Base64 Encoder/Decoder

Convert text to Base64 encoding or decode Base64 to text with this easy-to-use tool.

Length: 0 characters
Length: 0 characters
Examples
Example 1: Basic Text Encoding
Original Text: Hello World
Base64 Encoded: SGVsbG8gV29ybGQ=
Example 2: Special Characters
Original Text: Special @#$% characters!
Base64 Encoded: U3BlY2lhbCBAIyQlIGNoYXJhY3RlcnMh
Example 3: URL-Safe Encoding
Original Text: URL+Safe/Encoding
Standard Base64: VVJMK1NhZmUvRW5jb2Rpbmc=
URL-safe Base64: VVJMK1NhZmUvRW5jb2Rpbmc=
About Base64 Encoding
What is Base64?

Base64 is a binary-to-text encoding scheme that represents binary data in an ASCII string format by translating it into a radix-64 representation. The term Base64 originates from a specific MIME content transfer encoding.

How Base64 Works

Base64 encoding converts binary data into a set of 64 characters (A-Z, a-z, 0-9, + and /) that can be safely transmitted over text-based protocols. The process works as follows:

  1. Each three bytes (24 bits) of binary data are divided into four 6-bit groups
  2. Each 6-bit group is converted to a character from the Base64 character set
  3. If the input length is not divisible by 3, padding characters (=) are added to make the output length a multiple of 4
Common Uses of Base64
  • Email Attachments: MIME uses Base64 to encode binary attachments
  • Data URIs: Embedding images directly in HTML or CSS
  • API Communication: Safely transmitting binary data in JSON
  • Cookies and Web Storage: Storing complex data structures
  • Basic Authentication: Encoding username and password pairs
URL-Safe Base64

Standard Base64 uses the characters + and / which have special meanings in URLs. URL-safe Base64 replaces these with - and _ respectively, making the encoded strings safe for use in URLs without additional encoding.

Note: Base64 encoding increases the data size by approximately 33% (4 characters for every 3 bytes of data), making it less efficient for storage but more reliable for transmission.
Tool Features
  • Encode Text to Base64: Convert any text or string to Base64 format
  • Decode Base64 to Text: Convert Base64 encoded data back to plain text
  • URL-Safe Encoding/Decoding: Support for URL-safe Base64 variant
  • Auto-Detection: Automatically detect standard or URL-safe encoding
  • Copy to Clipboard: One-click copying of results
  • Download Results: Save encoded or decoded output as a file
Base64 Character Set
Value Char Value Char Value Char Value Char
0 A 16 Q 32 g 48 w
1 B 17 R 33 h 49 x
2 C 18 S 34 i 50 y
3 D 19 T 35 j 51 z
4 E 20 U 36 k 52 0
5 F 21 V 37 l 53 1
6 G 22 W 38 m 54 2
7 H 23 X 39 n 55 3
8 I 24 Y 40 o 56 4
9 J 25 Z 41 p 57 5
10 K 26 a 42 q 58 6
11 L 27 b 43 r 59 7
12 M 28 c 44 s 60 8
13 N 29 d 45 t 61 9
14 O 30 e 46 u 62 +
15 P 31 f 47 v 63 /
URL-safe variant: + is replaced with - and / is replaced with _
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