How to use the ASCII Encoder
Get ASCII codes in seconds:
1
Paste your text
Enter any text — every character including spaces and punctuation will be encoded to its numeric code.
2
Choose base and separator
Select Decimal (standard ASCII tables), Hex (programming), Octal (Unix permissions), or Binary (computer science). Choose a separator to match your target format.
3
Copy the codes
Copy the complete list of numeric codes for use in your application, documentation, or learning exercise.
When to use this tool
Use this tool when you need the numeric code values of text characters:
- →Learning ASCII code values for characters when studying computer science fundamentals or preparing for coding interviews
- →Debugging binary protocols and network packets where you need to match byte values to characters
- →Generating decimal or hex character codes for use in C, Python, or Java character literal expressions
- →Verifying character encoding in text files by checking if code values match expected ASCII or Unicode ranges
- →Creating encoded data representations for educational materials, quizzes, or encoding puzzles
- →Checking for hidden or non-printable characters in text by examining their numeric code values
Frequently asked questions
Q:What is the difference between ASCII and Unicode code points?
ASCII (American Standard Code for Information Interchange) defines 128 characters (code points 0–127) including English letters, digits, punctuation, and control characters. Unicode extends this to over 1.1 million code points covering all the world's scripts, symbols, and emoji. The first 128 Unicode code points (U+0000 to U+007F) are identical to ASCII — so 'A' is 65 in both ASCII and Unicode. This tool encodes every character as its Unicode code point value, which matches ASCII for standard keyboard characters. Characters above 127 (like accented letters, CJK characters, or emoji) produce multi-digit code point values.
Q:Why does a space character encode to 32?
The space character (U+0020) has decimal code point 32 in the ASCII standard, which was finalized in 1963. The first 32 codes (0–31) are reserved for non-printable control characters like newline (10), carriage return (13), and tab (9). Space is the first printable character at code 32. In hex, space is 0x20; in binary, it's 00100000; in octal, it's 040. Understanding that space = 32 is a fundamental programming fact — it's why the blank line above lowercase letters in ASCII art uses character code 32.
Q:What do the different numeric bases mean for ASCII codes?
All four bases represent the same underlying code point value, just in different number systems. Decimal (base-10) uses digits 0–9 and is what we count with normally — 'A' = 65. Hexadecimal (base-16) uses 0–9 and A–F — 'A' = 41 (hex). Programmers prefer hex because each hex digit represents exactly 4 bits, making byte values easy to read. Octal (base-8) uses digits 0–7 — 'A' = 101 (octal), historically used in Unix systems. Binary (base-2) uses only 0 and 1 — 'A' = 01000001, showing the actual bit pattern stored in memory.
Q:How are non-ASCII characters like emoji encoded by this tool?
Characters outside ASCII (code points above 127) are encoded as their full Unicode code point values. For example, the euro sign € is U+20AC, so it encodes as 8364 (decimal), 20AC (hex), or 10000101001100 (binary). Emoji like 😀 have code points above 65535 — 😀 is U+1F600, encoding as 128512 (decimal) or 1F600 (hex). These are not multi-byte UTF-8 values but the Unicode scalar code point. If you need UTF-8 byte values instead of code points, use the Hex Encoder tool which encodes text as UTF-8 bytes.
Q:What is the ASCII code for common special characters?
Key ASCII codes to memorize: Space=32, 0–9=48–57, A–Z=65–90, a–z=97–122. Special characters: newline (LF)=10, tab=9, carriage return=13, exclamation=33, double quote=34, hash=#=35, ampersand=38, single quote=39, open paren=40, asterisk=42, plus=43, comma=44, period=46, forward slash=47, colon=58, semicolon=59, at symbol=64, open bracket=91, backslash=92, caret=94, underscore=95, pipe=124, tilde=126, DEL=127. The difference between uppercase A (65) and lowercase a (97) is always exactly 32 — the same as the space character, which is why you can toggle case by flipping bit 5.
Q:How do I check if a string contains only printable ASCII characters?
Using this tool, encode your text in decimal mode and check that every value falls between 32 (space) and 126 (tilde ~). Values 0–31 and 127 are non-printable control characters. Values 128 and above are extended ASCII or Unicode characters. If any code falls outside 32–126, the string contains non-printable or non-ASCII characters. In code: JavaScript: /^[\x20-\x7E]*$/.test(str), Python: all(32 <= ord(c) <= 126 for c in s), or equivalently str.isascii() && str.isprintable().