Tools / Random String Generator

Random String Generator

Generate random strings, Nano IDs, ULIDs, UUIDs and hex tokens instantly in your browser. Custom length, character sets, bulk generation up to 100. Cryptographically secure. Free, no signup, no upload.

Random String Generator

Generate random strings, Nano IDs, ULIDs, passwords and UUIDs instantly. Customize length, character sets, and format. Everything runs 100% in your browser.

Length

Character Sets

Lowercase (a-z) Uppercase (A-Z) Numbers (0-9) Symbols (!@#$%^&*)

Custom Characters (optional — overrides checkboxes)

Exclude ambiguous characters (0, O, l, I, 1) Unique characters only (no repeats)

Nano ID — a compact, URL-safe unique identifier. Default 21 characters, using the alphabet A-Za-z0-9_-. Same algorithm as the popular nanoid npm package.

Length

Alphabet

ULID — Universally Unique Lexicographically Sortable Identifier. 26 characters: 10 chars timestamp + 16 chars random. Sortable by time, case-insensitive.

UUID v4 — a 128-bit random identifier in the format xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx. The most common unique identifier standard.

Format

Hex string — random hexadecimal characters (0-9, a-f). Useful for tokens, hashes, and short identifiers.

Length

Case

How Many?

What is the Random String Generator?

It runs 100% in your browser — your files never leave your device, no signup is required, and there are no usage limits or watermarks.

How to Use the Random String Generator

Paste, drop, or type your input into the tool above.
Adjust the options to match what you need.
Preview the result before copying or downloading.
Everything is generated on your device — nothing is uploaded.

Why Use Our Random String Generator?

100% private — files never leave your device.
No signup, no email, no limits — completely free.
Works on any device — desktop, tablet, mobile.
No watermarks, no hidden fees.

Frequently Asked Questions

Is the Random String Generator free?

Yes — completely free with no signup, no email, and no usage limits.

Are my files uploaded to a server?

No. Everything runs in your browser using JavaScript. Your files never leave your device.

Do I need to install anything?

No — just open this page in any modern browser (Chrome, Firefox, Safari, Edge).

Does the Random String Generator work on mobile?

Yes, on iOS and Android browsers. Very large files are best handled on desktop.

Is there a file size limit?

No hard limits. Files under 100 MB work well on most devices.

Random String Generator