The ASCII & Unicode Converter bridges the gap between human-readable characters and their numeric representations. Every character displayed on screen — from the letter "A" to complex emoji — has a corresponding numeric code in the ASCII or Unicode standard. This tool lets you enter any character to instantly see its decimal, hexadecimal, and Unicode code point values, or enter a numeric code to reveal the character it represents. It is invaluable for developers debugging encoding issues, writers working with special characters, and students learning about character encoding. All conversion runs client-side in your browser, ensuring your input is never sent to any server.
About ASCII / Unicode Converter
ASCII (American Standard Code for Information Interchange) defines 128 characters using codes 0–127, covering basic Latin letters, digits, and control characters. Unicode extends this to over 149,000 characters across virtually every writing system, including emoji, mathematical symbols, and historic scripts. This tool converts in both directions: type a character to see its decimal value, hexadecimal value, and Unicode notation (U+XXXX), or enter any of these code formats to see the corresponding character. It is particularly useful when working with escape sequences in programming languages, debugging character encoding problems in APIs, or creating documentation that references specific code points.
How to Use ASCII / Unicode Converter
- Character → Code: Type or paste a character in the first field. The tool instantly displays its decimal, hexadecimal, and Unicode code point.
- Code → Character: Enter a decimal number (e.g., 65), hex value (e.g., 0x41), or Unicode notation (e.g., U+0041) in the second field.
- The corresponding character is displayed immediately. Copy any value you need for use in your code or documentation.
Key Features
- Bidirectional conversion between characters and numeric codes
- Supports decimal, hexadecimal, and Unicode (U+XXXX) notation
- Works with the full Unicode range, including emoji and non-Latin scripts
- Instant results with no page reload — updates as you type
- Completely browser-based with no server communication for full privacy
When to Use This Tool
- Debugging character encoding issues in APIs, databases, or file parsing
- Looking up escape sequences for special characters in JavaScript, Python, or HTML
- Creating documentation that references specific Unicode code points
- Learning how ASCII and Unicode standards map characters to numbers
- Complementing the Text to Binary converter for deeper encoding exploration
Technical Details
The tool uses JavaScript's String.prototype.codePointAt() to extract the Unicode code point of the first character in your input, then formats it as decimal, hexadecimal (prefixed with 0x), and Unicode notation (U+ followed by at least four hex digits). For the reverse direction, it parses decimal integers, 0x-prefixed hex values, and U+-prefixed notation, then uses String.fromCodePoint() to produce the character. This approach correctly handles characters outside the Basic Multilingual Plane (BMP), including emoji and rare scripts that require surrogate pairs in UTF-16.
Conclusion
The ASCII & Unicode Converter is an essential developer tool for quickly translating between characters and their numeric codes. Supporting the full Unicode range and multiple notation formats, it streamlines encoding tasks, debugging, and documentation — all within the privacy of your browser.