UUID Generator

Free Online UUID Generator - Six UUID Tools in One

This page provides six browser-based UUID utilities accessible from the left sidebar. Every tool runs entirely in your browser. Nothing is uploaded, nothing is stored, and no account is required. Choose a tool from the sidebar, configure your options, and the output appears instantly.

Online UUID Generator - Create Random UUIDs Instantly

A UUID (Universally Unique Identifier) is a 128-bit value used to identify information in computer systems without requiring a central authority. The UUID v4 variant generates identifiers from cryptographically secure random numbers, making collisions practically impossible. This free online UUID generator uses the Web Crypto API built into your browser to produce standards-compliant UUIDs with no server round-trip and no data collection.

How UUID v4 Generation Works

The generator calls crypto.randomUUID() when available, or falls back to a manual implementation using Math.random(). The result is a 128-bit value formatted as 32 hexadecimal digits separated by dashes into five groups: 8-4-4-4-12. The version nibble is set to 4 and the variant bits are set to 10xx, conforming to RFC 4122.

Common Uses for UUID v4

UUID v4 is used as primary keys in distributed databases, correlation IDs in microservices, session tokens in web applications, and unique filenames for uploaded content. Because each UUID is generated independently without coordination, multiple services can create IDs simultaneously without risking collisions.

Free Bulk UUID Generator - Create Thousands of UUIDs at Once

The bulk UUID generator produces up to 10,000 UUIDs in a single operation. This is useful for seeding test databases, populating spreadsheets with placeholder identifiers, or pre-generating batches of IDs for an import process. Choose between one-per-line, comma-separated, or JSON array output. All generation runs in the browser, so there is no API rate limit and no wait time.

Export Formats

The one-per-line format works well for importing into databases or feeding to command-line tools. The comma-separated format is useful for embedding in CSV files or SQL INSERT statements. The JSON array format produces valid JSON that can be pasted directly into a configuration file or API request body.

UUID Validator - Check UUID Format and Version Online

The UUID validator parses a string and determines whether it is a valid UUID conforming to RFC 4122. If valid, it reports the version (1 through 5), the variant (RFC 4122, Microsoft, or reserved), and the canonical lowercase representation. If invalid, it explains exactly why the string does not qualify, covering common mistakes like wrong length, missing dashes, or non-standard version bits.

Supported UUID Versions

Version 1 is time-based with a node identifier. Version 2 is DCE security. Version 3 uses MD5 hashing of a namespace and name. Version 4 is random. Version 5 uses SHA-1 hashing of a namespace and name. The nil UUID (all zeros) is also recognized as a special valid case.

Free UUID v1 Generator - Time-Based Identifier Creation Online

UUID v1 embeds a timestamp and a node identifier, producing identifiers that are naturally ordered by creation time. The timestamp is a 60-bit value representing 100-nanosecond intervals since October 15, 1582. This free online tool uses a random node identifier instead of your MAC address, ensuring privacy while maintaining the time-ordering property.

UUID v1 vs UUID v4

UUID v1 includes time information, which makes the identifiers sortable and allows approximate creation time extraction. UUID v4 is purely random with no embedded metadata. Choose v1 when time ordering matters, such as in event sourcing, audit logs, or time-series databases. Choose v4 when you need maximum randomness and no information leakage.

UUID Shortener - Compact UUIDs for URLs and Storage

A standard UUID is 36 characters long, which is often too much for URLs, QR codes, or SMS messages. The UUID shortener converts the 128-bit value to a 22-character base64url-encoded string. The conversion is completely lossless and reversible. The short form uses only URL-safe characters (A-Z, a-z, 0-9, dash, underscore), so it works in URLs, filenames, and query parameters without encoding.

When to Use Short UUIDs

Short UUIDs save 14 characters per identifier. This matters in URLs where readability and length affect usability, in QR codes where shorter data produces simpler codes, and in databases where storage efficiency is a concern. The short form can always be expanded back to the full UUID, so no data is lost.

Free UUID Extractor - Find UUIDs in Text and Files Online

The UUID extractor scans any block of text for strings matching the standard UUID pattern (8-4-4-4-12 hexadecimal). It handles mixed content like log files, JSON responses, database dumps, and configuration files. Duplicate UUIDs are automatically removed. You can paste text directly or upload a file (.txt, .log, .json, .csv, .xml) for scanning.

File Upload for UUID Extraction

Click the Upload File button to load a local file for scanning. The file is read entirely in the browser. Common use cases include extracting user IDs from server logs, pulling record IDs from database export files, and collecting correlation IDs from distributed tracing output.

Related Developer Tools

If you work with UUIDs and developer utilities regularly, these tools on the site work well alongside this page:

• JSON Formatter - format, minify, validate, and convert JSON data
• Code Formatter - format HTML, CSS, JSON, XML, and JavaScript in one tool
• Hash Generator - generate MD5, SHA-1, SHA-256 and other hash values
• Base64 Encoder/Decoder - encode and decode base64 strings