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A UUID generator creates universally unique identifiers for databases, APIs, logs, distributed systems, and test data. UUID Generator Pro supports v1, v4, v5, and v7 formats, validates existing IDs, and keeps generation private by running entirely in your browser.
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UUID Generator is a free, browser-based tool for creating universally unique identifiers instantly. Whether you need random v4 UUIDs, time-based v1 identifiers, deterministic v5 generation, or sortable v7 UUIDs, this tool supports all major UUID versions.
All UUIDs generated client-side using cryptographically secure Web Cryptography API. No data transmission.
Export generated UUIDs as JSON, CSV, or plain text. Batch generate up to 1,000 UUIDs at once.
Validate any UUID format and detect its version. Supports dashes, braces, and raw hex formats.
Generated using timestamp (date/time) and MAC address. Sortable by creation time. Best for sequential application logs.
Use case: Database entries that need chronological ordering
Pure random generation. Most commonly used. Extremely low collision probability. No timestamp or identifying information.
Use case: Default choice for most applications (web apps, APIs, databases)
Deterministic: same input always generates same UUID. Uses SHA-1 hash of namespace + name. Supports DNS, URL, OID, X.500 DN namespaces.
Use case: Reproducible IDs from email addresses or domain names
Modern sortable format using Unix timestamp. Better for distributed systems and databases. More collision-resistant than v1 with time-ordering benefits.
Use case: Modern databases requiring sortable IDs (Postgres, MongoDB)
A UUID (Universally Unique Identifier) is a 128-bit unique identifier defined by RFC 4122. It's represented as a 36-character string with hyphens (e.g., 550e8400-e29b-41d4-a716-446655440000). UUIDs are used to uniquely identify objects, database records, and transactions across distributed systems.
GUID (Globally Unique Identifier) is Microsoft's term for UUID. They are the same standard (RFC 4122). Microsoft uses GUID in Windows and .NET. UUID is the open standard name. Both terms refer to identical functionality and can be used interchangeably.
v4 (Random): Use by default. Best for most applications. Recommended for 99% of use cases.
v1 (Time-based): Use when you need temporal ordering and the MAC address won't compromise privacy.
v5 (SHA-1 Hash): Use when you need reproducible IDs from existing data (emails, domain names).
v7 (Unix Epoch): Use in modern databases that require sortable IDs with Unix timestamp prefixes.
Yes, absolutely. This generator uses the Web Cryptography API (crypto.getRandomValues()), which provides cryptographically secure randomness in all modern browsers. All UUID generation happens client-side — nothing is transmitted to servers. Your data never leaves your device.
Yes. After generating UUIDs, use the Download button to export in your preferred format: JSON (structured data), CSV (spreadsheet-compatible), or plain text (one UUID per line). You can also copy individual UUIDs or all at once.
You can generate up to 1,000 UUIDs in a single batch. This is useful for bulk operations or populating databases. All generation happens instantly in your browser.