About ASCII Table Reference

Browse the full ASCII table with decimal, hex, and character values. Part of the DevTools Surf developer suite. Browse more tools in the Fun / Niche collection.

Use Cases

• Look up hex codes for embedded system programming
• Reference control characters when debugging serial protocols
• Find decimal values for ASCII art generation scripts
• Teach students character encoding fundamentals interactively

Tips

• Search by character, decimal value, or hex code
• Filter to show only printable or control characters
• Copy any character's hex or decimal value with one click

Fun Facts

• ASCII was published as a standard (ASA X3.4) in 1963 and defines exactly 128 characters, of which 33 are non-printable control codes.
• The ASCII code for 'A' is 65 (0x41), and the difference between uppercase and lowercase letters is exactly 32, enabling case conversion with a single bit flip.
• The DELETE character (127/0x7F) was assigned the highest code so that it could be punched as all-holes on paper tape, effectively erasing any character.

FAQ

Full 128 or extended 256?

Standard ASCII (0-127) by default. Toggle to show Extended ASCII (128-255) or Latin-1 Supplement for reference.

Does it show control characters?

Yes — NUL, SOH, BEL, BS, HT, LF, CR, and others with their meaning. Useful for decoding file headers and low-level protocols.

Decimal, hex, octal, binary?

All four columns shown. Click any row to copy any representation. Plus the printable character itself where applicable.

HTML entity for each character?

Yes — the numeric HTML entity (`A` for A) is shown so you can embed any ASCII char in HTML without worrying about encoding.