ClockTools Developer Tools

GUID Generator Online

Use our free GUID generator to create bulk UUID v4 or UUID v7 identifiers, format them for code and databases, or validate and inspect an existing UUID.

What Is A GUID Generator?

A GUID generator creates 128-bit identifiers that software can attach to database rows, API resources, files, requests, jobs, events, test fixtures, and distributed records. GUID and UUID are commonly used as practical names for the same identifier family, although GUID is especially familiar in Microsoft and .NET workflows.

Our browser tool generates UUID v4 and UUID v7 values in batches of up to 1,000. It can present them as canonical, uppercase, braced, quoted, compact, URN, Base64, Base64 URL, URL-encoded, JSON, CSV, or SQL output. It also validates existing identifiers and identifies their version, variant, normalized form, and UUID v7 timestamp.

How Do You Use The ClockTools GUID Generator?

  1. Choose UUID v4 for random identifiers or UUID v7 when time-based ordering is useful.
  2. Set a quantity from 1 through 1,000 and choose the format, encoding, and output layout.
  3. Generate the GUIDs and review the batch count and uniqueness status.
  4. Copy the visible output or download it as TXT, CSV, JSON, or SQL.
  5. Use Validate And Inspect to normalize an existing UUID and identify its version, variant, or UUID v7 timestamp.

UUID v4

UUID v4 uses random data with fixed version and variant bits. It is a strong general-purpose choice when an application needs independent identifiers without embedding creation time.

UUID v7

UUID v7 begins with Unix timestamp data and adds random data. It can sort broadly by creation time, which is useful for logs, events, records, and some database index designs.

How Are GUIDs Used In Databases And APIs?

Database teams use UUID columns for primary keys, public identifiers, imports, replication, and records created by independent clients. API teams use them for resource IDs, correlation IDs, requests, jobs, uploads, and event streams. Testers use bulk GUIDs for fixtures, mock responses, seed data, and collision-handling checks.

A UUID is an identifier rather than an automatic password or secret. Security-sensitive tokens need purpose-built entropy, secrecy, expiry, safe storage, authorization, and revocation. Important databases should also enforce unique constraints instead of relying only on probability.

GUID Generator FAQ

What Is A GUID Generator?

A GUID generator creates 128-bit identifiers for database rows, API resources, files, events, tests, and distributed records without requiring one central counter.

Is A GUID The Same As A UUID?

In most modern development work, GUID and UUID refer to compatible 128-bit identifiers. GUID is common in Microsoft contexts, while UUID is the standards-based term.

Which UUID Version Should I Choose?

Choose UUID v4 for a general-purpose random identifier or UUID v7 when approximate creation-time ordering is useful for records, logs, events, or indexes.

How Many GUIDs Can I Generate At Once?

Our bulk GUID generator creates from 1 through 1,000 values in one batch and checks that every generated value in the batch is unique.

Are The Generated GUIDs Stored Or Sent To A Server?

No. Generation, formatting, encoding, validation, and file creation happen locally in your browser.

Can I Generate GUIDs For JSON, SQL, Or CSV?

Yes. Choose a JSON array, SQL quoted values, comma-separated output, or one value per line, then combine the layout with the available formats and encodings.

Can A GUID Be Used As A Password Or Secret Token?

A GUID is an identifier, not automatically a password or secret. Security-sensitive tokens need purpose-built entropy, secrecy, expiry, storage, and authorization controls.

What Does The GUID Validator Check?

It normalizes canonical, compact, braced, parenthesized, quoted, and URN forms, then identifies the version, variant, nil or max values, and the embedded UUID v7 time.

Does The GUID Generator Work On Mobile?

Yes. Generation, output, copy, download, validation, and supporting content adapt to phones, tablets, laptops, and desktop screens.