ASCII Encoder converts text into decimal ASCII codes — the numbers that represent each character in the ASCII table. For example, "Hello" becomes "72 101 108 108 111". Use it to understand how text is represented as numbers in computers, debug hardware serial communication, or convert strings for use in C, C++, or Assembly code.
ASCII (American Standard Code for Information Interchange) assigns each character a number from 0 to 127. The encoder uses JavaScript's charCodeAt() method on each character to get its Unicode code point, which for standard ASCII characters is the same as the ASCII code. The decimal numbers are output separated by spaces so each character's code is clearly distinct.
Standard ASCII only covers code points 0–127. Emoji and non-Latin characters have Unicode code points above 127. The tool outputs the Unicode code point as a decimal number, which for non-ASCII characters will be larger than 127. For true ASCII encoding, you should only input standard Latin letters, digits, and common punctuation.
This tool outputs base-10 decimal numbers. For hexadecimal output (like 48 65 6C 6C 6F for "Hello"), use the Text to Hex tool. For binary output (like 01001000 01100101...), use the Binary Encoder.
In the ASCII table, uppercase A is 65 and lowercase a is 97. Every uppercase letter has a decimal value exactly 32 lower than its lowercase equivalent. This 32-bit offset is used in programming for fast case conversion with bitwise operations.
Space is ASCII code 32, newline (line feed) is 10, and carriage return is 13. These appear as numbers in the output just like any other character. If you see a 10 or 13 in the output, there is a line break in your input.
No. The encoding runs entirely in your browser using charCodeAt(). Your text never leaves your device.
Tool workspace
Free ASCII Encoder online — instantly convert letters, text, and sentences into raw numeric ASCII decimal codes. Useful for cryptography, hardware programming, and debugging. No login.
Output
Input
Hello
Output
72 101 108 108 111
