What are codes 0–31 used for?

Control characters — non-printable codes used for terminal control. Examples: 0 (NUL), 7 (BEL — terminal beep), 9 (TAB), 10 (LF — line feed), 13 (CR — carriage return), 27 (ESC). Most aren't visible in modern apps but appear in protocols and file formats.

Why does ASCII stop at 127?

ASCII is a 7-bit code (2^7 = 128 values). The 8th bit became 'extended ASCII' (codes 128–255) but those varied by codepage — Latin-1, Windows-1252, etc. Modern systems use UTF-8 instead, which is a superset of ASCII for the first 128 values.

What's the difference between LF and CRLF line endings?

Unix and macOS use LF (10) alone. Windows uses CR+LF (13, 10). Old classic Mac used CR alone. Most modern tools handle all three, but Git, Python, and HTTP have explicit conventions you should be aware of.

ascii · 0-127 · hex · binary · local

The complete ASCII table

All 128 ASCII codepoints with decimal, hex, octal, and binary representations. Filter by any field, click any row to copy the character.

ASCII Table

Total

128

ASCII codes

Visible

128

all

Range

0–127

7-bit

Output

4.7 KB

ready

info · about ascii

ASCII (American Standard Code for Information Interchange) maps 128 codepoints to 7-bit integers. Codes 0–31 and 127 are control characters; 32 is space; 33–126 are printable.

• 0–31 / 127 — control codes (CR, LF, DEL...)

• 32 — space, 33–47 punctuation

• 48–57 — digits 0–9

• 65–90 — A–Z uppercase

• 97–122 — a–z lowercase

Click any row to copy that character. Filter by any field above.

output · table (128)

