Random numbers generator

THE PRACTICAL GUIDE · NORMANDIN SYSTEMS

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Random numbers generator: Generate random numbers (decimal, hexadecimal). With denied characters, you can generate other bases. This generator produces character-based numeric representations, which is useful for test data when length and allowed characters matter. Random identifiers and secret values require deliberate choices about length, allowed characters, and how the result will be used. An identifier can be unique enough for an application without being suitable as an authentication secret. Restrictions imposed by databases, URLs, forms, or human transcription can also affect the useful character set. Generate a small sample first to confirm compatibility, then consider collision handling and storage in the destination system. Example values in documentation are public and should never become real credentials or reusable access codes.

Guide updated October 13, 2026

How to use this tool

1. Begin with a representative input. For a practical test, use: Decimal characters, a chosen digit length, and a quantity. Replace demonstration values only after you understand the output.
2. Choose the available length, quantity, and character options to match the destination’s documented input requirements.
3. Generate a sample and inspect its characters, leading zeros, and separators before requesting or copying a larger set.
4. Use the result in the intended system with appropriate uniqueness checks or secret storage according to its purpose.

SEE IT IN PRACTICE

A worked example

Decimal characters, a chosen digit length, and a quantity

Random digit strings in the selected representation

Preserve leading zeros and distinguish string-generation settings from a minimum/maximum numeric range.

Identify the role before choosing the format

A database identifier, a one-time login code, and an API secret have different requirements. Public identifiers need appropriate uniqueness handling. Short authentication codes need strict attempt and lifetime controls. Long bearer secrets need protected storage and transport. A numeric-looking value may also require leading zeros, so its exact string representation can matter more than its arithmetic value.

Test destination constraints explicitly

Try the longest intended value and every enabled character class in the receiving form, URL, database, or configuration file. Check whether the destination trims spaces, changes case, or rejects punctuation. For generated batches, enforce uniqueness in the system that stores the values when duplicates would be harmful. Do not infer secure authorization merely from an identifier being unfamiliar or difficult to guess.

When this tool is useful

• Create numeric-looking test data
• Generate hexadecimal samples
• Test character restrictions

Tips for a better result

• A fixed-length digit string is not necessarily a uniformly sampled value from an arbitrary numeric interval.
• Treat generated secrets as credentials, and do not place them in screenshots, public examples, or shared diagnostic logs.
• Length and alphabet both affect the number of possible values; a short numeric code has far fewer possibilities than a long random string.

Frequently asked questions