How do I convert text into ASCII codes?

Set the Mode to Text to ASCII codes, then type or paste your text. Each character is replaced by its numeric ASCII code, separated by spaces, so Hi becomes 72 105 right away.

How do I turn ASCII codes back into text?

Switch the Mode to ASCII codes to text and enter your numbers separated by spaces. The tool reads each number as one character, so 72 105 turns into Hi as you type.

How should I separate the codes when decoding?

Put a single space between each code, for example 72 101 108 108 111. Each space-separated number is treated as one character code, which keeps the decoding clean and predictable.

Is my text sent to a server?

No. The conversion runs entirely in your browser, so the text you enter and the codes it produces never leave your device. It keeps working offline once the page has loaded.

Text to ASCII Code Converter

Input

Mode

Output

What the Text to ASCII Code converter does

This tool translates between plain text and ASCII character codes. In one mode it reads your text and prints the numeric ASCII code for every character, so Hi becomes 72 105. In the other mode it reads space-separated numbers and rebuilds the text, so 72 105 becomes Hi. It helps students learning how computers represent letters, developers checking output, and anyone working through a puzzle or a data format that uses raw character codes.

Each letter, digit, space, and symbol maps to one code, which makes it easy to see exactly what value sits behind any character.

How to use it

Choose a Mode from the dropdown: Text to ASCII codes, or ASCII codes to text.
Type or paste into the text box. For text, enter any words. For codes, enter numbers separated by single spaces, like 72 105.
Read the result as it appears. The tool runs instantly as you type, or you can press Convert.

When decoding, keep one space between each number so every value is read as a separate character.

A quick worked example

Type Hi in Text to ASCII codes mode and you get 72 105, because H is 72 and i is 105. Swap to ASCII codes to text, enter 72 105, and you get Hi back. A common gotcha is forgetting the space between codes, which merges two numbers into one wrong value.

It all happens in your browser, so your text stays private. The tool is free, needs no sign-up, and works the same on a laptop or phone.

Frequently asked questions

How do I convert text into ASCII codes?: Set the Mode to Text to ASCII codes, then type or paste your text. Each character is replaced by its numeric ASCII code, separated by spaces, so Hi becomes 72 105 right away.
How do I turn ASCII codes back into text?: Switch the Mode to ASCII codes to text and enter your numbers separated by spaces. The tool reads each number as one character, so 72 105 turns into Hi as you type.
How should I separate the codes when decoding?: Put a single space between each code, for example 72 101 108 108 111. Each space-separated number is treated as one character code, which keeps the decoding clean and predictable.
Is my text sent to a server?: No. The conversion runs entirely in your browser, so the text you enter and the codes it produces never leave your device. It keeps working offline once the page has loaded.

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Last updated: June 17, 2026