64 decoding or b64 decode is converting Base64 encoded data back to binary from which we get back the readable text . ( Base64 encoded text => binary => readable text)

  • Base64 scheme is used in URL encoding to escape special reserved characters for transmission over internet. It is also useful for image, audio/video, document encoding and transmission over the network It is more compact and a more human readable and understandable format than the binary system of 1's and 0's. Compared to hexadecimal encoding, it encodes more chars with less bytes. Therefore, it is considered more efficient than hexadecimal (Hexadecimal uses 8 bytes for 4 chars, Base64 uses 3 bytes for 4 chars)

  • Padding is done to indicate to the decoder that it is end of the stream and no additional bits for decoding. The padding character used in Base64 is = . The padding char is ignored and used only as an indicator This is most useful when multiple base64 encoding content is sent The base64 encoding takes groups of four 6 bit input (24 bits) to encode 4 chars. When there are less than 24 bits then it uses padding char one or more of padding (=) to fill up the remaining bits to make up the 24 bit.

  • it contains the ascii range of characters with a-z , A-Z and 1-9 and + / and one or two = for padding.

  • 3 bytes which represent 4 chars

  • 6 bits

  • It is converting image binary data to base64 encoded data. It is mostly used for transmission of image and other binary data (audio, video, documents) over network without data loss

  • UTF-8 is the standard encoding used for encoding text. Every character in Unicode has a unique code point. UTF-8 is a variable width encoding format. It uses 1 byte (8 bits) to represent ascii range characters and extends to 2, 3 or 4 bytes to cover full range of charset. UTF-8 is apt for text encoding, Base64 encoding is more suitable for binary form of data. It is fixed length of 6 bits for a char. It does not cover all character set like UTF-8. It's purpose is limited to data transmission without misinterpretation.

  • Hex is base 16 and uses range from 0-9 and A-F. Every char is represented by 2 hexadecimal (8 bits, 2bytes). Base64 uses base as 64 and range from 0-63. It uses 6 bits per char instead of 8 bits and so uses 33% less size. Hex encoding is more compact and simpler readable format. Base64 appears more complex with its larger range and with padding chars.

  • It uses 65 from the ascii charset (64 + 1). The 65th one is used for padding. 64 are used for the actual encoding.

  • Basic authentication is one of the http authentication scheme Base64 is used to encode the user name and password while sending from client to server. The format uses the keyword Authorization: and then followed by the word Basic and the Base64 data. Authorization: Basic dXNlcm5hbWUvcGFzc3dvcmQ= Base64 encoded text can be decoded and it's not secure way of transmission.

  • This is pertaining to email message data transmission especially attachments like images, audio, video , docs etc. The binary form of email message / data is encoded into the plain text format using Base64 or any of other encoding algorithms and shared across email network.

  • MIME stands for Multipurpose Internet Mail Extension . This is a standard for mail exchanges that specifies format and encoding to be used.