UUID v4, v7, v3 and v5 Generator

Generate random UUID v4 values, monotonic sortable UUID v7 identifiers, deterministic namespace UUID v3/v5 values, GUID strings, URN UUIDs, and test constants locally in your browser. For random secrets rather than identifiers, use the password generator.

Version

Amount

ID format

Copy format

Uppercase

Ready

UUID Validator

Reference

UUID v4, UUID v7 and Namespace UUIDs notes

What is UUID v4, UUID v7 and Namespace UUIDs?

UUID (Universally Unique Identifier), also called GUID in some platforms, is a 128-bit identifier format used to identify records, events, files, requests, sessions, and resources without relying on a central sequence.

How does the UUID v4, UUID v7 and Namespace UUIDs tool work?

UUID v4 uses random bytes and is useful when IDs should not reveal order. UUID v7 combines a Unix millisecond timestamp with random data, making IDs sortable by creation time. UUID v3 and UUID v5 are deterministic namespace UUIDs: the same namespace and name produce the same UUID every time.

When should you use UUID v4, UUID v7 and Namespace UUIDs?

Generating UUID v4 values for tests, fixtures, and local development
Creating API request IDs and correlation IDs
Using monotonic UUID v7 values for time-sortable records and logs
Generating deterministic UUID v5 IDs for DNS names, URLs, tenants, and stable resources
Exporting UUID batches as JSON, CSV, or SQL values
Testing UUID validation in forms, APIs, and backend services

What are the limitations of UUID v4, UUID v7 and Namespace UUIDs?

UUIDs are identifiers, not encryption keys or authentication secrets
UUID v4 values are random and do not preserve creation order
UUID v7 exposes approximate creation time through its timestamp component
UUID v3 uses MD5 for deterministic compatibility and should not be treated as a security hash
Hyphenless, URN, quoted, and braced UUID strings are formatting variants of the same identifier
Collisions are extremely unlikely with correct generation but not mathematically impossible

UUID v4 vs UUID v7 vs UUID v5

Version Best for Tradeoff

UUID v4 Random public IDs, request IDs, fixtures No natural ordering

UUID v7 Sortable database IDs, logs, events Contains approximate creation time

UUID v5 Repeatable IDs from namespace + name Same input always creates the same ID

UUID v4, UUID v7 and Namespace UUIDs examples

uuid v4 Generate random UUID v4 -> 550e8400-e29b-41d4-a716-446655440000

uuid v7 Generate sortable UUID v7 -> 018f0d7e-6a4d-7b32-bc21-8f12d6f7f9ab

uuid v5 DNS namespace + adminforge.tech -> Deterministic UUID for the same namespace and name

urn Generate URN UUID -> urn:uuid:550e8400-e29b-41d4-a716-446655440000

validate 550e8400-e29b-41d4-a716-446655440000 -> Valid UUID v4

validate 018f0d7e-6a4d-7b32-bc21-8f12d6f7f9ab -> Valid UUID v7 with decoded timestamp

Security & Identity

JWT Decoder and Encoder Decode JWT tokens, inspect JSON payloads, verify signatures with a secret, and generate HS256 tokens locally in your browser.

Security & Identity

Hash Generator Generate SHA-1, SHA-256, SHA-384, SHA-512, and BCrypt hashes from text for checksums, password hashing, and integrity checks.

Security & Identity

Password Generator Generate secure random passwords with customizable length, uppercase, lowercase, digits, and symbols for strong credentials.

Automation & Patterns

Cron Expression Builder Build readable cron expressions for scheduled jobs and translate minute, hour, day, month, and weekday fields into plain English.

Data & Encoding

Base64 Encoder and Decoder Encode text or images to Base64, decode Base64 strings back to readable text, and preview image data URLs in the browser.

Data & Encoding

JSON Formatter & Validator Format, validate, pretty print, and minify JSON data in your browser for API responses, configuration files, and debugging.

Data & Encoding

JSON to TypeScript Interface Generator Convert JSON objects into TypeScript interfaces and generate sample JSON from simple TypeScript interfaces in your browser.

Custom QR Code Generator Create custom QR codes for URLs, Wi-Fi, vCard, email, SMS, events, and locations with a logo, gradients, module shapes, contrast check, and PNG, SVG, JPEG, or WebP export.

Automation & Patterns

Regex Tester & Debugger Test, debug and replace with regular expressions. Supports Match/Test/Replace modes, positional and named groups, replacement patterns ($1, $&), global matching and detailed match reports.

Data & Encoding

URL Encoder and Decoder Encode and decode URLs, query strings, and text safely for web requests, links, and browser navigation.

Data & Encoding

Timestamp Converter Convert Unix timestamps, ISO dates, local time, UTC time, and timezone offsets directly in your browser.

Data & Encoding

YAML Formatter and YAML to JSON Format simple YAML, convert YAML to JSON, and convert JSON back to readable YAML for configs and manifests.

Text & Documents

Text and JSON Diff Checker Compare two text or JSON snippets side by side and review added, removed, and changed lines locally.

HTTP Headers Analyzer Parse HTTP headers into a table and highlight cache, security, CORS, and content negotiation signals.

CIDR and IP Subnet Calculator Calculate IPv4 network ranges, masks, usable hosts, broadcast addresses, and CIDR prefix details.

Color Converter and Contrast Checker Convert HEX, RGB, and HSL colors and check WCAG contrast ratios for accessible UI color pairs.

User Agent Parser Parse browser user agent strings into browser, engine, operating system, device, and bot hints.

Text & Documents

SQL Formatter Format SQL queries with readable indentation, keyword casing, and line breaks for debugging and reviews.

Text & Documents

Markdown Preview Preview Markdown as HTML, inspect generated markup, and copy rendered HTML without sending text to a server.

Data & Encoding

HTML Entity Encoder and Decoder Encode text as HTML entities, decode entities back to text, and safely prepare snippets for markup.