Big Random Number Generator
Generate extra-long random numbers with a fixed digit count. Every digit is produced as text, so a 50-digit result stays exact — no floating-point rounding.
Digits:
How Many:
Separator:
Generated Number
Download CSV
| Group | Digits | Generated Number |
|---|
Introduction to the tool and how to use it
Long Number Generator quickly creates random numbers with very many digits, commonly used for building test data, simulating card-number or account-number styles, and preparing sample input for big-number arithmetic.
Note: digits are generated character by character as strings, with no floating-point math, so even 50- or 100-digit numbers do not lose accuracy past 16 digits like ordinary calculations do. To keep the page responsive, one run caps at roughly 200,000 total characters; if you exceed it, the count is reduced automatically with a notice.
Note: digits are generated character by character as strings, with no floating-point math, so even 50- or 100-digit numbers do not lose accuracy past 16 digits like ordinary calculations do. To keep the page responsive, one run caps at roughly 200,000 total characters; if you exceed it, the count is reduced automatically with a notice.
How to use
- Set digits — how many digits each number has, for example 50.
- Set count — how many numbers to generate in one run.
- Check Allow leading zero when needed: unchecked, the first digit is chosen from 1-9 so results do not look short by a digit; checked, the first digit may be 0, letting you build numbers that start with 0.
- Check Keep unique when needed: once on, no two results repeat (when digit count is small and choices are limited, it deduplicates as far as possible).
- Set the separator — the default \\n means one per line; switch to a half-width comma to join everything onto one line.
- Click start; results go to both the text box and the table below (index / digits / number, copy in place), and the table can be downloaded as CSV.
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