What Is the A1Z26 Cipher?
The A1Z26 cipher (also written A1Z26 cypher or A1-Z26) is a straightforward substitution cipher that replaces each letter of the English alphabet with its position number. The name itself encodes the rule: A = 1 (the first letter, the first number) and Z = 26 (the last letter, the last number).
Unlike transposition ciphers that rearrange letters, A1Z26 substitutes each letter for a number. Unlike more complex substitution ciphers with shifting keys (like the Caesar or Vigenère), A1Z26 uses a fixed, universally known mapping — making it ideal for puzzles where solvers are meant to crack the code with effort, not brute-force computing.
The core rule, in one line:
A=1, B=2, C=3 … M=13 … Z=26
Every letter maps to its ordinal position in the standard English alphabet. No exceptions, no shifts.
The Complete A1Z26 Chart (A=1 to Z=26)
This is the definitive A1Z26 cipher chart — the full A-Z 1-26 chart showing every letter and its corresponding number. Bookmark this page or copy the chart for quick reference.
Standard A1Z26 alphabet mapping. Uppercase and lowercase letters share the same values (a=A=1).
A1Z26 reference table — quick lookup
| Letter | A | B | C | D | E | F | G | H | I | J | K | L | M |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Value | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 |
| Letter | N | O | P | Q | R | S | T | U | V | W | X | Y | Z |
| Value | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 |
How to Encode with A1Z26
Encoding text with the A1Z26 cipher is a three-step process you can do entirely by hand using the chart above, or instantly with an A1Z26 encoder tool.
- Write out your message in capital letters. Remove spaces if you want the encoded output to have no gaps, or keep them as word separators.
- Look up each letter in the A1Z26 chart and replace it with the corresponding number.
- Separate numbers with a delimiter — a dash, space, or comma — so the decoder knows where each number ends. Without delimiters, 12 could be L (12) or A+B (1+2).
Example: Encoding "CIPHER"
C=3 · I=9 · P=16 · H=8 · E=5 · R=18
A1Z26 output: 3-9-16-8-5-18
For instant encoding of any word or phrase, use the A1Z26 Translator tool — paste your text and get the number sequence in one click.
How to Decode A1Z26 Numbers to Letters
Decoding — the reverse of encoding — converts a number sequence back to letters. This is what most people need when they encounter a string of numbers in a puzzle or clue. Here's how an A1Z26 decoder works, step by step:
- Identify the delimiter — are numbers separated by dashes, spaces, or commas? Split the sequence at that character to get individual numbers.
- Map each number to a letter using the A1Z26 chart: 1→A, 2→B … 26→Z. Any number outside 1–26 is not a standard A1Z26 value (could be a space, punctuation, or an error).
- Concatenate the letters to form the plaintext. Add spaces back between words if you know where they fall.
Example: Decoding "19-5-3-18-5-20"
19→S · 5→E · 3→C · 18→R · 5→E · 20→T
Decoded: SECRET
A1Z26 Cipher Examples
The table below shows common words encoded in A1Z26. Use it to verify your translations or as a quick reference when solving puzzles.
| Word | A1Z26 Encoded | Note |
|---|---|---|
| HELLO | 8-5-12-12-15 | The classic test word |
| SECRET | 19-5-3-18-5-20 | |
| PUZZLE | 16-21-26-26-12-5 | |
| CIPHER | 3-9-16-8-5-18 | |
| RIZE | 18-9-26-5 | Searched as "a1z26 cipher 18-9-26-5 rize" |
| LOVE | 12-15-22-5 | |
| CODE | 3-15-4-5 | |
| ATTITUDE | 1-20-20-9-20-21-4-5 | Letter values sum to 100 |
Famous A1Z26 Number Sequences Decoded
These are some of the most commonly searched A1Z26 number strings — decoded and explained.
8-5-12-12-15
HELLO
H(8) E(5) L(12) L(12) O(15) — the universal test word for any cipher translator.
13-5-13-15-18-25-8-20-13-12
MEMORYHHTML → MEMORYHТML
M(13) E(5) M(13) O(15) R(18) Y(25) H(8) T(20) M(13) L(12) — this sequence decodes to MEMORYHTML, a 10-character string often used to test A1Z26 translators in developer and puzzle communities.
18-9-26-5
RIZE
R(18) I(9) Z(26) E(5) — searched widely as "a1z26 cipher 18-9-26-5 rize". RIZE uses all four quadrants of the alphabet and is a clean test for any A1Z26 encoder or decoder.
8-5-12-16-0-13-5
HELP_ME (or HELP·ME)
H(8) E(5) L(12) P(16) [0 = space/separator] M(13) E(5). The 0 is not a standard A1Z26 value — in many puzzle implementations it represents a word space or punctuation mark.
