Free UUID Generator - Create Unique Identifiers Instantly

Free online UUID/GUID generator. Generate UUID v1, v4, v5, v7 and Nil UUIDs. Bulk generate up to 1000 UUIDs, validate, parse timestamps, export to CSV/JSON. 100% client-side, secure.

Single UUID

v4
xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx

Format Options

Bulk Generator

Output (0)

UUID Validator & Parser

UUID v1

Time-based using timestamp and node ID. Good for time-ordered data.

UUID v4

Randomly generated. Most common and recommended for general use.

UUID v5

Name-based using SHA-1 hash. Deterministic - same input = same UUID.

UUID v7

Unix timestamp-based. Sortable, great for database primary keys.

Nil UUID

All zeros. Represents null or uninitialized value.

About This Tool

Generate universally unique identifiers (UUIDs/GUIDs) instantly with our free online tool. Support for all UUID versions including v1 (time-based), v4 (random), v5 (name-based SHA-1), and v7 (timestamp-ordered). Bulk generate up to 1000 UUIDs at once, customize format options, validate existing UUIDs, and export to CSV or JSON. All processing happens in your browser - 100% secure and private.

Frequently Asked Questions

What is a UUID?

A UUID (Universally Unique Identifier), also known as GUID (Globally Unique Identifier), is a 128-bit identifier that is unique across space and time. UUIDs are used in databases, distributed systems, and applications where unique identification is needed without a central authority.

What is the difference between UUID versions?

UUID v1 uses timestamp and MAC address, suitable for time-ordered data. UUID v4 is purely random, most commonly used. UUID v5 generates deterministic IDs from a namespace and name using SHA-1. UUID v7 is the newest standard, combining timestamp with randomness for better database indexing performance.

Which UUID version should I use?

For most applications, UUID v4 is recommended due to its simplicity and randomness. Use v7 for databases that benefit from time-ordered inserts. Use v5 when you need deterministic IDs based on input values. Use v1 for legacy compatibility.

How many UUIDs can I generate at once?

You can bulk generate up to 1000 UUIDs at once. The generated UUIDs can be copied to clipboard or downloaded as CSV or JSON files for easy integration into your projects.

Is this UUID generator secure?

Yes! All UUID generation happens entirely in your browser using the Web Crypto API. No data is sent to any server. The cryptographically secure random number generator ensures high-quality randomness for v4 UUIDs.

What is a Nil UUID?

A Nil UUID is a special UUID where all bits are set to zero (00000000-0000-0000-0000-000000000000). It's used to represent a null or uninitialized value in applications.

Related Tools

Free Base64 Encoder Decoder Online - Encode & Decode Base64

Free online Base64 encoder and decoder. Convert text to Base64 and decode Bas...

Free Color Picker - HEX RGB HSL Converter & Palette Generator

Free online color picker with format conversion. Convert between HEX, RGB, HS...

Free Diff Checker - Text Compare Tool

Free online diff checker. Compare two text files side by side or inline. Find...

Free Hash Generator - MD5 SHA-256 SHA-512 HMAC Calculator

Free online hash generator. Calculate MD5, SHA-1, SHA-256, SHA-512 hashes. Ge...

Free JSON Formatter & Validator Online - Pretty Print JSON

Free online JSON formatter, validator, and beautifier. Format, minify, and va...

Free JWT Encoder / Decoder - Sign, Verify & Inspect Tokens

Free online JWT Decoder and Encoder. Decode, inspect, verify signatures, edit...

Free Lorem Ipsum Generator - Paragraphs, Sentences, Words

Free online Lorem Ipsum placeholder text generator. Generate paragraphs, sent...

Free Online QR Code Generator - Create Custom QR Codes

Free online QR code generator. Create QR codes for URLs, text, WiFi, vCards. ...

Free & Unlimited TikTok Video Downloader Without Watermark

Download any TikTok video without watermark online for free. Fast, secure, an...

Free Unix Timestamp Converter Online - Epoch Time Tool

Free online Unix timestamp converter. Convert epoch time to date, seconds to ...

Free URL Encoder Decoder Online - Encode & Decode URLs

Free online URL encoder and decoder. Encode special characters for URLs or de...

Free Word Counter - Character & Text Analyzer

Free online word counter and text analyzer. Count words, characters, sentence...