Generate random letters in uppercase, lowercase or mixed case, with an option to avoid repeats.
Calculations happen locally. We do not send your values to our server.
Only the unaccented English letters A to Z are used, 26 in one case and 52 in mixed case, so a single uppercase letter has a 3.85% chance of being any given letter.
Each position is selected with secure randomness. With unique mode on, no letter repeats within one result, which limits the count to 26 in one case or 52 in mixed case, where A and a count as different characters.
Random letters are not a password. For security use the Password Generator, which also offers numbers, symbols and much greater length. Letters are generated independently, so any sequence, including a real word, can occasionally appear by chance.
Pick uppercase, lowercase or mixed case and the number of letters. Only the unaccented English letters A to Z are used, 26 in one case and 52 in mixed case. Each position is selected with secure randomness, so a single uppercase letter has a 3.85% chance of being any given letter. Random letters are handy for word games, classroom activities, choosing a starting letter for categories games, labelling samples or creating practice sequences for handwriting and typing.
With unique mode on, no letter repeats within one result. That limits the count to 26 in one case or 52 in mixed case: 26 unique uppercase letters return the whole alphabet in random order, while 27 are rejected. Mixed case treats A and a as different characters, so 52 unique letters return every uppercase and lowercase letter once. Use unique mode when a sequence must contain distinct letters, for example assigning a different letter to each team.
With duplicates allowed, four uppercase letters can form 456,976 different codes. Repeated letters are common: in 5 random uppercase letters, at least one letter repeats about 33.56% of the time. Random letters are not a password; for security, use the Password Generator, which also offers numbers, symbols and much greater length. The letters are generated independently, so any sequence, including a real word, can occasionally appear by chance.
| Input | Result |
|---|---|
1 uppercase letter | 26 possible · 3.85% each |
4 uppercase letters | 456,976 possible codes |
26 uppercase · unique | all 26 letters once |
27 uppercase · unique | rejected (only 26) |
52 mixed case · unique | all 52 letters once |
5 uppercase · duplicates allowed | P(any repeat) 33.56% |
Word games, classroom activities, choosing a starting letter for categories games, labelling samples, and practice sequences for handwriting or typing. Unique mode suits cases where each letter must be distinct, such as assigning a different letter to each team.
Because there are only 26 letters in one case. Asking for 26 unique uppercase letters returns the whole alphabet in random order, while 27 is impossible. Mixed case doubles the pool: 52 unique letters return every uppercase and lowercase letter once.
More often than people expect. With duplicates allowed, four uppercase letters can form 456,976 different codes, yet in 5 random uppercase letters at least one letter repeats about 33.56% of the time. Turn on unique mode when repeats would spoil the result.
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