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UUID / NanoID Generator

Encoding & Encryption · Free Online Tool

Generate UUID v4 and NanoID in bulk.

By EZ4Code Team

This tool runs interactively in your browser. Please visit ez4code.com/tools/uuid-generator to use it.

How to Use UUID / NanoID Generator

  1. 1Enter or paste your data into the input field.
  2. 2Select the desired encoding, hashing, or encryption options.
  3. 3Click the action button to process your data.
  4. 4Copy the result from the output field.

Features

  • ✓100% free — no signup, no subscription, no ads
  • ✓Runs entirely in your browser — data never leaves your device
  • ✓Fast and lightweight — instant results
  • ✓Cross-platform — works on desktop, tablet, and mobile

What is UUID / NanoID Generator?

UUID (Universally Unique Identifier), defined by RFC 4122 and updated by RFC 9562, is a 128-bit identifier represented as 8-4-4-4-12 hexadecimal string (e.g., 550e8400-e29b-41d4-a716-446655440000). UUIDs are designed to be globally unique without central coordination, making them ideal for distributed systems.

How does UUID / NanoID Generator work?

UUID v4 uses cryptographically secure random numbers for 122 bits (6 bits are version/variant markers). UUID v7 (RFC 9562) combines a Unix millisecond timestamp with random bits, producing time-sortable IDs that improve database index locality. Collision probability for v4 is negligible (~10^-37).

Common Use Cases

  • ✓Database primary keys — avoid auto-increment ID conflicts in sharded DBs
  • ✓Distributed systems — unique IDs without central coordinator
  • ✓Message tracking — correlation IDs in microservices
  • ✓Session tokens — unique session identifiers

UUID v4 vs UUID v7

v4 is fully random; v7 is time-sortable (RFC 9562). v7 IDs generated close in time share prefixes, improving B-tree index locality and database write performance. v4 creates random index entries causing fragmentation. For new systems requiring database storage, prefer v7; for pure randomness (e.g., tokens), v4 is fine.

Security & Privacy

This tool uses the Web Crypto API (crypto.getRandomValues) for cryptographically secure random numbers. UUIDs are identifiers, NOT security tokens — they are predictable in structure. For security tokens, use a dedicated token generator with sufficient entropy.

Technical Details

Standard: RFC 4122 (original), RFC 9562 (2024 update with v6/v7/v8). Format: xxxxxxxx-xxxx-Mxxx-Nxxx-xxxxxxxxxxxx (M=version, N=variant). v1: timestamp + MAC address. v3: MD5 hash of name. v4: random (122 bits). v5: SHA-1 hash of name. v6: reordered v1 (time-sortable). v7: Unix ms timestamp + random. v8: custom. Version bits: bits 48-51 of the UUID.

Frequently Asked Questions

Can UUIDs collide?

Theoretically yes, practically no. v4 has 2^122 possible values — the probability of collision among 10^18 UUIDs is ~10^-15. You are more likely to be struck by a meteor.

Should I use UUID as a primary key?

Yes for distributed systems. Prefer v7 for better index locality. v4 random UUIDs can cause index fragmentation at scale. Alternatively use snowflake IDs or ULID.

What is the difference between UUID and GUID?

GUID is Microsoft's implementation of UUID (RFC 4122). They are functionally identical. GUID typically uses mixed case; UUID standard is lowercase.

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