Text to ASCII Code Converter – Decimal, Hex, Binary, C Escape & Control Characters

Convert text to ASCII codes and back: decimal, hex, binary, octal, U+xxxx, and C escape. Interactive ASCII table with control-character notes and character breakdown — useful next to CRC and UART debugging. Runs locally in your browser.

Text to ASCII Code Converter — Decimal, Hex, Binary, C Escape

Convert text to ASCII codes and back in decimal, hex, binary, octal, U+xxxx, and C escape — then use the interactive table for control characters. ASCII (American Standard Code for Information Interchange) is a 7-bit character encoding standard that represents text in computers and electronic devices. Developed in the 1960s, ASCII assigns unique numerical values (0-127) to letters, digits, punctuation marks, and control characters.

Each ASCII character occupies exactly one byte of memory, making it extremely efficient for text storage and transmission. The ASCII table includes:

  • Control characters (0-31): Non-printable characters like newline, tab, carriage return
  • Printable characters (32-126): Letters, numbers, punctuation, and symbols
  • Extended ASCII (128-255): Additional characters in some implementations

How This ASCII Converter Works

Our ASCII converter supports bidirectional conversion between text and ASCII codes with flexible input formats and comprehensive error handling. The tool provides multiple output modes: hexadecimal, decimal, binary, and octal representation.

Advanced Features:

  • Bidirectional Conversion: Convert text to ASCII codes and vice versa instantly
  • Quad Format Support: Choose between hexadecimal, decimal, binary, and octal representation
  • Customizable Output Styles: Select prefix styles for each format (0x vs x vs \x for hex, 0b vs b for binary, 0o vs o vs \ for octal)
  • Flexible Input Parsing: Support for various hex formats, space-separated decimals, and 8-bit binary strings
  • Real-time Error Feedback: Instant validation with detailed error messages and visual indicators
  • ASCII Table Viewer: Interactive reference table with Unicode (U+00XX), C escape notation, and control character descriptions
  • Character Breakdown: Per-character analysis with code point, hex, and control character notes
  • Unicode Notation: Input and output U+xxxx code points for ASCII range (0-255)
  • Extended ASCII Table: Optional ISO-8859-1 reference for codes 128-255
  • Smart Input Recognition: Automatically detect and parse mixed hex formats
  • Copy with Feedback: Click any output field to copy results with visual confirmation
  • Multiple Outputs: Add up to 10 different format outputs simultaneously

Supported Input Formats:

Hexadecimal formats supported:

  • 0x48 0x65 0x6C 0x6C 0x6F (standard prefix)
  • \x48\x65\x6C\x6C\x6F (escape sequence style)
  • x48x65x6Cx6Cx6F (x prefix only)
  • 48656C6C6F (raw hex, parsed in pairs)
  • 0x48 \x65 x6C 6F (mixed formats)

Decimal format:

  • 72 101 108 108 111 (space-separated numbers)
  • Valid range: 0-255 (Extended ASCII)

Binary format:

  • 0b01001000 0b01100101 (standard prefix)
  • b01001000 b01100101 (short prefix)
  • 01001000 01100101 01101100 01101100 01101111 (8-bit binary strings)
  • 0100100001100101011011000110110001101111 (continuous binary stream)

Octal format:

  • 0o110 0o145 0o154 (standard prefix)
  • o110 o145 o154 (short prefix)
  • 110 145 154 154 157 (3-digit octal numbers)
  • \110\145\154 (escape sequence style)

ASCII Table Reference

The complete 7-bit ASCII character set contains 128 characters (0-127). This interactive table shows each character with decimal, hexadecimal, binary, Unicode (U+00XX), C escape notation, and descriptions. Control characters (0-31) and DEL (127) are highlighted.

Understanding these character codes is essential for programming, data processing, and text manipulation. Each character has a unique code that computers use internally to represent text.

Professional Use Cases & Applications

1. Programming & Software Development

  • Debugging Character Issues: Inspect character data in applications to identify encoding problems and invisible characters
  • Protocol Implementation: Build communication protocols that transmit text as numerical data
  • Data Validation: Verify that input contains only valid ASCII characters for compatibility
  • Escape Sequence Processing: Create or parse escape sequences in strings and configuration files
  • Binary File Analysis: Extract readable text from binary files and data streams
  • Configuration File Parsing: Handle special characters in config files and command-line arguments

2. Cybersecurity & Forensics

  • Payload Analysis: Decode suspicious data in security investigations and incident response
  • Log Analysis: Convert encoded log entries to readable text for threat hunting
  • Malware Research: Analyze obfuscated strings in malicious code and reverse engineering
  • Network Traffic Inspection: Decode ASCII-encoded data in network packets and protocols
  • Digital Forensics: Extract text from corrupted or encoded files in forensic investigations
  • Steganography Detection: Analyze hidden messages in text-based steganographic techniques

3. Data Processing & Integration

  • File Format Analysis: Examine binary files containing ASCII text headers and metadata
  • Legacy System Integration: Work with older systems that use ASCII encoding for data exchange
  • Data Migration Projects: Convert text data between different encoding formats during system upgrades
  • Quality Assurance Testing: Verify text data integrity during transmission and storage
  • Database Import/Export: Handle special characters in CSV files and database dumps
  • API Development: Debug character encoding issues in REST APIs and web services

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Input Settings

Add Output

Input
Text Mode
Any text characters are supported; non-ASCII chars shown as UTF-8 bytes in code outputs
Hexadecimal Result
Click to copy
Debugging a UART frame or checksum next to these codes? Use the UART Calculator for baud and frame timing, or the CRC Calculator for checksums. Interpreting the same bytes as integers? Open the Number Base Converter.