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.

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.

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.

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.

Value	Character	Binary Value
0	A	000000
1	B	000001
2	C	000010
3	D	000011
4	E	000100
5	F	000101
6	G	000110
7	H	000111
8	I	001000
9	J	001001
10	K	001010
11	L	001011
12	M	001100
13	N	001101
14	O	001110
15	P	001111
16	Q	010000
17	R	010001
18	S	010010
19	T	010011
20	U	010100
21	V	010101
22	W	010110
23	X	010111
24	Y	011000
25	Z	011001
26	a	011010
27	b	011011
28	c	011100
29	d	011101
30	e	011110
31	f	011111
32	g	100000
33	h	100001
34	i	100010
35	j	100011
36	k	100100
37	l	100101
38	m	100110
39	n	100111
40	o	101000
41	p	101001
42	q	101010
43	r	101011
44	s	101100
45	t	101101
46	u	101110
47	v	101111
48	w	110000
49	x	110001
50	y	110010
51	z	110011
52	0	110100
53	1	110101
54	2	110110
55	3	110111
56	4	111000
57	5	111001
58	6	111010
59	7	111011
60	8	111100
61	9	111101
62	+	111110
63	/	111111