Skip to main content

Random String Generator API

Generate a random string online with customizable options for length, character types, and spacing. This tool is perfect for developers and anyone needing quick random strings for testing, placeholders, or creative projects.

Select your desired length (up to 5,000 characters), choose whether to include letters, numbers, or both, and optionally add spaces. Click "Generate" and copy the result instantly. The tool calls a lightweight API on the Hrekov VPS, so generation is server-side and returns in milliseconds.

Use the Tool​

Customize & Generate

This app makes a real-time call to the Random String Generator API.

Generated String

This is where your generated string will appear.

Get notified about updates to this tool

No spam. Just high-quality updates about new features and guides.

What This Tool Does​

What the tool does​

A web UI and REST API that generates alphanumeric random strings up to 5,000 characters long. You control the character pool (letters A–Z a–z, digits 0–9) and whether spaces are interspersed. The result is returned from a server-side endpoint on the Hrekov VPS, meaning the randomness comes from the backend PRNG rather than Math.random().

What problems it solves​

Manually crafting test strings produces biased data - humans gravitate toward familiar patterns. Seeding a database, populating fixture files, generating placeholder tokens, or stress-testing a field's character-length validator all require disposable random text you don't want to type by hand. This tool generates it in one click.

Who should use it​

  • Backend developers seeding databases or writing unit tests that need fixture strings
  • QA engineers populating form fields to test input sanitization and length limits
  • Content creators needing random placeholder text for UI mockups (a character-set alternative to Lorem Ipsum)
  • Students exploring randomness and character encoding concepts

Why it matters​

The tool uses a server-side pseudo-random number generator (PRNG), not Math.random(), which is intentionally non-cryptographic in all major JavaScript engines. For test data and placeholders this is the right trade-off: fast, unpredictable, and stateless. If you need strings for secrets or authentication tokens, use the JWT Secret Key Generator or Strong Password Generator, which use cryptographic sources.

How It Works​

Input​

Specify the string length (1–5,000 characters), check the character sets to include (letters, numbers, or both), and toggle spaces on or off. At least one character type must be selected.

Processing​

Your settings are posted to the API endpoint on the Hrekov VPS. The server builds the allowed character pool from your selections, then samples it length times using the backend runtime's PRNG, constructing the string character-by-character. The result is returned as plain text and injected into the output field.

Limitations​

  • No special characters - the alphabet is strictly [A-Za-z0-9 ]. For passwords requiring symbols, use the Strong Password Generator.
  • 5,000-character cap - requests above this are rejected. Larger bulk data needs should hit the REST endpoint directly (see API docs below).
  • Not cryptographically secure - the backend PRNG is suitable for test data but must not be used for secrets, API keys, or session tokens.

Output​

The generated string appears in a read-only text field with a "Copy" button that writes the result to the clipboard via the Clipboard API.

Developer API Available
Need to run this programmatically? Get an API key.
Get API Key

Frequently Asked Questions​

Is the Random String Generator free to use?​

Yes, this online tool is completely free for personal and commercial use directly on this website.

What is the maximum string length I can generate?​

You can generate random strings with a length of up to 5,000 characters per request.

Can I include special characters (like !@#$%)?​

Currently, this tool supports Letters (A-Z, a-z) and Numbers (0-9). Special symbols are not supported in the standard interface to keep the output alphanumeric-friendly.

Can I use this to generate secure passwords?​

While the strings are random, for high-security passwords, it is generally recommended to use a dedicated password manager or a generator that includes special characters to increase entropy. However, for moderate security needs or temporary tokens, this tool works well.

Does the tool save the strings I generate?​

No. The strings are generated on-the-fly by our backend API and delivered to your browser. We do not store or log the specific strings you generate.

Why do I get an error when I uncheck both Letters and Numbers?​

The generator requires at least one character set to be active to function. You must select either Letters, Numbers, or both.

How do I use the API programmatically?​

We offer a developer API for integrating this functionality into your own apps. Please refer to the API Documentation for endpoints, authentication, and usage limits.

Can I generate multiple strings at once?​

The current web interface generates one string at a time. However, you can click the "Generate" button repeatedly to create new strings instantly.

Is the randomness truly random?​

The tool uses standard pseudo-random number generators provided by the backend programming language. This is sufficient for almost all non-cryptographic use cases (like IDs, test data, etc.).

Does it work on mobile devices?​

Yes! The tool is fully responsive and works on smartphones and tablets, allowing you to generate and copy strings on the go.

Get Early Access to New Tools

Be the first to try new APIs and applications. No noise. Only meaningful releases and practical engineering insights.

Last updated on