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Base64 Encoder

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Convert your text to Base64 quickly and easily

Use this free online tool to encode your strings or texts into Base64 format. Fast, secure, and easy to use. No registration or installation required.

Base64 Encoder - Convert texts & strings to Base64 Instantly

Base64 encode

The Base64 Encoder is a simple and efficient online tool that converts text into a Base64-encoded string. Base64 encoding is commonly used for transmitting data in formats that require text-based representations, such as JSON, XML, or URL parameters.

How It Works

Base64 encoding converts raw data into a set of ASCII characters using a predefined encoding scheme. This process ensures compatibility when transferring data through text-based protocols. The encoded output depends on the specific implementation but any of them base on some common rules:

  • a set of 64 characters only (quite obvious);
  • the character set is part of a subset common to most encodings;
  • characters are all printable.

Different implementations are possible. As an example "RFC 4648" defines the characters set as only letters (A-Z, a-z) and numbers (0-9) for the first 62 characters, and plus (+) and slash (/) symbols as last 2 characters - padding equal symbol (=) is used when necessary. "RFC 4648 / Base64URL" variant differs from the previous one for the last 2 character. It uses minus (-) and underscore (_) as they are URL safe.

Common Use Cases

  • Embedding images or fonts in HTML/CSS
  • Encoding binary files for safe transmission via email or APIs
  • Storing data in text-based formats without corruption
  • Securely encoding credentials (though Base64 is not encryption)

How to Use

Enter your text: input or paste the string you want to encode into the input field.
Encode: click the "Encode" button to convert the string.
Get the result: copy the Base64-encoded result for use in your project.

This tool ensures quick and reliable Base64 encoding, making it a must-have utility for developers working with data serialization, APIs, or web applications.

The conversion process (encoding)

To convert a string into its Base64 format we need to follow these steps that represent the Base64 encoding algorithm:

Convert any symbol into its ASCII number representation - for example A is 65, t is 116.
Convert any number coming from the previous step into the binary version - for example 70 is 01000110.
Concatenate all the binary numbers and create packs of 6 bits (6 bits have a maximum of 64 different binary values).
Convert any 6 bits pack into a decimal number and us it as a index on the Base64 table map to find the corresponding value.

Let's have a pratical example. For example into the phrase:

I am your Father
We want to convert "Father" in Base64.

Original F a t h e r
ASCII 70 97 116 104 101 114
Binary 0 1 0 0 0 1 1 0 0 1 1 0 0 0 0 1 0 1 1 1 0 1 0 0 0 1 1 0 1 0 0 0 0 1 1 0 0 1 0 1 0 1 1 1 0 0 1 0
Index 17 38 5 52 26 6 21 50
Base64 R m F 0 a G V y
Final result RmF0aGVy

Base64 table from RFC 4648

Base64 Table 1/4
Index ASCII
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
Base64 Table 2/4
Index ASCII
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
Base64 Table 3/4
Index ASCII
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
Base64 Table 4/4
Index ASCII
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 /