ASCII Table — Complete Character Code Reference

ASCII (American Standard Code for Information Interchange) assigns numeric values to 128 characters. These include control characters (0-31, 127), printable characters (32-126), and the standard Latin alphabet. ASCII is the foundation of virtually all modern character encoding systems including UTF-8.

Control Characters (0-31, 127)

These non-printable characters were originally designed to control hardware devices like printers and telephones. Many still serve purposes in modern computing.

Dec	Hex	Oct	Char	Name	Description
0	00	000	NUL	Null	String terminator in C
1	01	001	SOH	Start of Heading	Start of header
2	02	002	STX	Start of Text	Start of text body
3	03	003	ETX	End of Text	Often used as Ctrl+C (interrupt)
4	04	004	EOT	End of Transmission	Ctrl+D (end of input)
5	05	005	ENQ	Enquiry	Request for response
6	06	006	ACK	Acknowledge	Positive acknowledgement
7	07	007	BEL	Bell	Terminal bell/beep (`\a`)
8	08	010	BS	Backspace	Move cursor back (`\b`)
9	09	011	HT	Horizontal Tab	Tab character (`\t`)
10	0A	012	LF	Line Feed	Newline on Unix/macOS (`\n`)
11	0B	013	VT	Vertical Tab	Vertical tab (`\v`)
12	0C	014	FF	Form Feed	Page break (`\f`)
13	0D	015	CR	Carriage Return	Newline on old Mac; `\r\n` on Windows (`\r`)
14	0E	016	SO	Shift Out	Switch to alternate character set
15	0F	017	SI	Shift In	Return to default character set
16	10	020	DLE	Data Link Escape	Control character for data links
17	11	021	DC1	Device Control 1	XON — resume transmission
18	12	022	DC2	Device Control 2
19	13	023	DC3	Device Control 3	XOFF — pause transmission
20	14	024	DC4	Device Control 4
21	15	025	NAK	Negative Acknowledge	Negative acknowledgement
22	16	026	SYN	Synchronous Idle	Synchronization
23	17	027	ETB	End of Transmission Block	End of data block
24	18	030	CAN	Cancel	Cancel previous data
25	19	031	EM	End of Medium	End of storage medium
26	1A	032	SUB	Substitute	Ctrl+Z (EOF on Windows)
27	1B	033	ESC	Escape	Start of escape sequences
28	1C	034	FS	File Separator	Delimiter
29	1D	035	GS	Group Separator	Delimiter
30	1E	036	RS	Record Separator	Delimiter
31	1F	037	US	Unit Separator	Delimiter
127	7F	177	DEL	Delete	Delete character

Printable Characters (32-126)

Dec	Hex	Oct	Char	Dec	Hex	Oct	Char	Dec	Hex	Oct	Char
32	20	040	(space)	64	40	100	`@`	96	60	140	`
33	21	041	`!`	65	41	101	`A`	97	61	141	`a`
34	22	042	`"`	66	42	102	`B`	98	62	142	`b`
35	23	043	`#`	67	43	103	`C`	99	63	143	`c`
36	24	044	`$`	68	44	104	`D`	100	64	144	`d`
37	25	045	`%`	69	45	105	`E`	101	65	145	`e`
38	26	046	`&`	70	46	106	`F`	102	66	146	`f`
39	27	047	`'`	71	47	107	`G`	103	67	147	`g`
40	28	050	`(`	72	48	110	`H`	104	68	150	`h`
41	29	051	`)`	73	49	111	`I`	105	69	151	`i`
42	2A	052	`*`	74	4A	112	`J`	106	6A	152	`j`
43	2B	053	`+`	75	4B	113	`K`	107	6B	153	`k`
44	2C	054	`,`	76	4C	114	`L`	108	6C	154	`l`
45	2D	055	`-`	77	4D	115	`M`	109	6D	155	`m`
46	2E	056	`.`	78	4E	116	`N`	110	6E	156	`n`
47	2F	057	`/`	79	4F	117	`O`	111	6F	157	`o`
48	30	060	`0`	80	50	120	`P`	112	70	160	`p`
49	31	061	`1`	81	51	121	`Q`	113	71	161	`q`
50	32	062	`2`	82	52	122	`R`	114	72	162	`r`
51	33	063	`3`	83	53	123	`S`	115	73	163	`s`
52	34	064	`4`	84	54	124	`T`	116	74	164	`t`
53	35	065	`5`	85	55	125	`U`	117	75	165	`u`
54	36	066	`6`	86	56	126	`V`	118	76	166	`v`
55	37	067	`7`	87	57	127	`W`	119	77	167	`w`
56	38	070	`8`	88	58	130	`X`	120	78	170	`x`
57	39	071	`9`	89	59	131	`Y`	121	79	171	`y`
58	3A	072	`:`	90	5A	132	`Z`	122	7A	172	`z`
59	3B	073	`;`	91	5B	133	`[`	123	7B	173	`{`
60	3C	074	`<`	92	5C	134	`\`	124	7C	174	`\|`
61	3D	075	`=`	93	5D	135	`]`	125	7D	175	`}`
62	3E	076	`>`	94	5E	136	`^`	126	7E	176	`~`
63	3F	077	`?`	95	5F	137	`_`

Key Ranges

Range	Dec	Hex	Contents
Control chars	0-31	00-1F	Non-printable control codes
Space	32	20	The space character
Digits 0-9	48-57	30-39	Numeric characters
Uppercase A-Z	65-90	41-5A	Capital letters
Lowercase a-z	97-122	61-7A	Lowercase letters
DEL	127	7F	Delete control character

Useful Conversions

# Uppercase to lowercase: add 32
'A' (65) + 32 = 'a' (97)

# Lowercase to uppercase: subtract 32
'a' (97) - 32 = 'A' (65)

# Digit char to number: subtract 48
'7' (55) - 48 = 7

# Number to digit char: add 48
7 + 48 = '7' (55)

# Check if printable: 32 <= code <= 126

ASCII vs Unicode

ASCII covers only 128 characters (7 bits). Unicode extends this to over 149,000 characters across all writing systems. UTF-8, the dominant encoding on the web, is backward-compatible with ASCII: the first 128 UTF-8 code points are identical to ASCII.

Explore the full table interactively with the ASCII Table tool, or convert between formats with ASCII to Hex and Hex to Text.