Free ASCII Code Converter
Quick Tips
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Convert between ASCII characters and their numeric codes.
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Examples
A
Decimal: 65, Hex: 41, Octal: 101, Binary: 01000001
a
Decimal: 97, Hex: 61, Octal: 141, Binary: 01100001
65
A
Hello
72 101 108 108 111
Why Use This Tool?
What problems does this solve?
Understanding ASCII codes is fundamental to programming and debugging. This tool quickly converts between characters and their numeric representations in multiple number systems.
Common use cases:
- Learning ASCII codes for programming education
- Debugging character-related issues in code
- Converting between character and numeric representations
- Understanding control characters like TAB and newline
- Working with protocols that use ASCII codes
Who benefits from this tool?
Programming students learning character encoding. Developers debugging text processing. System administrators analyzing logs and protocols. Anyone needing quick ASCII lookups.
Privacy first: All conversion happens locally in your browser. Your text never leaves your device.
Frequently Asked Questions
Space is ASCII 32 (hex 20). It is the first printable character. Codes 0-31 are control characters, 32 is space, and 33-126 are visible printable characters.
Add 32 to the ASCII code. Uppercase A is 65, lowercase a is 97 (65+32). This works because the ASCII table was designed with this 32-offset between cases.
ASCII defines 128 characters using 7 bits. Unicode defines over 143,000 characters. ASCII is a subset of Unicode - codes 0-127 are identical in both.
Codes 0-31 are control characters: NUL (0), TAB (9), LF/newline (10), CR (13), ESC (27), etc. They control devices and text formatting rather than representing visible symbols.
ASCII is the foundation of UTF-8 (codes 0-127 are identical). Understanding ASCII helps with text processing, protocol debugging, and character manipulation in any language.
Extended ASCII uses codes 128-255 (the 8th bit). There is no single standard - different systems (ISO-8859-1, Windows-1252) define this range differently. Use UTF-8 for modern applications.
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