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Generate single or bulk random UUID v4, modern timestamp-sortable UUID v7 (RFC 9562), and Base32 ULIDs directly in your browser. Decode and inspect creation dates and version specifications with zero server transmission.
Choose between random UUID v4, time-ordered UUID v7, or lexicographically sortable ULID. Set batch quantity from 1 up to 1,000.
Toggle uppercase or hyphens, or wrap output into JSON arrays, SQL IN (...) clauses, or CSV strings for direct database seeding.
Copy formatted output with one click, download .TXT or .JSON files, or switch to the Inspector tab to extract creation timestamps from existing IDs.
Generates cryptographically strong random numbers (CSPRNG) directly in browser memory using Web Crypto `crypto.getRandomValues()`.
Generate standard random UUID v4, modern timestamp-sortable RFC 9562 UUID v7, or lexicographically sortable ULIDs.
Generate up to 1,000 unique UUIDs or ULIDs in milliseconds for database seeding, migrations, and synthetic test data.
Toggle uppercase/lowercase, hyphens, JSON array strings, SQL quote lists, or comma-separated values for instant integration.
Decode any existing UUID or ULID to reveal timestamp creation date, variant type, version RFC, and entropy bit allocation.
Instantly copy formatted lists to clipboard or download generated batches directly as .txt or .json files.
Our UUID & ULID Generator is fully open source under HiMat Technology. Star the repository, audit the Web Crypto implementation, or submit contributions on GitHub.
All identifiers generated by this tool are calculated directly in browser memory using standard Web Crypto APIs (`crypto.getRandomValues()` and `crypto.randomUUID()`). No generated UUIDs or database keys are ever logged or sent over the network.
Format, beautify, validate, minify, and auto-repair complex JSON payloads client-side with zero server transmission.
Decode, inspect, and debug JSON Web Token headers, payloads, and claims with 100% client-side privacy.
Encode and decode web URLs and query parameters into RFC 3986 percent-encoding client-side.
No. The HiMat UUID & ULID Generator relies 100% on native Web Crypto APIs running inside your local browser instance. Zero network requests are made, ensuring complete confidentiality for database keys.
UUID v4 is completely random (122 bits of entropy). UUID v7 (RFC 9562) embeds a 48-bit Unix epoch timestamp followed by random bits, making it sortable and B-tree index friendly for databases. ULID is a 128-bit lexicographically sortable 26-character Base32 identifier designed for high-throughput distributed systems.
Our generator uses `crypto.getRandomValues()` and `crypto.randomUUID()`, which tap into your operating system's Cryptographically Secure Pseudorandom Number Generator (CSPRNG), providing true cryptographic randomness.
Yes, 100% free forever without registration, rate limits, or advertisements.
HiMat Technologies builds robust backend services, microservices architectures, platform engineering infrastructure, and high-performance digital products for modern engineering organizations.