ASCII Converter

About Ascii converter

Shows the decimal character code of every letter in your text, and turns a list of codes back into text. Codes are written in base 10 and separated by spaces, the form used in ASCII tables, programming exercises and many puzzle ciphers.

How to use it

1. On the Text to ASCII tab, type or paste your text into the Text box.
2. Press Convert to ASCII and read the numbers in the ASCII Result box, or use the copy icon.
3. To decode, switch to ASCII to Text and enter numbers in the ASCII Values (space-separated) box.
4. Press Convert to Text and read the message in the Text Result box.

A five-letter word

Hello

72 101 108 108 111

When to use it

• Solving a substitution puzzle where each letter has been replaced by its number.
• Checking which control character sits behind an invisible symbol in a data file.
• Preparing test input for a programming exercise about character codes.
• Confirming that a lowercase letter is exactly 32 above its uppercase partner.

Questions about Ascii converter

Is a value above 127 still ASCII?

Strictly no, because ASCII stops at 127. This tool reports the underlying code for every character, so the euro sign gives 8364 and an emoji produces two numbers such as 55357 56832.

Can I decode those two emoji numbers back?

Yes. Enter them in the same order and the pair rejoins into the emoji, because each number is written as a separate UTF-16 unit.

What separates the numbers on input?

Any whitespace. Entries that are not numbers are skipped without an error, so a typo can silently drop a character from the result.

What happens with negative or very large numbers?

Codes wrap around at 65536. For instance 65601 comes back as the letter A, and -1 comes back as an unprintable character.

Which codes are printable?

Codes 32 through 126 are the visible letters, digits and punctuation. Codes 0 to 31 are control characters, so 10 produces a line break and 9 a tab.

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