Dec	Hex	Octal	Binary	Char	Desc
0	0x00	0000	00000000	·	NUL
1	0x01	0001	00000001	·	SOH
2	0x02	0002	00000010	·	STX
3	0x03	0003	00000011	·	ETX
4	0x04	0004	00000100	·	EOT
5	0x05	0005	00000101	·	ENQ
6	0x06	0006	00000110	·	ACK
7	0x07	0007	00000111	·	BEL
8	0x08	0010	00001000	·	BS
9	0x09	0011	00001001	·	HT
10	0x0A	0012	00001010	·	LF
11	0x0B	0013	00001011	·	VT
12	0x0C	0014	00001100	·	FF
13	0x0D	0015	00001101	·	CR
14	0x0E	0016	00001110	·	SO
15	0x0F	0017	00001111	·	SI
16	0x10	0020	00010000	·	DLE
17	0x11	0021	00010001	·	DC1
18	0x12	0022	00010010	·	DC2
19	0x13	0023	00010011	·	DC3
20	0x14	0024	00010100	·	DC4
21	0x15	0025	00010101	·	NAK
22	0x16	0026	00010110	·	SYN
23	0x17	0027	00010111	·	ETB
24	0x18	0030	00011000	·	CAN
25	0x19	0031	00011001	·	EM
26	0x1A	0032	00011010	·	SUB
27	0x1B	0033	00011011	·	ESC
28	0x1C	0034	00011100	·	FS
29	0x1D	0035	00011101	·	GS
30	0x1E	0036	00011110	·	RS
31	0x1F	0037	00011111	·	US
32	0x20	0040	00100000	␣	Space
33	0x21	0041	00100001	!	Punctuation / symbol
34	0x22	0042	00100010	"	Punctuation / symbol
35	0x23	0043	00100011	#	Punctuation / symbol
36	0x24	0044	00100100	$	Punctuation / symbol
37	0x25	0045	00100101	%	Punctuation / symbol
38	0x26	0046	00100110	&	Punctuation / symbol
39	0x27	0047	00100111	'	Punctuation / symbol
40	0x28	0050	00101000	(	Punctuation / symbol
41	0x29	0051	00101001	)	Punctuation / symbol
42	0x2A	0052	00101010	*	Punctuation / symbol
43	0x2B	0053	00101011	+	Punctuation / symbol
44	0x2C	0054	00101100	,	Punctuation / symbol
45	0x2D	0055	00101101	-	Punctuation / symbol
46	0x2E	0056	00101110	.	Punctuation / symbol
47	0x2F	0057	00101111	/	Punctuation / symbol
48	0x30	0060	00110000	0	Digit
49	0x31	0061	00110001	1	Digit
50	0x32	0062	00110010	2	Digit
51	0x33	0063	00110011	3	Digit
52	0x34	0064	00110100	4	Digit
53	0x35	0065	00110101	5	Digit
54	0x36	0066	00110110	6	Digit
55	0x37	0067	00110111	7	Digit
56	0x38	0070	00111000	8	Digit
57	0x39	0071	00111001	9	Digit
58	0x3A	0072	00111010	:	Punctuation / symbol
59	0x3B	0073	00111011	;	Punctuation / symbol
60	0x3C	0074	00111100	<	Punctuation / symbol
61	0x3D	0075	00111101	=	Punctuation / symbol
62	0x3E	0076	00111110	>	Punctuation / symbol
63	0x3F	0077	00111111	?	Punctuation / symbol
64	0x40	0100	01000000	@	Punctuation / symbol
65	0x41	0101	01000001	A	Uppercase letter
66	0x42	0102	01000010	B	Uppercase letter
67	0x43	0103	01000011	C	Uppercase letter
68	0x44	0104	01000100	D	Uppercase letter
69	0x45	0105	01000101	E	Uppercase letter
70	0x46	0106	01000110	F	Uppercase letter
71	0x47	0107	01000111	G	Uppercase letter
72	0x48	0110	01001000	H	Uppercase letter
73	0x49	0111	01001001	I	Uppercase letter
74	0x4A	0112	01001010	J	Uppercase letter
75	0x4B	0113	01001011	K	Uppercase letter
76	0x4C	0114	01001100	L	Uppercase letter
77	0x4D	0115	01001101	M	Uppercase letter
78	0x4E	0116	01001110	N	Uppercase letter
79	0x4F	0117	01001111	O	Uppercase letter
80	0x50	0120	01010000	P	Uppercase letter
81	0x51	0121	01010001	Q	Uppercase letter
82	0x52	0122	01010010	R	Uppercase letter
83	0x53	0123	01010011	S	Uppercase letter
84	0x54	0124	01010100	T	Uppercase letter
85	0x55	0125	01010101	U	Uppercase letter
86	0x56	0126	01010110	V	Uppercase letter
87	0x57	0127	01010111	W	Uppercase letter
88	0x58	0130	01011000	X	Uppercase letter
89	0x59	0131	01011001	Y	Uppercase letter
90	0x5A	0132	01011010	Z	Uppercase letter
91	0x5B	0133	01011011	[	Punctuation / symbol
92	0x5C	0134	01011100	\	Punctuation / symbol
93	0x5D	0135	01011101	]	Punctuation / symbol
94	0x5E	0136	01011110	^	Punctuation / symbol
95	0x5F	0137	01011111	_	Punctuation / symbol
96	0x60	0140	01100000	`	Punctuation / symbol
97	0x61	0141	01100001	a	Lowercase letter
98	0x62	0142	01100010	b	Lowercase letter
99	0x63	0143	01100011	c	Lowercase letter
100	0x64	0144	01100100	d	Lowercase letter
101	0x65	0145	01100101	e	Lowercase letter
102	0x66	0146	01100110	f	Lowercase letter
103	0x67	0147	01100111	g	Lowercase letter
104	0x68	0150	01101000	h	Lowercase letter
105	0x69	0151	01101001	i	Lowercase letter
106	0x6A	0152	01101010	j	Lowercase letter
107	0x6B	0153	01101011	k	Lowercase letter
108	0x6C	0154	01101100	l	Lowercase letter
109	0x6D	0155	01101101	m	Lowercase letter
110	0x6E	0156	01101110	n	Lowercase letter
111	0x6F	0157	01101111	o	Lowercase letter
112	0x70	0160	01110000	p	Lowercase letter
113	0x71	0161	01110001	q	Lowercase letter
114	0x72	0162	01110010	r	Lowercase letter
115	0x73	0163	01110011	s	Lowercase letter
116	0x74	0164	01110100	t	Lowercase letter
117	0x75	0165	01110101	u	Lowercase letter
118	0x76	0166	01110110	v	Lowercase letter
119	0x77	0167	01110111	w	Lowercase letter
120	0x78	0170	01111000	x	Lowercase letter
121	0x79	0171	01111001	y	Lowercase letter
122	0x7A	0172	01111010	z	Lowercase letter
123	0x7B	0173	01111011	{	Punctuation / symbol
124	0x7C	0174	01111100	\|	Punctuation / symbol
125	0x7D	0175	01111101	}	Punctuation / symbol
126	0x7E	0176	01111110	~	Punctuation / symbol
127	0x7F	0177	01111111	·	DEL

Quick Start

Read & filter the ASCII table

Every code is shown in four bases plus its glyph and meaning. Filter by typing any value in any column.

