ASCII Converter — Free Online Tool
ASCII Conversion Results
What is ASCII Converter?
The ASCII Converter acts as a direct interface to the fundamental dictionary of modern computing, allowing you to manually translate plain English text into raw decimal integers (like '72 101'), and effortlessly decode those integers back into words. Long before the invention of Unicode, the ASCII standard mapped the numbers 0 through 127 to specific American keys and punctuation.
By converting text to ASCII, you expose this foundational mathematical architecture, a critical tool for low-level programming and cryptography.
When to use ASCII Converter?
Use this tool to construct or decode numeric cyphers for escape rooms, computer science exams, and ARGs. Database administrators frequently use it to diagnose legacy system errors where a database awkwardly outputs raw ASCII decimal values instead of rendering the characters on screen.
To convert the text string into literal machine base-2 calculation, run your output through the Text to Binary Converter instead.
How to use this tool
- 1Paste text or ASCII decimal values
- 2Choose 'Text to ASCII' or 'ASCII to Text'
- 3Copy the converted result
The tool works specifically with base-10 decimal numbers separated by spaces. Note that in ASCII math, capital letters yield completely different numeric values than lowercase letters.
Examples
| Input | Output |
|---|---|
| Hello | 72 101 108 108 111 |
| 72 101 108 108 111 | Hello (ASCII to text) |
| A | 65 |
| 65 66 67 | ABC |
| Space | 83 112 97 99 101 (the word 'Space') |
Rules & Behavior
- Text to ASCII converts characters into their base-10 decimal integer equivalent based exactly on the standard mapping (e.g., A = 65).
- ASCII to Text scans space-separated decimal numbers and reliably translates the mathematical payload back into the character it originally mapped to.
- Numbers exceeding the strict standard 127 will map to their appropriate Extended ASCII or UTF-16 characters.
Related Tools
Frequently Asked Questions
What is ASCII?
ASCII (American Standard Code for Information Interchange) is the original standardized master dictionary dictating how early computers interpret text. Because computers only process math, ASCII simply assigns a permanent numerical value to every letter (e.g., 'A' is 65). All standard keys live between 0 and 127.
Why is an uppercase letter a different number than a lowercase?
In computer systems, 'A' and 'a' are entirely different entities. Sorting and searching requires specific mapping. Uppercase letters occupy the numerical range 65-90. Lowercase letters occupy 97-122. If you format text with the Lowercase Converter first, the resulting ASCII numbers fundamentally change.
What number does the spacebar make in ASCII?
Invisible whitespace is completely vital for data structuring, so it requires its own unique numerical identity. The standard spacebar creates the exact ASCII number 32. In the output, you will distinctly see '32' separating words.
Why did I get weird symbols or blank spaces when decoding?
Values from 0 to 31 are known as 'Control Characters'. Historically, they sent mechanical hardware commands to printers, like 'Line Feed' or 'Bell'. Inputting numbers below 32 won't print letters; they will trigger invisible layout commands or generic error icons.
Is ASCII different from Unicode?
Yes, though deeply intertwined. ASCII is highly archaic, covering strictly basic English (0-127). Unicode is the modernized standard that possesses millions of numbers covering every human language and emoji. However, the first 127 numbers of Unicode perfectly match the old ASCII chart.