Free Online Generator Tools
Generate UUIDs, GUIDs, and realistic test data instantly in your browser. Bulk generation, multiple formats, and zero server dependency — ideal for development and testing workflows.
UUID Generator
Generate UUID v4, v1, v7 with bulk support
Fake Data Generator
Generate realistic test data with nested objects
Data Generation Tools for Development & Testing
Generating unique identifiers and realistic test data are two of the most common tasks in software development. DevToolKit provides two powerful browser-based generators that eliminate the need for installing CLI tools or writing throwaway scripts.
The UUID Generator creates universally unique identifiers in three versions: UUID v1 (timestamp-based), UUID v4 (random, the most common), and UUID v7 (timestamp-ordered, ideal for database primary keys). It supports bulk generation of up to 1,000 UUIDs at once with one-click copy and download. UUIDs follow the RFC 4122 specification and are formatted with standard 8-4-4-4-12 grouping.
The Fake Data Generator builds realistic test datasets using a visual schema builder. Define fields with types like name, email, address, phone, date, and custom patterns, then generate anywhere from 1 to 10,000 records. Support for nested objects and arrays makes it suitable for complex API mocking. Export to JSON, CSV, SQL INSERT statements, or XML — or send directly to the Data to Excel tool for .xlsx output. Powered by Faker.js, all generation happens client-side with no data sent to any server.