Random Letter Generator
Generate cryptographically secure random letters instantly — up to 20 at once, with case options and an exclude-ambiguous mode. Free, 100% in your browser.
Skip I, L, O — they look like 1, l, 0 and are easy to misread
Quick Answer
A random letter generator picks one or more letters of the alphabet at random. Enter how many letters you need (1–20), choose uppercase, lowercase, or a mix, and click generate. Our tool uses your browser's cryptographic random number generator, so results are truly unpredictable — perfect for games, drawings, classroom activities, and password seeds. Copy the sequence with one click.
How It Works
Slide to choose how many letters you need — 1 to 20
Pick uppercase, lowercase, or mixed case; optionally exclude ambiguous letters
Click Generate Letters for a fresh crypto-random sequence
Copy or share the result with one click
Key Facts
- Generate 1 to 20 random letters at once
- Uppercase, lowercase, or mixed-case output
- Exclude ambiguous letters (I, L, O) that look like 1, l, and 0
- Uses crypto.getRandomValues — true cryptographic randomness, not Math.random
- One-click copy and native share support
- 100% client-side: works offline after load, nothing is sent to a server
- Free with no sign-up and no limits
Frequently Asked Questions
How does the random letter generator work?
It uses the browser's built-in crypto.getRandomValues API with rejection sampling to eliminate modulo bias, giving each of the 26 letters an exactly equal chance. You choose how many letters to draw (1–20) and the case style; results appear instantly.
Why exclude ambiguous letters?
The letters I, L, and O are easy to confuse with 1, lowercase l, and 0 when read aloud, typed, or copied. Excluding them is handy for verification codes, classroom handouts, and games where every letter must be unmistakable.
Can I generate lowercase or mixed-case letters?
Yes. Three case buttons let you choose ABC (all uppercase), abc (all lowercase), or ABc (each letter randomly upper- or lowercase). The mix mode is useful for creating random strings with varied casing.
Is it random enough for a fair drawing or raffle?
Yes. Unlike Math.random-based tools, this generator uses the Web Crypto API (crypto.getRandomValues), the same source browsers use for security tokens, so every letter has an equal 1-in-26 chance and sequences cannot be predicted.
Is this tool free and private?
Completely free with no sign-up, ads, or limits. Everything runs in your browser — your settings and results never leave your device, and the page keeps working offline once loaded.