How is the randomness generated?

All letters are drawn using the browser's crypto.getRandomValues() API with rejection sampling to remove modulo bias. This provides cryptographic-quality randomness, not the weaker Math.random().

Can I generate only vowels or only consonants?

Yes. Use the Vowels and Consonants toggles independently. You can enable both (all 26 letters), only vowels (A E I O U), only consonants (21 letters), or neither — though at least one group must be enabled.

What does the Exclude field do?

Type any letters you want removed from the pool. For example, entering "QXZ" removes those three letters from all picks. The field is case-insensitive.

What separators are available?

Space, comma, newline, or none (letters run together). The separator only affects how results are displayed and copied.

What does the frequency chart show?

After each generation, a bar chart lists every letter that appeared at least once and how many times. Bars are scaled relative to the most-frequent letter in the current batch.

Random Letter Generator

Name: Random Letter Generator
Availability: InStock
Author: Nham Vu

Generate 1-100 random letters with configurable case, vowel/consonant filters, separator, and exclusion list. Displays a live frequency chart.

Options

Number of letters (1–100)

Case

Include letters

Vowels (A E I O U) Consonants

Separator

Exclude letters (optional, case-insensitive)

Pool: A B C D E F G H I J K L M N O P Q R S T U V W X Y Z (26 letters)

Result

Click Generate to produce random letters.

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Summary

Generate 1-100 random letters with configurable case, vowel/consonant filters, separator, and exclusion list. Displays a live frequency chart.

How it works

The tool builds an alphabet pool from your selected options (vowels, consonants, or both), removes any excluded letters, then draws from that pool using rejection sampling over crypto.getRandomValues() to eliminate modulo bias. Results are joined with your chosen separator and displayed alongside a mini bar chart of letter frequencies.

Use cases

Generate random letter sequences for word games, Scrabble practice, or classroom phonics drills.
Create unbiased random letter sets for cryptography exercises or coding challenges.
Pick random starting letters for creative writing prompts.
Generate controlled random letter distributions to study probability and statistics.
Produce random consonant or vowel sequences for linguistics research or language learning games.

Frequently Asked Questions

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Last updated: 2026-05-28 · Reviewed by Nham Vu