Free online generators for UUIDs, passwords, QR codes, Lorem ipsum placeholder text, barcode images, fake test data, random values, and more - all running in your browser with no account required. The Password Generator uses the browser's cryptographically secure random number generator (window.crypto) to produce unguessable passwords with configurable character sets and lengths. The UUID Generator produces RFC 4122 compliant v4 UUIDs for use as database primary keys and unique identifiers. The QR Generator creates print-ready QR codes from any URL or text, with customisable sizes and error correction levels.

When to use Generators

1Database development: generate batches of v4 UUIDs as primary keys for new records, or generate realistic fake data (names, emails, addresses, phone numbers) for seeding test databases.
2Security and authentication: generate strong random passwords for accounts, API keys for services, or secure random tokens for CSRF protection and session identifiers.
3Marketing and printing: generate QR codes for URLs, WiFi credentials, vCards, or payment links for use on business cards, flyers, packaging, and signage.
4Content prototyping: use Lorem ipsum to fill design mockups and UI wireframes with realistic-length placeholder text before real content is available.
5Testing and QA: generate barcodes (EAN, Code 128, QR) to test barcode scanner integrations, or create realistic-looking fake user data for UI testing.

Frequently Asked Questions

What is a UUID and when should I use it?+

A UUID (Universally Unique Identifier) is a 128-bit number represented as 32 hexadecimal characters in the format 8-4-4-4-12 (e.g. 550e8400-e29b-41d4-a716-446655440000). Use UUIDs as database primary keys when you need globally unique IDs without a central counter - ideal for distributed systems, offline-first apps, and APIs that need to create records on the client before syncing to the server.

How secure is the Password Generator?+

The Password Generator uses window.crypto.getRandomValues(), the browser's cryptographically secure pseudo-random number generator (CSPRNG). This is the same entropy source used for TLS key generation. A 16-character password using uppercase, lowercase, numbers, and symbols has approximately 95 bits of entropy - unbreakable with current computing power.

What error correction level should I use for QR codes?+

Error correction level L (7% correction) produces the smallest QR code - suitable for digital display where the code will not be damaged. Level M (15%) is the default for most uses. Level Q (25%) and H (30%) allow the QR code to be read even if up to 25–30% of the code is obscured or damaged - use these for printed materials that may be worn or folded.

Is Lorem ipsum real Latin?+

Lorem ipsum is derived from Cicero's 'de Finibus Bonorum et Malorum' (45 BC) but has been deliberately scrambled into nonsense. It is used in typography and design because it approximates the letter frequency and word length distribution of real English text, making layouts look realistic without distracting readers with meaningful content.

About Generators

When to use Generators

1Database development: generate batches of v4 UUIDs as primary keys for new records, or generate realistic fake data (names, emails, addresses, phone numbers) for seeding test databases.

2Security and authentication: generate strong random passwords for accounts, API keys for services, or secure random tokens for CSRF protection and session identifiers.

3Marketing and printing: generate QR codes for URLs, WiFi credentials, vCards, or payment links for use on business cards, flyers, packaging, and signage.

4Content prototyping: use Lorem ipsum to fill design mockups and UI wireframes with realistic-length placeholder text before real content is available.

5Testing and QA: generate barcodes (EAN, Code 128, QR) to test barcode scanner integrations, or create realistic-looking fake user data for UI testing.

Frequently Asked Questions

What is a UUID and when should I use it?+

How secure is the Password Generator?+

What error correction level should I use for QR codes?+

Is Lorem ipsum real Latin?+