ASCII Table and Text Converter
Look up ASCII codes, convert characters to decimal/hex/binary, and encode text as ASCII values.
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ASCII Table and Text Converter Part of our complete guide to this topic — see the full series. ASCII is the foundation of text encoding. Published in 1963, its 128-character map underpins every modern encoding standard. This guide covers the table, character lookup, and conversion in multiple programming languages. --- All the tools discussed here are available for free at theproductguy.in — client-side, no sign-up required. What is the brief history of ASCII? ASCII emerged from earlier telegraph and teletype codes. Bob Bemer (IBM) and others standardized it through the American Standards Association, with the final 1963 edition adopted as ASA X3.4-1963. The 1967 revision added lowercase letters and settled on the layout still in use today. Before ASCII, every computer manufacturer used…
Frequently Asked Questions
What is ASCII?
ASCII (American Standard Code for Information Interchange) is a character encoding standard published in 1963. It maps 128 characters — letters, digits, punctuation, and control codes — to integers 0–127. Every modern text encoding, including UTF-8, is backward compatible with ASCII for those 128 characters.
How do I convert a character to its ASCII code?
In Python, use ord('A') which returns 65. In JavaScript, use 'A'.charCodeAt(0) which also returns 65. To go the other direction, chr(65) in Python and String.fromCharCode(65) in JavaScript both return 'A'. For manual lookup, 'A' is 65, 'a' is 97, '0' is 48, and space is 32.
What is the ASCII code for a space?
The ASCII code for a space character is 32 (decimal), 0x20 (hexadecimal), and 00100000 (8-bit binary). It is the first printable character in ASCII, positioned just before the exclamation mark at 33. Tab is 9, newline is 10, and carriage return is 13.
What is extended ASCII?
Extended ASCII refers to 8-bit encodings that use values 128–255 for additional characters beyond the standard 128. There is no single 'extended ASCII' standard — ISO-8859-1 (Latin-1), Windows-1252, and others each define different characters for the 128–255 range. This ambiguity is why Unicode was created.
What is the difference between ASCII and Unicode?
ASCII covers 128 characters, all from the English alphabet and basic punctuation. Unicode covers 1.1 million code points representing every writing system, symbol, and emoji. UTF-8, the dominant encoding on the web, is the most common Unicode encoding — and it is fully backward compatible with ASCII for the first 128 characters.
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