AlphaCoderAlphaCoder
Free · No sign-up · Text conversion runs in your browser

Letters to Numbers Converter

Convert text to A1Z26, A0Z25, ASCII, binary and more—instantly, accurately and privately in your browser.

Client-side
A = 1, B = 2, … Z = 26
11 characters
Result Updated instantly
8-5-12-12-15 / 23-15-18-12-4
A=1 · B=2 · C=3 · View chart
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Browser-basedThe text you enter is converted on this device.

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No account neededOpen the tool and get a result immediately.

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Tested examplesEvery converter includes verifiable examples.

START WITH A TASK

What do you want to do?

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Turn letters into numbers

HELLO → 8-5-12-12-15Open converter →02

Turn numbers into letters

3-15-4-5 → CODEStart decoding →03

Solve a classic cipher

KHOOR → HELLOExplore ciphers →04

Print a secret-code puzzle

PDF · Answer key · A4Browse worksheets →
POPULAR CONVERTERS

More ways to encode and decode

Browse all tools →
Classic

A1Z26 Cipher

HELLO → 8-5-12-12-15
Decode

Numbers to Letters

3-15-4-5 → CODE
Shift

Caesar Cipher

HELLO +3 → KHOOR
Signal

Morse Translator

SOS → ··· ——— ···
Developer

Binary to Text

01000001 → A
Developer

ASCII Converter

ABC → 65 66 67
READY TO PRINT

Secret-code worksheets for curious minds

Real classroom-ready activities with answer keys. Print immediately or open the full worksheet.

Browse all worksheets →
WORKSHEET MAKER

Turn any message into a printable puzzle.

Choose a cipher, age and difficulty. AlphaCoder creates the worksheet, reference key and answer page for you.

✓ A4 & US Letter✓ PDF & PNG✓ Answer key
Browse ready-made worksheets →No sign-up · Free to print
Live preview
A475%
SECRET MESSAGE MISSIONNAME __________

Can you crack the code?

Use the A1Z26 key to decode each secret word.

119-5-3-18-5-20
23-15-4-5
313-9-19-19-9-15-14
A=1 · B=2 · C=3 · D=4 · E=5 · F=6 · … · Z=26
ALPHACODER.NETPAGE 1 OF 2
Answer key included ✓
LEARN BY DOING

Understand the code behind the code

View all guides →
GUIDE · 6 MIN

How A1Z26 turns letters into numbers

Learn the alphabet-position system with worked examples and a printable reference chart.

Read the guide →
CLASSROOM · 8 MIN

Secret-code activities for the classroom

Low-prep puzzle ideas that build spelling, pattern recognition and problem-solving skills.

Explore activities →
REFERENCE · 4 MIN

Escape room ciphers, explained

The number, symbol and shift codes you meet most often—and the fastest way to decode each.

Read the guide →
QUICK ANSWERS

Common questions

Everything you need before using the converter or printing a worksheet.

How does the letters-to-numbers converter work?＋

It maps each letter to its alphabet position. In A1Z26, A is 1, B is 2 and Z is 26. Choose Encode to turn text into numbers, or Decode to turn a number sequence back into letters.

Is the text I enter uploaded to a server?＋

No. The conversion runs entirely in your browser and the text you type is never sent to a server or to our analytics. The site is ad-supported and uses aggregate analytics, which never receive your conversion content.

Can I convert numbers back into letters?＋

Yes. Select Decode and paste a number sequence such as 8-5-12-12-15, using a slash (/) between words.

Are the worksheets free to print?＋

Yes. Every worksheet has a free printable PDF and a matching answer-key PDF, with no sign-up required.

Which cipher should beginners start with?＋

A1Z26 is the simplest starting point because each letter has one clear numeric value (A=1 … Z=26).