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Random number generator without repeats

Fair unique integers — perfect as a random number generator between 1 and 100 or any range. Fisher–Yates + Web Crypto, presets, CSV export, indexed table.

No duplicates1–100 readyCSV exportMobile + PC
Results appear here.

Random number generator without repeats — guide

A random number generator without repeats draws unique integers from a finite pool. The common case is a random number generator between 1 and 100 for classrooms, raffles and percent ranks. This pro tool shuffles with Web Crypto, shows an indexed table, and exports CSV for spreadsheets.

How it works

  1. Build all integers from min to max inclusive.
  2. Fisher–Yates shuffle using cryptographic randomness when available.
  3. Take the first N values as your unique sample.

Set bounds, choose count, generate, copy or download CSV. Mobile and PC share the same fair algorithm with no server upload.

Use cases