Numbers to Letters Converter

Clue writers mark word breaks in different ways, so the separated mode accepts several and turns each one into a space in the answer:

• Slash or pipe: 6 9 14 4 / 20 8 5 / 11 5 25 → FIND THE KEY
• New line: one word per line, as on a worksheet
• Double space: 8 9 20 8 5 18 5 → HI THERE

Inside a word, single spaces, commas, dashes and dots all separate the numbers, so 3-15-4-5 and 3.15.4.5 both give CODE. If the clue has no word breaks at all, you'll get one long run of letters. Read it aloud and the words usually jump out: FINDTHEKEY is easier to split than it looks.

A clue full of numbers like 72 105 33 isn't A1Z26. It's probably ASCII, the character numbering computers have used since the 1960s and which Unicode keeps for its first 128 characters. Capitals start at 65 and lowercase at 97, exactly 32 apart, so 72 is H and 104 is h. Choose the ASCII numbering and 72 101 108 108 111 32 119 111 114 108 100 decodes to "Hello world".

Before smartphone keyboards, you typed a text by pressing each number key until the letter you wanted came up: 4 once for G, twice for H, three times for I. Puzzles still use this multi-tap code, written as groups of repeated digits. 44 33 555 555 666 is HELLO. Pressing past the last letter on a key cycles back to the first, and 0 gives a space.

The letters on each key follow the ITU-T E.161 standard: three per key except 7 (PQRS) and 9 (WXYZ). Older phones sometimes left Q and Z off, so a vintage puzzle might use a slightly different layout. Phone numbers written with words, like 1-800-FLOWERS, use the same layout in reverse with one press per letter. That can't be decoded uniquely, because 3 could be D, E or F.