Base64 Decoder

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Background Information

Base64 encoding is used to transmit binary data in an ASCII format. Typical usage is to embed image data within scripts such as CSS.

Various programming languages allow you to encode binary data (or even text) using built in APIs. For instance, in C# ToBase64String method of System.Convert class does this. This method takes a byte array as input. Typically this is some sort of binary data that cannot be transferred over the wire without corruption. However, you can also convert text into byte[] and then encode it using base64. You should question why this is needed because it is not the intended use of Base-64 encoding. In this form, you are just wasting bytes to represent your text data.

Checkout the Programming Languages section below for a list of APIs for other languages. Read more at wikipedia

More Information
Programming Languages

Example Substitutions

Value	Char
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`

Value	Char
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`

Value	Char
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`

Value	Char
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	`/`

How to do Base64 encoding in various programming languages

- Language: C#
- Encode: System.Convert.ToBase64String()
- Decode: System.Convert.FromBase64String()
- Example: Example
- Documentation: Documentation
- Language: VB .NET
- Encode: System.Convert.ToBase64String()
- Decode: System.Convert.FromBase64String()
- Example: Example
- Documentation: Documentation
- Language: Java 8+
- Encode: java.util.Base64.getEncoder().encode()
- Decode: java.util.Base64.getDecoder().decode()
- Example: Example
- Documentation: Documentation
- Language: Java 7 or less
- Encode: org.apache.commons.codec.binary.Base64.encodeBase64()
- Decode: org.apache.commons.codec.binary.Base64.decodeBase64()
- Example: Example
- Documentation: Documentation
- Language: JavaScript
- Encode: btoa()
- Decode: atob()
- Example: btoa() atob()
- Documentation: Documentation
- Language: Python
- Encode: base64.b64encode()
- Decode: base64.b64decode()
- Example: Example
- Documentation: Documentation
- Language: Ruby
- Encode: Base64.encode64()
- Decode: Base64.decode64()
- Example: Example
- Documentation: Documentation

`Ctrl` + `Alt` + `H`	Open this Help
`Ctrl` + `Alt` + `Shift` + `S`	Configure Global Settings
`Ctrl` + `Alt` + `Enter`	Decode (Submit)
`Ctrl` + `Alt` + `Backspace`	Clear Output
`Ctrl` + `Alt` + `Shift` + `F`	Fullscreen Input
`Ctrl` + `Alt` + `F`	Fullscreen Output
`Ctrl` + `Alt` + `D`	Download Output
`Ctrl` + `Alt` + `C`	Copy Output
`Ctrl` + `Alt` + `U`	Focus URL Textbox
`Enter` (inside URL text box)	Load URL
`Ctrl` + `Alt` + `L`	Load Input File
`Ctrl` + `Alt` + `E`	Load Example
`Ctrl` + `Alt` + `I`	Focus Input Editor
`Ctrl` + `Alt` + `O`	Focus Output Editor
`Ctrl` + `Alt` + `Shift` + `Up`	Expand All Output
`Ctrl` + `Alt` + `Shift` + `Down`	Collapse All Output
`Ctrl` + `Alt` + `W`	Open With Output Menu

Updated: Oct 1, 2017

Filename:

File Size:

Input: Paste base64 encoded text below

Output: Decoded text

Background Information

Example Substitutions

How to do Base64 encoding in various programming languages

Value	Char
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`

Value	Char
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`

Value	Char
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`

Value	Char
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	`/`

Value	Char
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`

Value	Char
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`

Value	Char
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`

Value	Char
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	`/`

Value	Char
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`

Value	Char
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`

Value	Char
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`

Value	Char
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	`/`