Base64 Encode / Decode Calculator for Hobbyists

Text to Encode or Decode

Enter text or Base64 content, choose action and character mode, then process the result. Related: Unit Conversion Calculator and Roman Numeral Converter.

I want to:

Character:

Input

Output

Ready.

Base64 Encode / Decode an Image or File

Use this tool to Base64-encode or decode images and files. For text output, the result appears below with copy and download options. For image and binary output, a generated file will download directly. Large files may require more processing time.

I want to:

Choose file (optional for decode)

Base64 input/output area

Decoded file name

MIME type (optional)

Ready.

What Base64 Encoding and Decoding Does

Base64 encoding and decoding converts binary data to and from text format. Some systems and transport channels handle text more reliably than raw binary, so Base64 is commonly used to move images, files, and other binary content in text-safe contexts.

The Base64 character set contains uppercase A–Z, lowercase a–z, digits 0–9, and two additional characters (+ and /). The symbol = is used as padding in many results.

Base64 Value	Character	Base64 Value	Character	Base64 Value	Character	Base64 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	/

Modern computers use 8-bit bytes, while Base64 uses 6-bit values, so Base64 output is usually about 4/3 (~1.33×) the size of original input data.

Examples

Dog → RG9n

Do → RG8= (padding)

Dogs → RG9ncw== (padding)

Base64 is commonly used for email attachments, JSON/XML payloads, and embedding binary in text contexts, for example: <img src="data:image/png;base64,..." />

Base64 Value	Character	Base64 Value	Character	Base64 Value	Character	Base64 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 Value	Character	Base64 Value	Character	Base64 Value	Character	Base64 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 Encode / Decode

Text to Encode or Decode

Base64 Encode / Decode an Image or File

What Base64 Encoding and Decoding Does

Examples

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Base64 Value	Character	Base64 Value	Character	Base64 Value	Character	Base64 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	/