What is ASCII ↔ String conversion?

These conversions are useful when you want to convert between decimal byte values and a string representation, especially when dealing with escape sequences or needing a JSON-safe output.

This tool treats text as UTF-8 bytes for numeric formats (decimal/hex/binary/octal). Non-ASCII characters (like emoji) will convert to multiple bytes.

How it Works

• For String → ASCII: paste a string (optionally with escapes like \n).
• For ASCII → String: paste decimal byte values (0–255).
• Convert instantly and copy output.

All conversion runs locally in your browser for privacy.

Common Use Cases

When to use String → ASCII

• Turning escaped sequences (\n, \t) into numeric bytes
• Building test fixtures for parsers and protocol code
• Inspecting exactly which bytes are produced by a string

When to use ASCII → String

• Reconstructing readable text from decimal byte dumps
• Generating a JSON-escaped string for copy/paste into code
• Debugging invisible characters like newline or tab

Examples

Newline byte

• Input: \n
• Output: 10

Enable “interpret escapes” for this input.

Hello

• Input: Hello
• Output: 72 101 108 108 111

Emoji (UTF-8 bytes)

• Input: 👋
• Output: 240 159 145 139

Conversion Tips

Interpret escapes

If you type \n, \t, etc., enable “interpret escapes” so they become the intended characters before conversion.

JSON output

For ASCII → String, enable “Output as JSON string” to get a quoted + escaped string suitable for JavaScript/JSON.

Frequently Asked Questions

Quick Reference (common escapes)

• \n = newline (10)
• \t = tab (9)
• \r = carriage return (13)
• \\ = backslash (92)