A UUID (Universally Unique Identifier) is a 128-bit number used to identify information in computer systems. It is written as 32 hexadecimal digits separated by hyphens in the format xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx.
UUID v4 is randomly generated (122 random bits) and is the recommended default for most applications. UUID v1 combines the current timestamp with a node identifier, making it time-sortable but potentially revealing when and where it was created.
You can generate between 1 and 100 UUIDs in a single click. Repeat the process as many times as you need to build larger batches for testing or seeding data.
Yes. The tool is completely free, runs in your browser, and requires no signup or account. There are no usage limits per session.
UUID v4 draws from a 122-bit random space, so the probability of two generated values colliding is vanishingly small — about 1 in 2^61 after generating 1 billion IDs. For practical purposes they are unique.
The page loads once from our site, but the actual UUID computation happens locally in your browser using the Web Crypto API. Once loaded, generation works offline.
No. All UUIDs are created on your device. Nothing you type or generate is transmitted to any server, which keeps the tool private and fast.
Absolutely. UUIDs are a common choice for primary keys and foreign keys, especially in distributed or sharded databases where a central auto-increment counter would be a bottleneck.
They are the same thing. GUID (Globally Unique Identifier) is the name Microsoft uses; UUID is the standards-body term (RFC 4122). The formats are identical.
After generating, click the Copy All button and every value is written to your clipboard, ready to paste into code, a spreadsheet, or a terminal.
A UUID generator creates universally unique identifiers — 128-bit values written as 32 hexadecimal characters in the form xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx. Developers reach for a UUID whenever they need an ID that is practically guaranteed not to collide with another, whether that is a primary key in a database, a request trace in an API, a temporary filename, or a session token. Our free UUID generator builds these identifiers entirely in your browser, so nothing is sent to a server.
Using the tool above takes three steps. First, choose how many identifiers you need (from 1 to 100) with the count field. Second, pick the version — encoding aside, most people want version 4 for randomness. Third, click Generate and the list appears instantly; hit Copy All to send every value to your clipboard. Because the math runs locally with the Web Crypto API, results appear in milliseconds even when you bulk generate a full page of IDs.
UUID v4 is random: 122 of its 128 bits are drawn from a secure random source, giving roughly 2^122 possible values — enough that accidental clashes are astronomically unlikely. UUID v1 is time-based: it mixes the current timestamp with a node identifier (traditionally the MAC address). v1 is sortable and carries a creation time, but it can reveal when and on what machine an ID was made, so v4 is the safer default for public-facing systems. When you need ordered, debuggable keys, a hash-based or time-ordered scheme such as ULID may also be worth a look.
Need hundreds of test rows or seed data? Set the count to 100 and generate as many batches as you like, then paste them straight into SQL, JSON, or a spreadsheet. Unlike server-side services, there is no rate limit and no account to create. If you are wiring IDs into structured payloads, our JSON formatter helps you pretty-print and validate the result.
Every identifier is produced on your device with the browser's crypto.randomUUID() when available, falling back to a standards-compliant random routine. The input never leaves your computer, which means you can safely generate IDs for sensitive internal data. For stronger obfuscation of stored values you can combine UUIDs with a URL or token encoder, but remember a UUID is an identifier, not encryption.
