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Base64 Enc/Dec

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Introduction to Base64 Decoder Tool

Our Base64 Decoder Tool provides an efficient solution for encoding and decoding strings using Base64 format. This tool allows you to encrypt strings into Base64 format and decode Base64 encrypted strings back to plain text.

Using our online Base64 Decoder tool is straightforward:

  • Base64 Encoding: Encode strings into Base64 format to prevent data corruption and support various encoding needs.
  • Base64 Decoding: Decode Base64 encoded strings back to readable plain text format.
  • Chinese Character Support: Effectively avoid Chinese character garbling by encoding them in different ways.

Key features of our Base64 Decoder Tool include:

  • Simple Encoding/Decoding: Easily encode and decode strings using Base64 format.
  • Data Integrity: Ensure data integrity and readability through Base64 encoding and decoding.
  • Privacy Assurance: Your information is not recorded, ensuring privacy and security.

Whether you need to encode data to prevent corruption or decode Base64 strings back to plain text, our Base64 Decoder Tool provides a reliable and user-friendly solution.

Base64 Index Table

Base64 encoding uses 64 printable ASCII characters (A-Z, a-z, 0-9, +, /) to encode any byte sequence into an ASCII string, with the "=" symbol used as a suffix.

Numeric Value Character Numeric Value Character Numeric Value Character Numeric Value Character
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 /

  Base64 divides the input string into bytes, obtains the binary value corresponding to each byte (padding with zeros if less than 8 bits), concatenates these binary values, then splits them into groups of 6 bits (because 2^6=64), and pads the last group with zeros if it's less than 6 bits. Convert each group of binary values to decimal, then find the corresponding symbol in the table above and concatenate them to get the Base64 encoding result.

  Base64 is used for encoding the underlying binary data of arbitrary data, especially in cases where only ASCII characters can be transmitted. However, it is most commonly used for processing and transmitting text data, such as in MIME-formatted emails. Base64 can be used to encode email content, ensuring smooth transmission between computers in different languages without garbled characters. It's important to note that this ensures transmission rather than display. For example, UTF-8 encoding can display Chinese characters correctly on computers in Western Europe (with the corresponding font installed), but it may not ensure smooth transmission of Chinese characters. In such cases, converting to Base64 eliminates this concern.

If no specific instructions are given, Base64 encoding is generally understood to encode non-ASCII characters according to the UTF-8 character set.

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