Best Free UUID Generator Online (2026) — v1, v4, v5, Bulk Generation

Updated April 20, 2026 · 9 min read

Reviewed by the EverydayTools Editorial Team

Quick answer: EverydayTools UUID Generator is the best free web tool for generating UUID v1, v4, and v5 in bulk with no signup. For developers, crypto.randomUUID() (browser/Node.js) is the fastest programmatic option. For database primary keys at scale, consider UUID v7 (time-ordered) instead of v4 to prevent index fragmentation.

Every web application, database, and distributed system eventually needs a way to generate unique identifiers. UUIDs (Universally Unique Identifiers) are the standard solution — 128-bit values that are unique without requiring a central coordination server. In 2026, there are multiple UUID versions (v1, v4, v5, v7) and many free generator tools. This comparison helps you pick the right one.

Top Free UUID Generators Compared (2026)

ToolVersionsBulk GenerateValidatorPrivacySignup
EverydayToolsv1, v4, v5Up to 100✓Browser-onlyNo
uuidgenerator.netv1, v3, v4, v5Limited✓Server-sideNo
Online UUID Toolsv1–v5Up to 500✓Server-sideNo
UUID Generator (freecodeformat)v4 onlyNoNoBrowserNo

Detailed Reviews

1. EverydayTools UUID Generator — Best All-Around Free Tool

The EverydayTools UUID Generator runs entirely in the browser using the Web Crypto API (crypto.randomUUID() for v4) and custom implementations for v1 and v5. No UUID data is sent to any server. It supports:

  • UUID v4 (random, cryptographically secure)
  • UUID v1 (timestamp-based, with random node ID)
  • UUID v5 (deterministic, SHA-1 of namespace + name)
  • Bulk generation up to 100 UUIDs at once
  • Copy as newline-separated, JSON array, or CSV
  • UUID validator with version detection

Best for: Developers who need quick UUID generation without an external server dependency, security-conscious teams, and anyone who needs v5 deterministic UUIDs for deduplication workflows.

2. uuidgenerator.net — Best for All UUID Versions Including v3

uuidgenerator.net covers UUID v1, v3, v4, and v5. UUID v3 (MD5-based namespace UUIDs) is rarely needed but supported here where most tools omit it. The validator shows the UUID version, variant, and whether it conforms to RFC 4122. However, UUIDs are generated server-side, so treat results as non-private.

Best for: Developers who specifically need UUID v3 (MD5-based) for legacy systems or standards compliance, or who want a comprehensive RFC 4122 validator.

3. crypto.randomUUID() — Best for Developers (Built-in)

If you're a developer generating UUIDs programmatically, the best tool is no tool at all: crypto.randomUUID() is built into all modern browsers and Node.js 15+. It generates a RFC 4122-compliant UUID v4 using a cryptographically secure random number generator. Zero dependencies, zero latency, zero server calls.

Best for: Any JavaScript or Node.js application that needs UUID generation. This is the recommended approach for production code — no external library needed for v4.

UUID v4 vs UUID v7: The 2026 Shift

The biggest development in UUIDs in recent years is the publication of RFC 9562 (2024), which standardized UUID versions 6, 7, and 8. UUID v7 is gaining adoption as the preferred primary key format for databases because it is:

UUID v4 (Current Standard)

  • ✓ Truly random, no timing information
  • ✓ Maximum entropy for security
  • ✓ Supported everywhere
  • ✗ Random inserts fragment B-tree indexes
  • ✗ Cannot sort by creation time

UUID v7 (Emerging Standard)

  • ✓ Millisecond timestamp prefix (sortable)
  • ✓ Sequential inserts → no index fragmentation
  • ✓ Same uniqueness guarantees as v4
  • ✓ Works as a drop-in replacement for v4
  • ⌛ Still gaining library support

For new database designs with high write volumes, UUID v7 is the modern recommendation. Popular ORMs and databases (PostgreSQL 17, MySQL 8.0+, Hibernate 6.2, Laravel 10) are adding native UUID v7 support. For existing systems already using v4, migration is typically straightforward.

UUID Formats: With and Without Hyphens

UUIDs can be represented in three common formats. All represent the same 128-bit value:

Standard (RFC 4122)
550e8400-e29b-41d4-a716-446655440000

Most common, recommended format

Without hyphens
550e8400e29b41d4a716446655440000

Used in some databases and APIs for compactness

URN format
urn:uuid:550e8400-e29b-41d4-a716-446655440000

Used in XML, LDAP, and formal URI contexts

Verdict

For web-based generation without a terminal: EverydayTools UUID Generator is the best free option with v1/v4/v5 support, bulk generation, and full browser privacy. For production code: use crypto.randomUUID(). For new database primary key designs: evaluate UUID v7 from the uuid npm package (v9+) or the uuid7 Python package.

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