JsonifyTools
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    UUID Generator

    Generate, analyze, and explore UUIDs (v1, v3, v4, v5, v6, v7, ULID, NanoID) — all processed privately in your browser.

    Everything processed locally No data ever uploaded
    Quick UUID— one click, ready to paste
    generating…
    ⎘Click to copy
    🔥RandomRecommended
    ⚙️ Configuration
    ID Type
    🔥RandomRecommended
    Cryptographically random. Most widely used.
    💼 General purpose, databases, APIs
    Quantity
    Bulk Mode
    Up to 10,000 IDs for test data
    110100
    Format
    UPPERCASE
    ABC-DEF instead of abc-def
    No Hyphens
    Remove — separators
    {Braces}
    Wrap in curly braces
    URN Prefix
    urn:uuid: prefix
    0 IDs
    0 generated~0KB5:57:37 PM
    UUID Reference Guide

    Comprehensive Guide to UUIDs and Unique Identifiers

    From microservices design to high-throughput databases — select, customize, and analyze the right unique identifier format for your application.

    Instant Creation

    Generate up to 1000 UUIDs at once with customize options.

    Zero-Server Leak

    All generators run in-browser sandboxed for maximum security.

    All Major Specs

    Supports RFC 4122 (v1, v3, v4, v5) & RFC 9562 (v6, v7, ULID).

    Sortable Formats

    Create UUID v7 or ULID to maintain insert order in DBs.

    What is a UUID?

    A Universally Unique Identifier (UUID) is a 128-bit string of values used to uniquely identify resources. Unlike standard databases where identifiers are auto-incremented integers, UUIDs can be generated offline by separate clients and merged into databases without conflicts.

    The canonical representation displays 32 hex digits grouped into five segments: 8-4-4-4-12. This yields a total string length of 36 characters (including hyphens). The structure represents various components including the timestamp, clock sequence, node identifier (MAC address), and UUID version bits.

    Understanding UUID Layout

    A standard UUID layout represents 128 bits mapped to hexadecimal groups as follows:

    UUID v4 breakdown (example)
    xxxxxxxx-xxxx-Mxxx-Nxxx-xxxxxxxxxxxx

M  →  UUID Version (e.g. 1, 3, 4, 5, 7)
N  →  Variant (e.g. 8, 9, a, b)

Example UUID:
f81d4fae-7dec-41d0-a765-00a0c91e6bf6
            └─ v4 random UUID
    Version Examples

    Explore different UUID variations

    Select any version below, copy the sample UUID, or inspect its characteristics.

    Sample Output Format
    f81d4fae-7dec-11d0-a765-00a0c91e6bf6

    💡 Generates a fully random ID. Highly unlikely to ever collide. Best for general use cases.

    Which UUID Version Should You Choose?

    Selecting the wrong version can impact security, search performance, and scalability. Here is the breakdown.

    VersionAlgorithmBest ForStandard
    UUID v1Timestamp + MAC AddressDistributed systems where generation sequence mattersRFC 4122
    UUID v3MD5 Hash of Namespace & NameDeterministic lookup keys where input map is fixedRFC 4122
    UUID v4Cryptographically RandomGeneral-purpose IDs, session identifiers, APIsRFC 4122
    UUID v5SHA-1 Hash of Namespace & NameSame as v3, but uses a more secure SHA-1 hashing algorithmRFC 4122
    UUID v7Time-ordered Epoch + RandomPrimary keys in relational databases (PostgreSQL, MySQL)RFC 9562
    ULIDLexicographical Sort + Base32High-performance chronological logging & storage keysAlternative

    How to Use the UUID Studio Generator

    1

    Select Format

    Choose between UUID v1, v4, v7, ULID, or NanoID in the selection grid.

    2

    Configure Options

    Select casing (uppercase/lowercase), add hyphens, add curly braces, or generate in bulk quantities up to 1000.

    3

    Analyze & Parse

    Switch to the Analyze tab, paste any existing UUID, and extract its metadata including version, timestamp, variant, and generation source.

    4

    Integrate Snippets

    Copy drop-in boilerplate code in Node.js, Python, Java, Go, Rust, or C# from the Snippets tab to instantly support UUID creation in your app.

    Common UUID Use Cases
    • Database primary keys - distributed offline ID generation
    • Session IDs - secure, guess-resistant identifier creation
    • Log ordering - sorting log segments sequentially with UUID v7
    • Distributed APIs - secure transaction tokens and tracking IDs
    • Asset uploads - renaming files to prevent file path collisions
    • Microservices - routing messages securely across distributed backends
    UUID Studio Features
    • Generate UUID v1, v3, v4, v5, v6, v7, ULID, and NanoID
    • Bulk generation up to 1000 unique keys in one click
    • Custom formats: optional hyphens, braces, and letter casing
    • Interactive analyzer: parses metadata, epoch timestamp, and location
    • Copy entire output batch or single key instantly to clipboard
    • Code snippets for JavaScript, Python, Go, Rust, Java, and C#
    • Fully sandboxed client-side JavaScript processing
    • No signup, no telemetry, no cookies, 100% free
    UUID Security and Privacy Warning

    While UUIDs are incredibly useful, you should be mindful of security implications. Standard UUID v1 and v6 expose the host MAC address. This means an attacker can trace which server generated the ID, and potentially determine its physical location.

    For public-facing APIs, secure sessions, and user IDs, it is highly recommended to use:

    UUID v4

    For general random ID needs that do not leak internal server details.

    UUID v7

    For databases where sequential ordering is needed without MAC address leaks.

    NanoID

    For high-performance URL-safe keys where shorter characters are preferred.

    💡 If you need cryptographically secure keys, rely on a robust secure random source. This client-side tool uses standard cryptographically secure Web Crypto APIs.

    Frequently Asked Questions

    Common questions about UUIDs, sorting, collision rates, and developer best practices.