ASCII (American Standard Code for Information Interchange) is a character encoding standard that assigns numeric values to characters. It uses 7 bits to represent 128 characters, including control characters (0-31, 127) and printable characters (32-126). ASCII is the foundation of modern character encodings like UTF-8.

How do I encode text to ASCII?

Select 'Text to ASCII' mode, enter your text, choose the output format (decimal, hexadecimal, binary, or octal), and select a separator style. The tool will convert each character to its ASCII code. Non-ASCII characters (code > 127) are automatically filtered out.

How do I decode ASCII to text?

Select 'ASCII to Text' mode, paste your ASCII codes, and choose the input format or use auto-detect. The tool supports decimal (72 101 108 108 111), hex (0x48 0x65 0x6C 0x6C 0x6F), binary (0b01001000 0b01100101), and octal formats.

What are control characters?

Control characters (0-31 and 127) are non-printable characters used for device control and data formatting. Common ones include: NUL (null), TAB (horizontal tab), LF (line feed/newline), CR (carriage return), and ESC (escape). They don't display as visible characters but control text formatting and device behavior.

What's the difference between ASCII and Unicode?

ASCII uses 7 bits for 128 characters, only covering basic English letters, digits, and symbols. Unicode is a universal character set supporting 143,000+ characters from all languages. UTF-8 is a Unicode encoding that's backward-compatible with ASCII (ASCII values 0-127 are identical in UTF-8). Modern systems use UTF-8, not pure ASCII.

Tools

Mode

Input Text

Output Format

Separator

ASCII Output

72 101 108 108 111

ASCII Converter — Encode, Decode & View ASCII Table

Free ASCII converter to encode text to ASCII codes (decimal, hex, binary, octal) and decode ASCII back to text. Includes interactive ASCII table reference with search and filtering. Supports bidirectional conversion and auto-detection. All data processed locally in your browser.

Features

✓Encode text to ASCII codes (decimal, hex, binary, octal)
✓Decode ASCII codes back to text
✓Auto-detect input format
✓Multiple separator options (space, comma, prefix)
✓Bidirectional conversion support
✓Complete ASCII table reference (0-127)
✓Search and filter ASCII characters
✓Click to copy any value
✓Support for control characters
✓All data processed locally in your browser

How to Use

1Convert mode: Enter text to encode to ASCII codes.
2Convert mode: Enter ASCII codes to decode to text.
3Select output format (decimal, hex, binary, octal).
4Choose separator style (space, comma, or prefix).
5View mode: Browse the complete ASCII table.

Frequently Asked Questions

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