Are these strings safe to use as API keys?

Yes — they're generated with the browser's CSPRNG. For 128 bits of entropy use 22 Base64 chars or 32 hex chars.

What's the difference between random string and UUID?

UUIDs follow a standard format (8-4-4-4-12 hex). Random strings can be any length and alphabet — shorter for URL slugs, longer for high-entropy tokens.

Can I avoid lookalike characters?

Yes — toggle "exclude ambiguous" to drop 0, O, 1, l, I from the alphabet.

Random String Generator — Free Online Tool

What is the Random String Generator?

The Random String Generator is a free online random generators from Markvibe. Generate random alphanumeric strings. It runs entirely in your browser — your data never gets uploaded — and works on desktop, tablet and mobile with no sign-up.

Reviewed by The Markvibe Team · Last updated 2026-06-28

Example

A worked example so you know exactly what to expect.

Input

(your input goes here)

Output

(the Random String Generator runs in your browser and shows the result instantly)

How to use Random String Generator

1Pick the length and how many strings you want.
2Choose the alphabet: alphanumeric, hex, Base64, URL-safe, lowercase only, custom character set, or full ASCII.
3Optionally enforce "must contain" rules — at least one digit, symbol, or uppercase letter — for fixture data that satisfies validators.
4Generated strings come from crypto.getRandomValues(), so they're suitable as API keys, invite codes, session tokens and fixture IDs.
5Copy or download the batch as .txt or .csv.

Why use our Random String Generator

✓ 100% free Random String Generator — no sign-up, no watermark, no hidden limits
✓ Runs entirely in your browser so your data never leaves your device
✓ Blazing-fast results — built for speed by Markvibe
✓ Mobile-friendly: use Random String Generator on phone, tablet, or desktop
✓ One of 184+ random generators utilities under one roof
✓ Privacy-first: no tracking of inputs, no accounts, no ads in the tool area