1-20-20-9-20-21-4-5
ATTITUDE
A(1)+T(20)+T(20)+I(9)+T(20)+U(21)+D(4)+E(5) = 100. The word ATTITUDE is famous in the number cipher world because its A1Z26 letter values sum to exactly 100 — a fact shared widely in motivational posts and number puzzle communities.
Decode any sequence instantly
Paste any number string into our A1Z26 Translator and it decodes immediately — dashes, spaces, or commas all work as separators.
I Use This A1Z26 Translator For…
I've been running this tool for a while now, and I'm always curious about the range of things people actually use it for. Here's my honest breakdown:
Escape rooms
This is probably the single most common use. You're in a room, there's a combination lock, and on the wall is something like "18-15-19-5". You pull up the A1Z26 translator on your phone, paste it in, and get ROSE — which is the flower on the clue card you found earlier. Every time. I love watching people have that moment where the cipher clicks and the lock opens.
Geocaching mystery caches
Geocache setters love A1Z26 because it's beginner-accessible without being trivially obvious. I've used the translator dozens of times on D3–D5 mystery caches where coordinates are hidden behind a number cipher. The tool is fast enough to not break the flow of solving.
Sending silly encoded messages to friends
I use it to encode text that looks meaningless — like "9 12-15-22-5 25-15-21" — and send it to someone who knows the cipher. It's not secure, but it's fun, and the A1Z26 translator makes encoding fast enough that it doesn't kill the spontaneity.
Word value calculations
I use the sum of A1Z26 letter values to score words — for fun, for word game analysis, and for puzzle creation. ATTITUDE sums to 100, KNOWLEDGE to 96, HARDWORK to 98. There's a whole genre of viral posts around this. The A1Z26 encoder saves me from doing 8+ additions per word.
Checking puzzles before publishing
If I'm creating a puzzle that uses A1Z26 as a step, I use the translator to verify the encoded clue decodes correctly before I share it. One wrong digit in a long number sequence and the whole puzzle breaks.
Teaching kids basic cryptography
A1Z26 is the perfect intro cipher for kids and students. The math is simple addition (letter position), there's no key to remember, and the translation is satisfying and immediate. I've used it as a classroom activity to introduce the idea that text can be transformed into numbers — which is literally how computers store all text.
A1Z26 Cipher Letter Values — Full Mapping
The A1Z26 cipher letter values are the cornerstone of the system. Every letter has one fixed, unchanging value. Here's the complete A1Z26 cipher mapping with both directions (A→1 and 1→A):
| Letter | A1Z26 Value | Letter | A1Z26 Value |
|---|---|---|---|
| A | 1 | N | 14 |
| B | 2 | O | 15 |
| C | 3 | P | 16 |
| D | 4 | Q | 17 |
| E | 5 | R | 18 |
| F | 6 | S | 19 |
| G | 7 | T | 20 |
| H | 8 | U | 21 |
| I | 9 | V | 22 |
| J | 10 | W | 23 |
| K | 11 | X | 24 |
| L | 12 | Y | 25 |
| M | 13 | Z | 26 |
This is the full A1Z26 cipher alphabet positions A=1 Z=26 reference. The mapping is symmetric — each letter has exactly one number, and each number (1–26) maps back to exactly one letter.
A1Z26 vs A0Z25 — What's the Difference?
The two most common letter-to-number cipher systems differ by exactly one: where the count starts.
| System | A | M | Z | Common in |
|---|---|---|---|---|
| A1Z26 | 1 | 13 | 26 | Puzzles, escape rooms, geocaching, pop culture |
| A0Z25 | 0 | 12 | 25 | Programming (zero-indexed arrays), some cipher tools |
If you receive a sequence and the decoded result almost makes sense — like you get GDKKN instead of HELLO — try subtracting 1 from each value. That typically means the sender used A0Z25 while you're decoding with A1Z26. Our A0Z25 Cipher Translator handles the zero-indexed variant.
Mental Math Tips for Quick A1Z26 Translation
If you're in an escape room without your phone, these five anchor letters let you calculate any value without the full chart:
E=5 · J=10 · O=15 · T=20 · Y=25
These are the multiples-of-5 anchor letters. Every other letter is within 4 of one of these, so you never need to count from A.
With these five anchors memorised, you can mentally decode or encode any A1Z26 value in a few seconds — useful when you're standing in a room with a 4-digit combination lock and no phone signal.
Where A1Z26 Appears in the Wild
Escape rooms
The most common real-world use. A number lock requiring a 4-digit code is almost always paired with an A1Z26 clue somewhere in the room. The cipher is beloved by designers because participants can solve it with pen and paper — no special knowledge required beyond the alphabet.
