ASCII Character Set

ASCII is a 7-bit character set containing 128 characters. It includes the numbers 0-9, upper and lower case English letters A-Z / a-z, and a limited set of basic punctuation and symbols.

For plain text responses and compatibility-sensitive workflows, especially simple SMS reply text, it is safest to stay within the standard printable ASCII range.

Printable ASCII Characters

Printable ASCII characters run from decimal 32 to 126.

Character	Decimal	Description
(space)	32	Space
!	33	Exclamation mark
"	34	Quotation mark
#	35	Number sign
$	36	Dollar sign
%	37	Percent sign
&	38	Ampersand
'	39	Apostrophe
(	40	Left parenthesis
)	41	Right parenthesis
*	42	Asterisk
+	43	Plus sign
,	44	Comma
-	45	Hyphen-minus
.	46	Full stop
/	47	Slash
0-9	48-57	Digits zero to nine
:	58	Colon
;	59	Semicolon
<	60	Less-than sign
=	61	Equals sign
>	62	Greater-than sign
?	63	Question mark
@	64	At sign
A-Z	65-90	Uppercase Latin letters
[	91	Left square bracket
\	92	Backslash
]	93	Right square bracket
^	94	Caret
_	95	Underscore
`	96	Grave accent
a-z	97-122	Lowercase Latin letters
{	123	Left curly bracket
|	124	Vertical bar
}	125	Right curly bracket
~	126	Tilde

Notes

• ASCII control characters occupy decimal values 0-31 and 127 and are not printable.
• For SMS specifically, ASCII and GSM are not identical. If you need the GSM SMS alphabet reference, use the GSM Character Set page.