Encode "Hello"
text = Hellomode = encode
Result: 72 101 108 108 111
ASCII Converter
Convert text to its ASCII decimal representation (e.g. A → 65, z → 122) or decode ASCII codes back to text. ASCII encodes 128 characters (0-127) including letters, digits, punctuation, and control characters. For characters outside ASCII range, UTF-8 byte values are shown.
Privacy: this tool processes your data entirely in your browser. Nothing you paste or type is sent to the server.
Enter your values and press Calculate — the result appears here.
Worked examples
Decode ASCII
text = 72 101 108 108 111mode = decode
Result: Hello
Frequently asked questions
What is ASCII?
ASCII (American Standard Code for Information Interchange) is a character encoding standard that maps characters to numbers 0-127. It includes English letters (uppercase and lowercase), digits, punctuation, and control characters.
What about characters outside ASCII range?
Characters above 127 (like é, ñ, or emoji) are encoded as their UTF-8 byte values. For example, é (U+00E9) becomes 195 169 in UTF-8. Use the Unicode Encoder for code point representation.
Is my data sent to a server?
No. All conversion happens in your browser. Nothing is transmitted anywhere.
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