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UUID / GUID v4 Batch Generator
Generate random UUID v4 and GUID codes in batches.
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About UUID / GUID v4 Batch Generator
Generate random UUID v4 and GUID codes in batches of up to 20 with crypto.getRandomValues, plus approximate time-based v1 UUIDs, all free in your browser.
What is a UUID generator?
A UUID generator creates a universally unique identifier — a 128-bit string like 550e8400-e29b-41d4-a716-446655440000 — that is practically guaranteed never to collide with another one. Each UUID is 36 characters long (32 hex digits with four hyphens), and because the space of possible values is enormous, code that generates thousands of IDs a second can treat every value as unique. No registration, central server, or counter is needed to keep the IDs distinct.
UUID v4 vs UUID v7: which should you use?
UUID version 4, the default in this generator, is random: all 122 bits of the identifier are picked randomly by the browser, which makes collisions astronomically unlikely. UUID version 7 is time-ordered — it embeds a millisecond timestamp, so IDs sort by creation time, which helps database indexes and pagination. Neither is "more unique." Choose v4 when all you need is a random, collision-safe ID; choose v7 when you want IDs you can order chronologically without an extra timestamp column.
Is a UUID always 36 characters long?
Standard UUIDs are always 36 characters: 32 hexadecimal digits arranged as 8-4-4-4-12 with four hyphens (e.g. 550e8400-e29b-41d4-a716-446655440000). If you strip the hyphens you get a 32-character UUID — the same ID, just harder for humans to read. If you see an ID shorter than that, it is not a standard UUID but a shorter unique identifier like a NanoID or an auto-incrementing number.
GUID vs UUID: what is the difference?
GUID (globally unique identifier) and UUID (universally unique identifier) are two names for the same thing. Microsoft popularized the term GUID on Windows, while UUID is the name used in the RFC 4122 specification and most developer ecosystems. A GUID generated to the standard is a UUID and vice versa; for practical purposes, treat them as interchangeable 128-bit identifiers.
Can I use these UUIDs as primary keys in a database?
Yes. UUIDs are one of the most common primary-key choices for distributed or synced systems because every client can generate a unique ID offline with zero coordination. The main trade-offs: UUIDs are wider than BIGINT, so indexes take more space and inserts on a large primary-key index can fragment. That is why UUID v7 (time-ordered) is a popular modern choice — it keeps new IDs grouped together and sidesteps the write-hotspot problem.
📐 Methodology & Reference Accuracy:
Calculations, formulas, and conversions execute locally in your web browser. Output models are benchmarked against official reference standards and updated for 2026.
🔒 This tool runs entirely in your browser. Nothing is uploaded or stored.
Background reading: Uuid Generator on Wikipedia. More: all generators.
Frequently Asked Questions about UUID / GUID v4 Batch Generator
How do I generate a 32-character UUID without hyphens?
Generate a standard UUID with this tool, then remove the four hyphens — the result is the same 128-bit ID in 32 hex characters, exactly what many databases and APIs accept. This generator produces canonical 36-character UUIDs; many tools will also read the hyphen-free form directly.
Are UUIDs always unique? Can two UUIDs ever match?
For any practical purpose, yes — a UUID is unique. A v4 UUID has 122 random bits, so the chance of a collision across two values is about one in 10^36. To put that in scale: generating a billion UUIDs per second for a century still leaves the probability of a duplicate astronomically small. Random v4 UUIDs do not need coordination to stay unique.
Is this generator really random and safe for production?
Yes. Random v4 UUIDs here are built with crypto.getRandomValues, the same cryptographically secure random source browsers use for encryption and security tokens, so the values are not merely "random-looking" — they are safe to use in database keys, tokens, and anywhere uniqueness matters.
What version of UUID does this tool generate?
By default it generates version 4 (v4) — fully random UUIDs using the browser's crypto API. You can also choose version 1 (v1), time-based UUIDs, which combine a timestamp with a random node value. Note that the v1 mode here is approximate: it reproduces the time-based layout of a v1 UUID but is not guaranteed to match your machine's real MAC address bits, which matters only for sequential-tracking systems.
Can I generate many UUIDs at once?
Yes — this is a UUID batch generator. Set the count to anywhere from 1 to 20 and it produces that many unique random v4 (or v1) UUIDs in one click. You can then copy the whole batch with a single "Copy" button, which is the fastest way to generate a list of GUIDs for seeding a database or building test fixtures.
What is the difference between UUID and GUID?
None functionally. A GUID (globally unique identifier) is the same 128-bit, 36-character format as a UUID; Microsoft simply popularized the GUID name while the internet standards community calls the format UUID (RFC 4122). Any GUID this tool generates is a valid UUID and vice versa.
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