Alphabets to Base64 Conversion Table:
| Value (Decimal) | Base64 Character |
|---|---|
| 0 | A |
| 1 | B |
| 2 | C |
| 3 | D |
| 4 | E |
| 5 | F |
| 6 | G |
| 7 | H |
| 8 | I |
| 9 | J |
| 10 | K |
| 11 | L |
| 12 | M |
| 13 | N |
| 14 | O |
| 15 | P |
| 16 | Q |
| 17 | R |
| 18 | S |
| 19 | T |
| 20 | U |
| 21 | V |
| 22 | W |
| 23 | X |
| 24 | Y |
| 25 | Z |
| 26 | a |
| 27 | b |
| 28 | c |
| 29 | d |
| 30 | e |
| 31 | f |
| 32 | g |
| 33 | h |
| 34 | i |
| 35 | j |
| 36 | k |
| 37 | l |
| 38 | m |
| 39 | n |
| 40 | o |
| 41 | p |
| 42 | q |
| 43 | r |
| 44 | s |
| 45 | t |
| 46 | u |
| 47 | v |
| 48 | w |
| 49 | x |
| 50 | y |
| 51 | z |
| 52 | 0 |
| 53 | 1 |
| 54 | 2 |
| 55 | 3 |
| 56 | 4 |
| 57 | 5 |
| 58 | 6 |
| 59 | 7 |
| 60 | 8 |
| 61 | 9 |
| 62 | + |
| 63 | / |
ASCII to Base64 Conversion
In Base64 encoding, every three 8-bit ASCII characters (3 bytes = 24 bits) are converted into four 6-bit Base64 characters. Below is an example table for some common text characters and their Base64 equivalents.
| Text/Character | ASCII (Binary) | Base64 Chunks | Base64 Characters |
|---|---|---|---|
| H | 01001000 | 010010 | S |
| e | 01100101 | 011001 | Z |
| l | 01101100 | 011011 | b |
| l | 01101100 | 011011 | b |
| o | 01101111 | 011011 | b |
| , | 00101100 | 001011 | L |
| Space | 00100000 | 001000 | I |
| W | 01010111 | 010101 | V |
| o | 01101111 | 011011 | b |
| r | 01110010 | 011100 | c |
| l | 01101100 | 011011 | b |
| d | 01100100 | 011001 | Z |
For example, if you encode “Hello, World” in Base64, the result is:
“SGVsbG8sIFdvcmxk”
Explanation:
- H -> Binary:
01001000, Base64 ->S - e -> Binary:
01100101, Base64 ->Z - l -> Binary:
01101100, Base64 ->b - l -> Binary:
01101100, Base64 ->b - o -> Binary:
01101111, Base64 ->b - , -> Binary:
00101100, Base64 ->L - Space -> Binary:
00100000, Base64 ->I - W -> Binary:
01010111, Base64 ->V - o -> Binary:
01101111, Base64 ->b - r -> Binary:
01110010, Base64 ->c - l -> Binary:
01101100, Base64 ->b - d -> Binary:
01100100, Base64 ->Z
Padding:
If the input data length isn’t divisible by 3, Base64 uses padding characters = to ensure the output length is always a multiple of 4.
For example, “Man” is encoded as “TWFu” without padding because it fits perfectly into three 8-bit ASCII characters, but “Ma” would be “TWE=” (with padding).