Database Primary Keys
Generate UUID v7 values to use as fast, sortable, and globally unique primary keys in modern relational database schemas.
ID Generator
UUID Generator
Instantly create universally unique identifiers for your applications, APIs, and databases. Choose between standard random UUID v4 or the modern, time-ordered UUID v7, and easily format your bulk output to match your system's exact requirements.
Understanding UUID v4 vs UUID v7
Not all UUIDs are created equal. For years, the standard has been the UUID v4 generator, which relies entirely on secure random numbers. Because they are completely random, v4 identifiers are excellent for hiding the creation time or sequence of records, making them a popular choice for public-facing API tokens and session IDs.
However, randomly generated IDs can cause severe performance degradation in relational databases due to index fragmentation. This is where the modern UUID v7 generator excels. UUID v7 combines a Unix timestamp with random data, resulting in a time-ordered unique identifier. This means your database can sort and index these records sequentially, dramatically improving insert performance while maintaining global uniqueness.
If you are using UUIDs as primary keys in a relational database like PostgreSQL or MySQL, strongly consider selecting UUID v7.
Comparison: UUID v4 vs UUID v7
A quick reference guide to help you choose the correct UUID version for your specific use case.
| Feature | UUID v4 | UUID v7 |
|---|---|---|
| Generation Method | Completely random | Time-based (Unix Epoch) + Random |
| Database Insert Performance | Slower (causes index fragmentation) | Faster (naturally sequential) |
| Sortability | Cannot be sorted chronologically | Chronologically sortable by default |
| Primary Best Use Case | API keys, session tokens, hidden URLs | Database primary keys, logs, events |
Both versions provide an incredibly low probability of collision, ensuring safe global uniqueness.
Create Reliable Identifiers for Distributed Systems
In modern software development, relying on sequential database IDs often leads to security vulnerabilities and scaling bottlenecks. A UUID (Universally Unique Identifier) solves this by providing a 128-bit label that is statistically guaranteed to be globally unique. Our online UUID generator is designed specifically for developers who need to quickly generate these values for database records, API request tracing, or populating test environments.
Whether you need a single random guid generator or a bulk uuid generator to produce dozens of records simultaneously, this tool offers complete flexibility. You can customize the exact format by choosing between lowercase and uppercase outputs, or generating a compact UUID without hyphens to satisfy strict schema requirements.
All generated UUID values are created securely within the backend and are safe for production database use.
Practical Use Cases
Real-world workflows where this tool shines.
Test Data Creation
Use the bulk generation feature to quickly produce dozens of random identifiers to populate mock APIs and test fixtures.
API Request Tracing
Create standard v4 UUIDs to attach to microservice requests as trace IDs, ensuring logs can be followed across distributed systems.
Who This Is For
The people and teams this tool is especially useful for.
Backend Developers
For software engineers building RESTful APIs and distributed systems requiring collision-free identification.
Database Administrators
For DBAs looking to migrate from sequential integers to performant, time-ordered v7 unique keys.
QA Engineers
For testers who need to quickly copy unique values to validate edge cases and database insert behavior.
How to Generate UUIDs Online
Follow these simple steps to quickly create and format single or bulk unique identifiers for your projects.
01
Choose UUID Version
Select UUID v4 for standard, fully random identifiers, or select UUID v7 if you need time-ordered identifiers for a database.
02
Set Quantity
Choose how many IDs you need to generate. You can request a single ID or configure the bulk generator up to 100 items.
03
Pick Formatting Options
Enable uppercase mode or check the 'no hyphens' option if your target system requires a specific 32-character or capitalized format.
04
Generate and Copy
Click the generate button. Review your list of newly created unique identifiers and copy them into your clipboard for immediate use.
Why Use Our UUID Maker
Built for developers, our online UUID generator simplifies the creation of reliable database IDs, API tokens, and test records.
Modern v7 Support
Stay up to date with modern database practices by utilizing the time-ordered UUID v7 format for optimized indexing.
Bulk Generation Capable
Need to populate a test database? Instantly generate multiple uuids at once, up to 100 unique records per click.
Flexible Output Formatting
Toggle between standard formatting, uppercase strings, or a compact uuid no dashes format to match your API schema.
Developer Friendly
A clean, ad-free interface designed to generate random IDs for development quickly, with easy one-click copying.
Frequently Asked Questions
Learn more about the differences between UUID versions, bulk generation, formatting options, and database best practices.
UUID v4 is entirely random, generated using cryptographically secure pseudorandom numbers. UUID v7, introduced in a newer RFC, incorporates a timestamp followed by random data. This makes v7 values naturally time-ordered and sortable, which is highly beneficial for database indexing.
You should use a UUID v7 generator when the identifier will be used as a primary key in a relational database (like PostgreSQL, MySQL, or SQL Server). Because v7 is time-sequential, it prevents the severe index fragmentation that random v4 UUIDs cause during heavy insert operations.
Yes. Our bulk UUID generator allows you to create multiple identifiers simultaneously. Simply set your desired quantity in the form (up to a maximum of 100), and the tool will instantly output a list of unique values ready to be copied.