01
Scan the columns
Decimal, hex, octal, binary all line up.
Inputs are treated as UTF-8 throughout the pipeline and validated client-side as you type — nothing dispatches until the value is well-formed.
basesinpututf-8client-sidevalidated
row · text65 · set
```
65  0x41  0101  01000001  A
```
loaded · parsedclient-side
02
Filter to narrow
Type a number, hex pair, char, or description.
Each toggle re-computes through a memoised hook, so flipping options never resets your input and the UI stays snappy on large inputs.
filteroptionslivememoisedtoggles
q · memoiseddigit · live
```
Matches 0-9
```
options set · memoisedlive
03
Click a row
The printable character is copied to your clipboard.
Randomness — where used — comes from crypto.getRandomValues, never Math.random. Heavy work sits in useMemo.
copycomputeinstantlocaldeterministic
click · instant65 · computed
```
Copied "A"
```
computed · instantinstant
04
Export the table
Copy the full filtered set or download as TXT.
Copy writes through navigator.clipboard and downloads use a Blob — zero network traffic. Same input plus same options always yield the same bytes.
exportcopydownloadzero-networkreproducible
ok · copiedtxt · copied
```
128 rows
```
shipped · ready to shipsuccess

Pro tips

Pro tips for everyday utilities

Reach for crypto.getRandomValues

Cryptographically random for IDs, tokens, salts. Math.random is for animation and games, not security.

Sort IDs lexicographically

UUID v4 has no time ordering. Use ULID or UUID v7 if you need sorted IDs.

Mock data with seeds

Faker-style libraries can be seeded so tests are reproducible. Embed the seed in the fixture file.

Reference cards beat memory

Cheatsheets for Vim, Git, Docker, Linux signals are faster than man pages when you’re mid-flow.

Browser APIs vary

Touch events, gamepads, and clipboard differ across vendors. Feature-detect before use.

Persist in the right place

localStorage for user preferences, sessionStorage for transient state, IndexedDB for structured data.

Use Cases

Why an ASCII table

Encoding debugging, low-level programming, education.

Decode mystery bytes

Translate a stream of decimal or hex into readable text. Random values come from crypto.getRandomValues — cryptographically secure for tokens, salts, and session IDs. Math.random is deterministic enough for animations but predictable enough to be a security bug.

CSPRNG-backed

Embedded systems

Look up control codes when sending bytes to peripherals. Pair with hashids, ULID, or UUID v7 when you need both random and sortable — useful for primary keys, public-facing IDs, and event log ordering without a sequence column.

reproducible

Regex character ranges

Pick the exact codepoints when writing [\x20-\x7e]. Output is deterministic given the same seed, so fixtures and tests stay reproducible across CI runs and contributor machines. Embed the seed in the fixture file for full replay.

snappy

Bitwise tricks

Toggle bit 0x20 to flip letter case. Heavy work runs through useMemo so the UI stays snappy on large inputs. Same input + same options yields identical bytes — the kind of stability snapshot tests rely on.

feature-detected

CSV/protocol authoring

Pick delimiters: 0x1F unit, 0x1E record. Storage tools persist to the right backend: localStorage for user preferences, sessionStorage for transient state, IndexedDB for structured data. Pick the right shelf and quota worries disappear.

deterministic

Teaching

Show students how text is just numbers under the hood. Browser feature detection: clipboard, fullscreen, gamepad, and Web Bluetooth APIs gracefully fall back when unavailable. No surprise white screens on Safari or older Firefox.

production-ready

FAQ

Frequently asked questions

What's beyond 127?

ASCII only defines 0-127. Codes 128-255 vary by extended encoding (Latin-1, Windows-1252, etc). Use Unicode for full Unicode support.

Why are 0-31 invisible?

They are control characters — CR, LF, BEL, etc. Not glyphs. We show a placeholder dot.

What's the difference between 0x and \u?

0x is hex; \u is a Unicode escape (e.g. \u0041 = A). For ASCII the values match.

Can I copy multiple chars?

Use Copy table to grab the full filtered list as tab-separated text.

Is anything sent to a server?

No. The whole table is bundled with the page — everything runs locally in your browser.

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