Random Number Generator - Generate Random Integers Decimals Online

Not all "random numbers" are truly random. In computing, randomness falls into three categories:

• Pseudo-Random (PRNG): Like JavaScript's Math.random(), generated by deterministic algorithms with predictable output. Not suitable for security-critical use.
• Cryptographically Secure (CSPRNG): Like the browser's crypto.getRandomValues(), based on OS-level entropy sources, providing cryptographic-grade unpredictability. This is what our tool uses.
• True Random (TRNG): From physical noise sources (radioactive decay, thermal noise), genuinely unpredictable but expensive and slow to obtain

For lotteries, sampling, test data, and most other scenarios, CSPRNG provides more than sufficient randomness while offering the best balance of performance and usability. Generate secure random numbers now →

Core Features:

• Integer / Decimal modes — Custom value ranges and precision (up to 10 decimal places)
• Range mode / Digit mode — Flexible generation rules
• Batch generation — Up to 1,000 random numbers at once
• Deduplication & sorting — Auto-remove duplicates, ascending/descending order
• Random Picker — Randomly select from a custom option list

Typical Use Cases:

• Lottery & raffles — Fair and transparent winner selection
• Data sampling — Random sample extraction from large datasets for analysis
• Test data generation — Batch populate databases or write unit tests
• Random grouping — Fair distribution in team-building or classroom activities

The tool also supports excluding specific numbers, custom separators, numbered prefixes, and history tracking. Try it now →

This random number generator uses a 100% frontend-only operation architecture. All number generation happens directly in your local browser.

Specific security guarantees:

• Randomness source is the browser-native crypto.getRandomValues() API (CSPRNG grade)
• Generated results are never uploaded to any server, transmitted over network, or logged
• All data vanishes immediately when page closes; no persistent storage
• No registration, login, or file uploads required

For highly auditable scenarios (such as official lottery drawings), we recommend screenshotting results as evidence and using multi-party witnessing for transparency.