ASCII Text Converter
Convert text to ASCII codes
What Is This Tool?
The ASCII Text Converter converts text into its ASCII character codes and back again. Each character becomes a decimal number representing its position in the character encoding table, useful for learning how text is represented as numbers, debugging encoding issues, or simple puzzle/cipher work. Everything runs locally in your browser.
How to Use
Type or paste text into the Text field.
Click "Text to ASCII" to convert it into space-separated character codes.
Or paste codes into the ASCII Codes field and click "ASCII to Text" to convert back.
Use Swap to flip the two fields, or Copy to grab either result.
Features
- Convert text to ASCII codes and back in either direction
- Swap button to flip input/output
- Copy buttons for both text and codes
- Clear error messages for invalid code input
- 100% client-side — nothing leaves your browser
Examples
Text: Hello
ASCII Codes: 72 101 108 108 111
Common Use Cases
- Learning how characters map to numeric codes
- Debugging text encoding or byte-level issues
- Simple puzzle, CTF, or educational cipher exercises
- Quickly checking the character code of a specific letter or symbol
Frequently Asked Questions
Does this handle characters beyond standard ASCII (0-127)?
Yes, technically. Conversion uses each character's UTF-16 code unit value, so accented letters and many symbols above 127 will still convert, though they are not "ASCII" in the strict 7-bit sense.
What happens with emoji or characters outside the Basic Multilingual Plane?
Text to ASCII processes each UTF-16 code unit, so an emoji made of a surrogate pair will produce two codes instead of one. For full codepoint-aware conversion (including emoji as a single unit), use the Unicode Code Point Converter instead.
What format should the ASCII codes be in?
Decimal numbers separated by spaces, for example "72 101 108 108 111". Codes separated by other whitespace like tabs or newlines also work.
What happens if I enter an invalid code?
The tool shows a clear error message identifying the invalid token instead of silently producing garbled output.
Is my text sent anywhere?
No. All conversion happens locally in your browser using JavaScript. Nothing is uploaded or logged.
Can I convert codes back to text and get the exact original?
Yes, converting ASCII codes back to text using the same code list reproduces the original text exactly, as long as no surrogate pairs were split.