Random String Generator

Overview

What is a Random String Generator?

Random String Generator creates random strings or tokens of any length, over a character set you choose — lowercase, uppercase, digits, symbols, or custom. It uses a secure random generator, can produce many at once, and runs entirely in your browser, so the strings are never uploaded.

Developers constantly need random strings: test data, tokens, IDs, slugs, sample keys. This tool generates them to your exact spec — set the length, pick the character set, and choose how many — using a secure random source so the values are genuinely unpredictable.

It runs entirely in your browser, so even sensitive tokens stay on your device. Configure the charset, generate, and copy or download the results.

Guide

How to generate a random string

Step 1: Set the length and how many strings you want

Set the length and how many strings you want.

Step 2: Choose the character set — lowercase, uppercase, digits, symbols, or a custom set — and optionally exclude ambiguous characters

Choose the character set — lowercase, uppercase, digits, symbols, or a custom set — and optionally exclude ambiguous characters.

Step 3: Generate, then copy each, copy all, or download the list

Generate, then copy each, copy all, or download the list.

Screens

Random String Generator in action

Random strings generated over a chosen character set. — Charset + output

Batch of random strings with copy all. — Batch + copy all

Generating random strings on a phone, no app installed. — Mobile (stacked)

Details

Configurable, secure, and local

A good random string tool lets you match an exact format and trust the randomness. Toggle character sets to fit your needs — alphanumeric for IDs, a URL-safe set for slugs, symbols for stronger tokens — and exclude ambiguous characters (O/0, l/1) when the string might be read by a human. The generator uses your browser's cryptographically secure RNG, so the output is unpredictable, and everything runs locally, so nothing is transmitted or stored. One honest note: these are excellent for test data, tokens, and IDs, but if you're generating production cryptographic keys or secrets governed by a standard, follow your platform's official key-generation guidance. For human passwords and passphrases, use the Password Generator; for numeric PINs, the Random PIN Generator.

Support

Frequently Asked Questions

How do I control the characters used?

Toggle the character sets — lowercase, uppercase, digits, and symbols — or supply a custom set, and the strings are built only from what you allow. You can also exclude ambiguous characters like O and 0. This lets you match an exact format, such as alphanumeric IDs or a URL-safe slug.

Is the randomness secure?

Yes. The generator uses your browser's cryptographically secure random number generator (crypto.getRandomValues), so the strings are genuinely unpredictable rather than guessable. That makes them suitable for tokens and IDs, not just visually 'random-looking' output.

Can I generate many strings at once?

Yes. Set the count to produce a batch in one go, then copy them all or download the list. That's useful for seeding a database with IDs, creating test fixtures, or pre-generating tokens — all done locally in your browser.

How is this different from the Password Generator?

This tool produces raw random strings over any character set, aimed at developers (tokens, IDs, test data). The Password Generator is tuned for human-usable passwords and passphrases with strength/entropy guidance. Use this for machine strings, and the Password Generator for credentials people will type.

Can I use these as production secret keys?

They're great for test data, tokens, and IDs. For production cryptographic keys or secrets governed by a specific standard, follow your platform's official key-generation guidance rather than copying a generic random string — even though the RNG here is secure, formal key material often has format and length requirements.

Are the strings uploaded or stored?

No. Generation runs entirely in your browser, so the strings are created locally and never uploaded. Nothing is stored once you close the tab, so you can safely generate tokens and IDs without them being logged or transmitted anywhere.

Is it private — is anything uploaded?

No. Everything runs in your browser, so whatever you enter is processed on your own device and never uploaded. Nothing is stored once you close the tab unless you choose to save it. That keeps your lists, names, and data private.

Is it free, and do I need to sign up?

Yes, it's completely free with no account, no trial, and no limit on how many times you use it. Because it runs entirely in your browser, there are no server costs, no usage caps, and no watermark or branding added to your result.

Does it work on a phone?

Yes. It runs in your phone's browser with nothing to install, so you can use it on Android or iOS. The layout adapts to small screens, making it easy to use on the go, at a party, or in a classroom.

Does it work offline?

Once the page has loaded, it runs entirely on your device, so it keeps working without a connection — which is also why nothing is uploaded. You only need to be online to open the page the first time; after that the tool works locally.

Can I copy or share the result?

Yes. You can copy the result to your clipboard with one click, and many results can be downloaded or shared. Everything is generated locally, so copying and sharing are instant with no upload step.

Is the randomness fair?

Yes. The tool uses your browser's secure random number generator, so every outcome is genuinely unpredictable and each option has an equal chance. It isn't weighted or rigged — results are as fair as a well-shuffled deck or an even spin.

Still have questions?

If you can't find the answer you're looking for, feel free to contact our support team.

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