Geocaching mystery caches
Mystery and puzzle cache coordinates are frequently hidden in A1Z26. A typical clue gives a sentence or phrase in number form; decoding it reveals the latitude or longitude digits. Our A1Z26 translator is specifically fast enough to use while standing in a field.
ARGs (Alternate Reality Games)
ARG creators use A1Z26 as an entry-level puzzle layer — accessible to new players, satisfying to solve, and easy to embed in images, audio, or website source code. Finding a string of numbers and recognizing it as A1Z26 is a classic ARG initiation.
Word value puzzles
The sum of a word's A1Z26 letter values is called its "word score" or "alphabetic value". ATTITUDE=100, HARDWORK=98, KNOWLEDGE=96. These numbers circulate widely in motivational posts, and people use an A1Z26 converter to verify or discover their own name's value.
Classroom cryptography
A1Z26 is the standard starting point for teaching cipher concepts to students. It requires no special symbols, the math is addition and subtraction, and the reveal is immediate — making it ideal for hands-on lessons about how encoding and decoding work.
Reddit puzzles and internet challenges
Reddit communities like r/puzzles, r/codes, and r/ARG regularly post number strings that decode to phrases in A1Z26. The cipher is also embedded in internet challenges, Discord server puzzles, and the hidden content of some online games.
A1Z26 in Other Languages (Tradutor, Traducteur…)
The A1Z26 cipher is based on the English alphabet positions A=1 to Z=26. Searches like a1z26 tradutor (Portuguese) and a1z26 traducteur(French) indicate users from many countries use this cipher — usually because the puzzles, escape rooms, and geocaches they're solving were designed in English.
A few important notes for non-English speakers:
- A1Z26 always uses the 26-letter English alphabet — accented characters (é, ã, ü, etc.) have no standard A1Z26 values and are typically ignored or represented as their base letter
- The numeric mapping (A=1, Z=26) does not change based on language — it is a fixed international standard for this cipher
- Our A1Z26 Translator tool interface works in any browser and requires no language-specific settings
If you're solving an A1Z26 puzzle in a language other than English and encounter letters outside A–Z, treat them as their nearest English equivalent or skip them — the puzzle designer almost certainly used standard A1Z26 based on the English alphabet.
Free A1Z26 Translator Tools
Encode or decode any text instantly with our free tools — no sign-up required.
- → A1Z26 Translator
Type text to encode it, or paste numbers to decode — both directions in one tool
- → A1Z26 Decoder and Encoder
Dedicated encoder/decoder with character-by-character breakdown
- → A0Z25 Cipher Translator
For zero-indexed A=0 to Z=25 encoding
Frequently Asked Questions
What is A1Z26?
A1Z26 is a simple substitution cipher where each English letter is replaced by its alphabet position number: A=1, B=2, C=3 … Z=26. The name spells out the first and last mappings. It is one of the most widely used ciphers in puzzles, escape rooms, and geocaching.
What is the full A1Z26 cipher chart?
A=1, B=2, C=3, D=4, E=5, F=6, G=7, H=8, I=9, J=10, K=11, L=12, M=13, N=14, O=15, P=16, Q=17, R=18, S=19, T=20, U=21, V=22, W=23, X=24, Y=25, Z=26. This is the complete A-Z 1-26 mapping.
What does 8 5 12 12 15 mean in A1Z26?
8-5-12-12-15 decodes to HELLO: H=8, E=5, L=12, L=12, O=15.
What does 13 5 13 15 18 25 8 20 13 12 mean?
13 5 13 15 18 25 8 20 13 12 decodes to MEMORYHТML using A1Z26: M(13) E(5) M(13) O(15) R(18) Y(25) H(8) T(20) M(13) L(12).
What does 18 9 26 5 decode to in A1Z26?
18-9-26-5 decodes to RIZE: R=18, I=9, Z=26, E=5.
What is the difference between A1Z26 and A0Z25?
A1Z26 starts at A=1 and ends at Z=26. A0Z25 starts at A=0 and ends at Z=25 — every letter value is one lower. A1Z26 is far more common in puzzles; A0Z25 is used in zero-indexed programming contexts.
Is A1Z26 the same as A1Z26 cypher?
Yes — "cipher" and "cypher" are spelling variants of the same word. "Cipher" is the modern standard spelling; "cypher" is an older British form. The technique is identical.
How do I use an A1Z26 translator online?
Go to letters2numbersconverter.com/tools/letter-number-converter, type or paste your text or numbers, and the tool converts instantly. It handles numbers separated by dashes, spaces, or commas automatically.