What is the difference between UUID v1, v4, and v7?

v1: time-based (contains timestamp and MAC address — sequential but reveals device info). v4: fully random (most common, 122 random bits). v7: time-ordered random (new standard — sortable by creation time, ideal for database primary keys).

Why use UUIDs instead of sequential IDs?

UUIDs are globally unique without central coordination — no database lock needed when generating IDs across multiple servers. Sequential IDs expose record counts and are predictable, which can be a security risk.

Is a UUID the same as a GUID?

Yes. GUID (Globally Unique Identifier) is Microsoft's name for the same standard. A GUID and a UUID are the same format and interchangeable in most contexts.

UUID Generator

Generate unique UUIDs/GUIDs instantly

Runs locally in your browser🆓Free — no sign-up🔒100% Private

UUIDs (Universally Unique Identifiers) are 128-bit identifiers used as primary keys in databases, unique resource identifiers in REST APIs, session tokens, file names in distributed systems, and configuration values. UUID v4 is randomly generated and has a collision probability so low it is statistically safe to use as a database primary key without checking for duplicates. A typical UUID looks like: a47bea6c-31d4-4c72-9e1a-8b0f3e5d7a92. This generator creates RFC 4122-compliant UUID v4 identifiers, generating one or a batch of up to 100 at once with a single click to copy, ready to paste directly into your code, database, or configuration file. A common scenario is seeding a development database with test records that need stable, non-colliding IDs — a backend developer can generate a batch of 20 UUIDs here and paste them straight into a SQL INSERT script or a JSON fixture file. Another frequent use case is bootstrapping a new microservice: when a service first registers itself in a service mesh or writes its initial configuration, it needs a permanent identity that will never clash with other nodes, and a freshly generated UUID fills that role instantly. Infrastructure engineers also reach for this tool when provisioning cloud resources manually — assigning a UUID as the correlation ID in a distributed trace, for example, so that logs from multiple services can be tied back to a single originating request. Backend and full-stack developers benefit most from this tool, particularly those working with frameworks like Node.js, Django, Laravel, or Spring Boot where UUID primary keys are a standard pattern. DevOps engineers and QA testers who need throwaway unique values for configuration templates and test harnesses will also find it saves time compared to running a script locally. All generation happens directly in your browser, so no data is sent to any server and nothing you generate is stored or logged anywhere, making it safe to use even in sensitive or air-gapped environments.

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How to use UUID Generator

1.Select the UUID version you need: v1 (time-based), v4 (random), or v7 (time-ordered random).
2.Set how many UUIDs to generate in one batch — from 1 to 100.
3.Click 'Generate' to produce the UUIDs instantly.
4.Toggle uppercase/lowercase formatting to match your project's convention.
5.Click 'Copy All' to copy every generated UUID to your clipboard, one per line.

Key Features

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v1, v4, and v7 — Generate time-based (v1), random (v4), or time-ordered random (v7) UUIDs depending on your use case.

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Batch generation — Generate up to 100 UUIDs in a single operation.

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Case formatting — Toggle between lowercase and uppercase output to match your project's convention.

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Copy all — Copy the entire batch of UUIDs to your clipboard in one click, one UUID per line.

Frequently Asked Questions about UUID Generator

Select the UUID version (v1, v4, or v7), set the quantity, and click Generate. Each UUID appears in the list — click Copy All to copy them all, or copy individual ones.