Random number generator. Generate cryptographically secure random numbers with custom ranges, decimal/integer control, and bulk generation up to
100% browser-based — your data never leaves your device
Generate cryptographically secure random numbers with custom ranges and count.
Enter minimum and maximum values for the random numbers.
Set how many random numbers to generate (up to 1000).
Toggle decimals, unique-only mode, sort order, and separator format.
Click Generate or press Ctrl+Enter to generate random numbers.
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Random Number Generator is a free online math tool that generate cryptographically secure random numbers with custom ranges and count. It works entirely in your browser — no downloads, no installations, and no server uploads required. engineers, data scientists, students use Random Number Generator when they need a fast, privacy-respecting way to process math data without installing additional software. It supports capabilities such as custom range, bulk generation, decimal control. Additional features include copy all. Common use cases include generating random test data for software development and qa, picking random winners or selections for contests and giveaways, creating randomized samples for statistical analysis and simulations. All processing happens locally using modern browser APIs, which means your data never leaves your device. This makes Random Number Generator ideal for working with sensitive data, proprietary code, or any situation where privacy matters.
Random Number Generator is a free online math tool that helps you generate cryptographically secure random numbers with custom ranges and count. Key capabilities include custom range, bulk generation, decimal control. All processing is done locally in your browser — no data is uploaded, stored, or shared with any server. There are no sign-ups, no file size limits, and no hidden charges. It is commonly used to generating random test data for software development and qa.
Enter the minimum and maximum values for the random numbers you want to generate.
Select integer or decimal, set decimal precision if applicable, and choose how many numbers to generate (1-1000).
Click Generate to produce random numbers, then copy them as comma-separated or newline-separated.
| Category | Details |
|---|---|
| Input Limits | Numeric precision: 64-bit IEEE 754 (double) |
| Result precision: Up to 16 significant digits | |
| Supported Formats | Decimal, Hexadecimal, Binary, Octal, Scientific notation |
| Browser Engine |
|
All operations run entirely in your browser using built-in Math APIs. No server uploads, no data storage, and no third-party requests.
Random Number Generator is ideal when you need to generating random test data for software development and qa without installing software or uploading data to a server. Since everything runs in your browser, there is no setup time and no risk of your data being stored on external servers. For one-off tasks and quick processing, Random Number Generator is faster than setting up a local development environment or using a command-line tool.
No. Random Number Generator processes everything entirely in your browser using JavaScript. Nothing you type, paste, or upload is ever transmitted to any server. Your data never leaves your device.
Yes. The generator uses the Web Crypto API's crypto.getRandomValues() for cryptographically secure random number generation.
Yes. Toggle the decimal option to generate random numbers with a configurable number of decimal places.
Set minimum and maximum values for your random numbers.
Generate 1 to 1000 random numbers at once.
Toggle between integers and decimals with configurable precision.
Copy all generated numbers as comma-separated or newline-separated.
Random Number Generator is useful in a variety of scenarios across different workflows:
Generating random test data for software development and QA
Picking random winners or selections for contests and giveaways
Creating randomized samples for statistical analysis and simulations
Use the bulk generation feature to create up to 1000 random numbers at once. Copy them as comma-separated or newline-separated lists.
This tool uses crypto.getRandomValues() for true randomness suitable for security-sensitive applications.
Explore more tools in the Math workspace:
Unit Converter
Convert length, weight, temperature, area, and volume units.
Number Base Converter
Convert between binary, octal, decimal, and hexadecimal number systems.
Percentage Calculator
Calculate percentages easily with three common modes.
Chmod Calculator
Convert Unix file permissions between numeric and symbolic formats.
Scientific Calculator
Perform scientific calculations with trigonometric, logarithmic, and exponential functions.