ASCII Table Reference
Free interactive ASCII table reference. Look up the decimal, hexadecimal, octal, and binary code of all 128 standard ASCII characters plus an optional 128-character extended range. Instant search and one-click copy, 100% in-browser.
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What is ASCII Table Reference?
The ASCII Table Reference is an interactive lookup for the American Standard Code for Information Interchange. It shows the decimal, hexadecimal, octal, and binary code of every character in the 0-127 standard range and, optionally, the 128-255 extended range used by Latin-1 and code page 437. Search filters by code, character, or control-character mnemonic, and each row can be copied as tab-separated values. The whole table runs in the browser, so nothing is uploaded.
Key Benefits
- Four numeric bases - decimal, hex, octal, binary - shown side by side
- Instant search across codes, characters, and control mnemonics
- One-click row copy as tab-separated values for spreadsheets
- Standard and extended ranges cover ANSI X3.4 and Latin-1
- Works offline in a static export with no server round-trip
Common Use Cases
- •Looking up the hex or binary code of a character while coding
- •Identifying control characters in serial or terminal output
- •Cross-checking byte values when debugging encoding bugs
- •Teaching character encoding and number bases in class
- •Copying ASCII codes into documentation and cheat sheets
How to Use the ASCII Table
- Pick a range: Choose Standard (0-127) for ANSI X3.4 ASCII, or Extended (0-255) to include the Latin-1 / code page 437 characters.
- Search or browse: Type a decimal number, hex value, octal value, binary string, character, or control-character name into the search box to filter instantly.
- Read the row: Each row shows the decimal, hex, octal, and binary code next to the printable character (or a dot for control characters) and its mnemonic name.
- Copy a row: Click the copy icon on any row to copy all four codes plus the character as tab-separated values, ready to paste into a spreadsheet or notes.
Key Features
- Full ASCII table: all 128 standard characters (0-127) plus an optional 128-character extended range (128-255).
- Four numeric bases shown side by side: decimal, hexadecimal, octal, and binary.
- Live search filters by code, character, or control-character mnemonic as you type.
- One-click copy exports each row as clean tab-separated values for spreadsheets.
- Control characters are labelled with their mnemonic - NUL, LF, ESC, DEL and more.
- Runs entirely in the browser with no server round-trip, so it works offline in a static export.