Tool to convert ALT Codes. ALT-Codes are used to describe ALT key combination on the keyboard generating ASCII text or Unicode characters, especially on Windows.
ALT-Codes - dCode
Tag(s) : Substitution Cipher
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ALT-Codes
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Converting to ALT-codes
Answers to Questions (FAQ)
How to encrypt using ALT-Codes
Encryption with AltCodes (ALT = alternative) consists in replacing numbers (between 1 and 31) with their graphic equivalent ALT Code. Letters can be replaced by numbers (A=1, B=2, etc.) before encoding.
Example: DCODE corresponds to 4,3,15,4,5 that is encrypted ♦♥☼♦♣
The full alphabet is:
| 1 | ☺ | 2 | ☻ | 3 | ♥ | 4 | ♦ |
|---|---|---|---|---|---|---|---|
| 5 | ♣ | 6 | ♠ | 7 | • | 8 | ◘ |
| 9 | ○ | 10 | ◙ | 11 | ♂ | 12 | ♀ |
| 13 | ♪ | 14 | ♫ | 15 | ☼ | 16 | ► |
| 17 | ◄ | 18 | ↕ | 19 | ‼ | 20 | ¶ |
| 21 | § | 22 | ▬ | 23 | ↨ | 24 | ↑ |
| 25 | ↓ | 26 | → | 27 | ← | 28 | ∟ |
| 29 | ↔ | 30 | ▲ | 31 | ▼ | 255 | ⌂ |
Not to be confused with the functionality of operating systems that can use a key combination with ALT to write characters according to their ASCII or Unicode code. (In this case the numbers are greater than 32)
How to decrypt ALT-Codes?
Decryption consists in replacing coded-characters by their corresponding number. Between 1 and 26, it is possible to convert them to letters.
Example: ♦♥☼♦♣ for 4,3,15,4,5 that is DCODE (A=1, B=2, etc.)
How to find the ALT+ code of a symbol or a letter?
Where do these ALT characters come from?
These characters comes from ASCII code page 437 and 850 from IBM, reused in Windows as ALT-Code, it allows writing characters that are not on a keyboard.
Why is it limited to 31?
Numbers between 32 and 128 are the usual ASCII characters. dCode has a tool to convert ASCII codes.
How to (de)cipher other numbers?
Place cursor into a text area, hold the ALT key, type the code number with the keypad, release ALT key. It is possible to obtain any Unicode characters with this technique.
When ALT-Codes have been invented?
ASCII table is born in 1986, graphic characters were added shortly afterwards.
Source code
dCode retains ownership of the online "ALT-Codes" source code. Except explicit open source licence (indicated CC / Creative Commons / free), the "ALT-Codes" algorithm, the applet or snippet (converter, solver, encryption / decryption, encoding / decoding, ciphering / deciphering, translator), or the "ALT-Codes" functions (calculate, convert, solve, decrypt / encrypt, decipher / cipher, decode / encode, translate) written in any informatic language (Python, Java, PHP, C#, Javascript, Matlab, etc.) and all data download, script, copy-paste, or API access for "ALT-Codes" are not public, same for offline use on PC, tablet, iPhone or Android ! Remainder : dCode is free to use.
Need Help ?
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NB: for encrypted messages, test our automatic cipher identifier!
Questions / Comments
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