Esports tournament seeding
An esports league uses secure mode with duplicate protection to randomize brackets, exporting CSV logs for auditors after every draw.
Random Number Generator
Generate secure, unbiased random numbers with flexible ranges, unique draws, and instant export options for any scenario.
Configure your random draw
Set the range, quantity, format, and randomness source that fit your task.
Allow duplicate numbers
Turn off to guarantee unique results. Larger ranges are required without duplicates.
Randomness source
Choose fast Math.random or secure cryptographic entropy.
Flexible minimum and maximum ranges with batch output
Unique results with optional no-repeat protection
Secure mode powered by the browser crypto API
Copy or download results as CSV or TXT in one click
Specialized generators and deep-dive guides
Explore focused workflows for lotteries, true randomness, gaming presets, and mobile-ready UIs.
Integer generator
Preset range recipes and fairness checklists for whole-number draws.
Lottery quick picks
Simulate Powerball, EuroMillions, or custom raffles with exportable batches.
True randomness mode
Understand Web Crypto entropy, fallbacks, and verification workflows.
Gaming & simulations
Dice replacements, loot table automation, and fair tournament seeding.
About & principles
Mission, architecture, and roadmap behind the RNG.
Mobile & app guide
Responsive layouts, offline tips, and embedding workflows for devices.
How the generator works
Every draw happens client-side for privacy: configure your parameters, pick the entropy source, and review the output instantly.
- 1
Set your range
Enter minimum and maximum values and decide how many results you need.
- 2
Choose randomness
Switch between fast Math.random or secure crypto entropy and toggle duplicate protection.
- 3
Generate and export
Generate numbers instantly, copy them, or download ready-to-use CSV/TXT files.
Popular ways to use this RNG
Designed around real user pain points from gamers, educators, analysts, and developers.
Game balancing & loot tables
Simulate rolls, randomize encounters, or draft tournament brackets with optional no-repeat fairness.
Classroom experiments
Generate unbiased samples for probability lessons, statistics labs, or mathematics demonstrations.
Data analysis & QA
Create reproducible test data, shuffle IDs, or choose participants while exporting logs for audits.
Case studies from real users
See how different teams rely on the generator to remove bias and document their workflows.
University research lab
A statistics department generates reproducible random assignments, storing the history pane output alongside experiment notes for compliance.
Product feature rollouts
A SaaS growth team randomly selects feature-flag cohorts and shares the TXT export with engineering to ensure transparent allocation.
Built for transparency and trust
Addressing the most common RNG complaints: bias, opacity, and limited control.
Cryptographic entropy
Secure mode uses the browser crypto API for high-quality randomness when available.
Repeatable settings
Every batch logs its parameters so you can prove how results were produced.
Fast at scale
Generate up to 1,000 numbers per batch in under a second on modern devices.
Client-side privacy
All calculations stay in your browser—no accounts, uploads, or data retention.
Random number generator FAQ
How do I guarantee there are no repeated numbers?
Disable the duplicate toggle. The tool checks that your quantity fits within the range or decimal precision and automatically retries until all results are unique.
What makes the secure mode more trustworthy?
Secure mode uses the Web Crypto API for cryptographically strong randomness sourced from the operating system. If a browser cannot supply secure entropy, the tool falls back to the standard generator and alerts you.
Can I download the results for documentation?
Yes. You can copy results to the clipboard or download ready-to-share CSV and TXT files, and the history panel stores the last 20 batches for quick re-exports.
How many numbers can I generate at once?
You can create up to 1,000 numbers per batch. Larger draws are best handled by exporting multiple batches so performance stays fast.
Can the generator output decimals or fractions?
Switch the format selector to decimals and choose how many decimal places you need. The generator rounds consistently so you can reuse the numbers in spreadsheets or simulations.
What does the history panel track?
The history log records the last 20 batches with their range, quantity, and entropy mode. It lets you audit results or repeat a draw without reconfiguring the tool.
What happens if secure randomness is unavailable?
The interface detects when the Web Crypto API cannot run, switches to the standard generator, and shows a warning banner. You can retry on a supported device or browser when security is critical.
Does the tool support mobile devices?
Yes. The layout is optimized for phones and tablets, and buttons like copy or download adjust to touch interactions, so you can run draws on the go.
How can I prove the draw was fair?
Keep the exported CSV or TXT along with the configuration shown in the history panel. Sharing both files gives reviewers the numbers, entropy mode, and timestamp for compliance checks.
Can I combine this RNG with true randomness sources?
The main generator supports secure browser entropy today, and the true random section explains how upcoming integrations with external hardware feeds will work. You can already import those results into the tool for record keeping.