Produce the test data and identifiers you need
Building and testing software constantly requires fresh values: a unique identifier for a new record, a sortable key for an event stream, a block of placeholder copy for a layout, or a batch of random data to exercise an edge case. The generators in this category create exactly what you need on demand, with sensible options and instant output.
Generation happens entirely in your browser, which has a real benefit for security-sensitive values: the UUIDs, keys, and PKCE verifiers you create here are produced on your machine and never logged or transmitted. You can generate one value or thousands without any of them touching a server.
Tools in this category
- UUID Generator — Generate UUIDs (v1, v3, v4, v5, and v7).
- ULID Generator — Create lexicographically sortable, time-based identifiers.
- Lorem Ipsum Generator — Produce placeholder text by words, sentences, or paragraphs.
- XSD Generator — Infer an XML Schema from a sample XML document.
- Randomizer — Generate random numbers, strings, and selections.
- PKCE Generator — Create code verifier/challenge pairs for OAuth 2.0.
Common use cases
Generators are the quiet workhorses of development and testing. You might seed a database with realistic-looking records, mock an API response, fill a design mockup with believable copy, create a correlation ID for tracing, derive an XSD to validate incoming XML, or build the PKCE pair needed to secure an OAuth authorization flow. Each tool exposes the options that matter for its format and explains the trade-offs — for example, when to prefer a time-ordered ULID over a fully random UUID v4.
Frequently asked questions
Which UUID version should I use? Version 4 (random) is the safe default for most needs; version 7 adds time ordering, which is useful for database keys. Each tool page explains the differences in detail.
Is the randomness secure? Security-relevant values use the browser’s cryptographic random source. Because everything runs locally, generated secrets never leave your device.
Can I generate values in bulk? Yes. The generators let you produce many values at once and copy or download the result.