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Online Base64 Decoder: Decode Base64 Text or File

Untangling encoded data should not be a difficult task. Use our Online Base64 Decoder, your go-to tool for effortlessly reversing Base64 encoding and gaining access to the original data.

Base64 Decoder

Input Type

Text File

What is Base64?

Base64 is a binary-to-text encoding system that is often used to encode binary data, particularly when such data needs to be saved and transported across text-based medium. This encoding helps to ensure that the data remains unchanged throughout transit.

Base64 is widely used in a variety of applications, including email via MIME and storing complicated data in XML or JSON.

The binary data is initially separated into 6-bit blocks in Base64 encoding. These blocks are then represented in ASCII standard as 64 separate printable characters: A-Z, a-z, 0-9, +, and /. This is why it is known as “Base64”.

What is Base64 Decoding?

Base64 decoding, at its core, is the process of converting Base64-encoded data back to its original binary format. The encoding scheme is reversed in this process, and characters from the set of 64 ASCII characters are transformed into binary representations. Base64 decoding recovers the original data and allows you to access, read, and use it as intended.

Base64 Decoding in 4 simple steps - Infographic

How Does Base64 Decoding Work?

Here’s how Base64 decoding works:

  1. Map Base64 characters to binary: Each character in the Base64 encoded string is mapped back to its 6-bit binary representation. The 64 characters (A-Z, a-z, 0-9, +, /) correspond to the values 0-63.
  2. Reassemble bytes: The 6-bit blocks are then reassembled into 8-bit bytes (octets). This is done by concatenating the 6-bit blocks two at a time to form the original bytes.
  3. Remove padding if necessary: If there are any padding characters (=), they are removed to get the final decoded output.

Why Use Base64 Decoding?

Base64 decoding is essential in digital communication and data manipulation. Encoded data may be encountered during data transmission, file sharing, or when interacting with cryptographic protocols. You regain the ability to work with the original information by decoding Base64 data, ensuring seamless integration and meaningful utilization.

What is the Purpose of our Free Online Base64 Decoder?

Our free online Base64 Decoder provides a simple platform for decoding Base64 data, whether in the form of text or files. This tool, which has been designed to be user-friendly and accessible, eliminates the need for complex software installations or coding expertise. You can decode Base64-encoded data and harness its potential with just a few clicks, contributing to more effective communication and data handling.

How Do I Use the Free Online Base64 Decoder?

  1. In the input field, enter the text you want to decode or upload a file.
  2. Customise the settings, you can set each line to be decoded separately.
  3. No need to press a button, the decoded result will automatically appear in the Output field.
  4. If you want, you can copy the result using the Copy button.

Is It Secure To Use Your Base64 Converter?

Absolutely. Our program operates entirely on the client side, which means all the conversion processes occur within your browser. No data is sent to our servers, ensuring that your information remains under your control and confidential throughout the conversion process.

Why Base64 is not an encryption? Infographic with 5 reasons

Is It A Base64 Decrypter?

Remember that Base64 decoding will only produce meaningful results if the input was Base64 encoded to begin with. It’s not a method for decrypting or uncompressing data.

Base64 Characters and Table

Uppercase letters (A-Z), lowercase letters (a-z), digits (0-9), and two additional characters, typically “+” and “/”, comprise the set of 64 ASCII characters used in Base64 encoding. When the length of the binary data is not a multiple of three bytes, the “=” character is also used for padding.

ValueCharacterBinary Value
0A000000
1B000001
2C000010
3D000011
4E000100
5F000101
6G000110
7H000111
8I001000
9J001001
10K001010
11L001011
12M001100
13N001101
14O001110
15P001111
16Q010000
17R010001
18S010010
19T010011
20U010100
21V010101
22W010110
23X010111
24Y011000
25Z011001
26a011010
27b011011
28c011100
29d011101
30e011110
31f011111
32g100000
33h100001
34i100010
35j100011
36k100100
37l100101
38m100110
39n100111
40o101000
41p101001
42q101010
43r101011
44s101100
45t101101
46u101110
47v101111
48w110000
49x110001
50y110010
51z110011
520110100
531110101
542110110
553110111
564111000
575111001
586111010
597111011
608111100
619111101
62+111110
63/111111