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Convert numbers to letters in various formats. Numbering the letters so A=1, B=2, etc is one of the simplest ways of converting them to numbers. This is called the A1Z26 cipher. However, there are more options such as ASCII codes, tap codes or even the periodic table of elements to decode numbers.
Standard (A1Z26)
Each letter is represented by its position in the alphabet: A = 1, B = 2, ..., Z = 26. This method is known as the A1Z26 cipher. Uppercase and lowercase letters are treated the same.
A1Z26 translation
Zero-based (A0Z25)
A variation of the standard cipher where counting begins at zero: A = 0, B = 1, ..., Z = 25. This is often referred to as the A0Z25 cipher. Like A1Z26, it does not distinguish between uppercase and lowercase.
A0Z25 translation
ASCII
Converts each character to its corresponding ASCII (American Standard Code for Information Interchange) value. This includes not only letters, but also digits, punctuation, and whitespace. ASCII codes are case-sensitive. For a complete list of ASCII codes see here.
ASCII translation
Hex ASCII
Similar to standard ASCII, but each character is represented by its ASCII value in hexadecimal format (base 16). For example, 'A' becomes 41 and 'a' becomes 61.
Hex ASCII translation
Binary ASCII
Each character is translated to its ASCII value in binary format (base 2). For instance, 'A' becomes 01000001. Useful for visualizing or encoding text at the bit level.
Binary ASCII translation
Periodic Table
Each number corresponds to a chemical element’s atomic number: 1 = H (Hydrogen), 2 = He (Helium), and so on. This encoding method uses element symbols in place of standard letters.
Periodic Table of Elements
Letter numbers are used frequently in geocaching mystery caches (puzzle caches), CTFs and puzzle games.
See also: Code-Breaking tools | A1z26 | Ascii table | Barcode | Base64 decoder | Base64 encoder | Baudot code | Book cipher | Geek code | Letters to numbers | Pixel values extractor | Qr codes | Unicode | Utf-8 decoder | Utf-8 encoder