Absolutely. UUIDs are widely considered safe and are the standard for distributed database systems. Because they do not rely on a central server to increment sequentially, they prevent attackers from guessing the volume of your data or accessing other records by simply changing a number in a URL.
A standard UUID contains 36 characters (32 alphanumeric characters and 4 hyphens). Some older databases, APIs, or specific string column formats prefer exactly 32 characters to save space or bypass validation strictness. Our tool allows you to easily generate a UUID without hyphens for these exact scenarios.
Practically, yes. GUID stands for Globally Unique Identifier, which is simply Microsoft's implementation and terminology for the UUID standard. A guid generator online will produce the exact same formatted 128-bit string as a standard UUID generator.
Yes. The official RFC specifies that UUIDs should be output in lowercase characters. However, many enterprise systems, legacy databases, and C# environments require uppercase GUIDs. You can use the uppercase uuid generator toggle in our tool to instantly convert the output.
Other Related Free Tools
Text Hash Generator
Generate secure, one-way text hashes online. Support for MD5, SHA-256, SHA-512, SHA3-256, and BLAKE3 with instant hex digest output.
Try now →Decrypt Text Online
Securely decrypt text online using AES-256-GCM and ChaCha20 algorithms. Paste your base64 ciphertext and secret key to instantly recover the original plaintext.
Try now →Free Online Image Metadata Remover
Instantly strip all EXIF data, GPS coordinates, and hidden device details from your photos online. A free privacy scrubber tool to wipe image metadata completely.
Try now →Secure Password Generator
Use a secure password generator to create random passwords from 4 to 512 characters with symbols, numbers, exclusions, and forced included characters.
Try now →Encrypt Text Online
Securely encrypt text online using AES-256-GCM and ChaCha20. Enter your plaintext and secret key to instantly generate base64 encrypted text for safe sharing.
Try now →Quick Access
Explore More Free Online Tools
SEO Image Optimizer & Responsive WebP Generator
Free online SEO image optimizer. Automatically properly size images for Google PageSpeed and generate a responsive WebP ZIP package to boost Core Web Vitals.
Use Tool
Free Image Analyzer Online
Analyze image dimensions, format, DPI, and extract color palettes instantly. Free online EXIF data viewer to check hidden metadata and image properties.
Use Tool
Convert PDF to JPG & PNG Free
Free online tool to save PDF as images. Convert your document to high-quality PNG or JPG files, split pages into separate JPEGs, and download as a ZIP.
Use Tool
Free Image DPI & PPI Checker Online
Check image DPI and PPI instantly online. Free tool to analyze print quality, pixel dimensions, and verify if your photo meets the 300 DPI professional print standard.
Use Tool
WhatsApp Image Optimizer & DP Size Converter
Free online tool to resize image for WhatsApp DP and compress photos to prevent blurry status uploads. Reduce image size under 1MB with no cropping.
Use Tool
Instagram Photo Resizer & Optimizer
Free online Instagram photo resizer. Resize images to exactly 1080px for posts, stories, and reels to prevent blurry uploads. No watermark, no signup.
Use Tool
Custom Target KB Image Compressor
Reduce image file size to an exact target KB online for free. Compress JPEG or PNG to 100kb, 200kb, or any custom size with full manual control and no watermarks.
Use Tool
PDF DPI Checker
Check the DPI and resolution of embedded images in your PDF files online. Analyze PPI per page to ensure your document is ready for high-quality printing.
Use Tool
Convert Image to BMP
Free online tool to convert JPG, PNG, and WebP images to BMP (Bitmap) format. Fast, lossless pixel conversion for legacy systems and specialized printing.
Use Tool
Image to TIFF Converter
Convert photos to high-resolution TIFF files for professional printing and archiving. Free online lossless image format converter with zero watermarks.
Use Tool
Utility Suite
Browse Tool Categories
Explore our powerful collection of online tools designed to help you convert, edit, optimize, and analyze your images and documents instantly — all directly in your browser.
E
Editing Tools
Edit images in browser with the best online photo editor. A free picture editing website to crop, change image size online, and enhance visual quality.
Open Tools
S
Social Media Tools
Perfectly resize image for social media. Our app to resize photos for social media includes a facebook cover photo resizer and handles Twitter image sizing.
Open Tools
O
Optimization Tools
Compress JPEG online free and reduce image size without losing quality. Use our pagespeed image optimizer to shrink files by 80% and boost loading speed.
Open Tools
S
SEO Tools
Enhance search engine visibility with our seo image optimizer. Use the favicon online maker to generate favicon from png and convert logo to favicon.
Open Tools
A
Analysis Tools
Use our online metadata viewer to view EXIF data online. Check image resolution, get color schemes, and inspect image properties instantly.
Open Tools
C
Conversion Tools
Use the Snappy Fix image converter tool to effortlessly change photo file types. Convert PNG to JPG free, swap WebP, and decode Base64 with zero data loss.
Open Tools
P
PDF Tools
Manage and optimize files with the Snappy Fix PDF suite. Compress large PDF files, edit documents online free, and securely convert images to PDF.
Open Tools
S
Security Tools
Discover how to safely share photos online with our image meta data remover. Remove metadata from JPG, erase EXIF data, and use our strong password generator.
Open Tools
Browse All Tool Categories
No Account Required • 100% Free