Random number generator

Random number generator is a free tool that returns one number from a range defined by the minimum and maximum values you enter.

What does a random number generator actually do?

A random number generator selects a number from within stated boundaries. A particular output cannot be specified as the guaranteed result of an example.

Most software-based random generators produce pseudo-random values. These come from a computational process rather than a physical source such as radioactive decay. An appropriately implemented pseudo-random generator is suitable for ordinary draws, games, test data and choosing between options, provided the outcome does not protect money, accounts or confidential information.

This tool does not state that it uses a cryptographically secure random source. Do not use its results for encryption keys, password-reset tokens, authentication codes or other security-sensitive values.

How do I use this random number generator?

Enter the lower boundary in Minimum and the upper boundary in Maximum, then generate the result shown in Number. Choose the boundaries before running a draw and keep them unchanged if several people or items are being treated under the same rules.

The result contains one number. If you need several winners or choices, generate separate results and decide beforehand whether repeated numbers are permitted. For a draw without replacement, record each selected number and exclude it from later rounds using a spreadsheet or another suitable process.

Privacy and security boundaries

The generation happens on the server. Your minimum and maximum values travel to the server over HTTPS and are not stored. The work does not remain entirely on your device.

Range boundaries are rarely sensitive, but they can reveal internal numbering schemes if copied from live systems. Use neutral ranges when possible rather than account numbers, case references or other operational identifiers.

A random number is also different from a purpose-built credential. If you need a login secret, use a Password generator and save the result in a password manager rather than a notes file. For software identifiers, a UUID v4 generator creates identifiers in the expected UUID format and is a better fit than an arbitrary number.

What can I use random numbers for?

You can use random numbers for casual selections, games, classroom exercises, mock data and low-stakes draws. The range should map clearly to the choices involved so that someone else can understand how the outcome was obtained.

Typical uses include selecting a board-game starting player, assigning one of several test scenarios, choosing a meal from a numbered list or drawing a prize from entries that already have unique numbers. Random values are also useful in software testing when developers need varied numerical inputs rather than the same fixed values in every test.

This tool should not be treated as evidence that a regulated or high-value draw was independently fair. Such draws may require documented procedures, witnesses, specialist software or an auditable source of randomness. A server-generated result shown on screen does not by itself provide that record.

How should I handle ranges and awkward input?

Use plain numerical boundaries and check that the minimum is lower than or equal to the maximum. The accepted numeric formats are not documented. Number the original items first and enter only those numbers.

The documented fields do not specify whether decimal values are accepted, whether both endpoints are included, or how empty and reversed ranges are validated. They also do not document limits for extremely large numbers. If endpoint treatment affects the result, do not rely on the tool without confirmed documentation of that behaviour.

Be careful when copying values from spreadsheets. Thousands separators and decimal punctuation vary by locale. In the UK, 1,500 normally means one thousand five hundred and 1.5 means one and a half, but an input field may expect an unformatted value such as 1500. Remove currency symbols, units and surrounding words before entry.

Frequently asked questions

Can the same random number appear more than once?

Yes, repeated random selections can produce the same value again unless the system explicitly samples without replacement. This tool returns one number and does not document a history or duplicate-prevention rule. Keep your own record when every selection must be unique.

Can I generate a negative random number?

A numerical range can mathematically include negative values, such as -10 to -1. However, the supplied tool information does not confirm how negative boundaries are validated. Check the result before relying on negative ranges in a workflow.

Are decimal random numbers supported?

Decimal support and precision are not documented for this tool. If you need values to a fixed number of decimal places, a spreadsheet function can generate and round them under an explicit formula. Record the rounding rule because it can affect how outcomes are distributed.

Can I use the result for a raffle?

It can be used for an informal, low-stakes raffle when every entry has a unique number and the rules are agreed beforehand. For a public, paid or regulated promotion, check the applicable UK rules and use a process that creates the required audit trail. Keep a record of the entry list, range, time and selected result.

Is a random number safe to use as a password or API key?

No. The tool does not provide a cryptographic-security guarantee, and a short numerical range has too few possible outcomes for a secure secret. Use a dedicated cryptographic generator for API keys and a Password generator for login credentials.

Final checks

• Confirm that every option has exactly one number.
• Check the minimum and maximum before generating the result.
• Decide whether endpoints and duplicate results matter to your task.
• Record the tool's Minimum, Maximum and returned Number if the selection needs to be explained later.
• Use a security-specific or audited system when the result controls access, money or a regulated decision.