UUID Generator

UUID Generator Generate secure, random UUID version 4 identifiers for database entries, API keys, or development testing. Supports single or bulk generation with multiple output formats. Quick Start

Enter the number of UUIDs you want to generate (1-100) Select your preferred output format (standard, uppercase, no hyphens, or with braces) Click "Generate UUIDs" to create your unique identifiers Copy individual UUIDs or download all results at once

Features UUID Generation Generate cryptographically secure UUID v4 identifiers using random number generation. Each UUID is guaranteed to be unique with a collision probability of less than 1 in 5.3×10³⁶. Multiple Format Options

Standard Format: Lowercase with hyphens (xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx) Uppercase Format: All characters in uppercase No Hyphens: Compact format without separators With Braces: Enclosed in curly braces for certain programming contexts

Custom Prefixes (Pro Feature) Add custom prefixes to your UUIDs for better organization and identification. Perfect for namespacing database entries or categorizing API keys. Bulk Processing (Pro Feature) Upload CSV files to generate thousands of UUIDs at once. Each row can specify different quantities and formats. History Tracking (Pro Feature) Keep track of all generated UUIDs with timestamps and generation parameters for audit trails and reproducibility. Export Options (Pro Feature) Download results in multiple formats:

Plain text (.txt) CSV (.csv) JSON (.json)

How to Use Single Generation

Set the quantity field to the number of UUIDs needed Choose your preferred format from the dropdown For Pro users: optionally add a custom prefix Click "Generate UUIDs" Copy individual UUIDs by clicking the "Copy" button next to each Use "Copy All" to copy all generated UUIDs at once Click "Download" to save results as a text file

Bulk Generation (Pro Only)

Prepare a CSV file with columns: quantity, format, prefix Click the upload zone or drag and drop your CSV file Review the file information displayed Click "Process Bulk Upload" Wait for processing to complete Download results in your preferred format (CSV, JSON, or TXT)

CSV Format Your CSV file should have three columns: quantity,format,prefix 5,standard,user_ 10,uppercase, 3,no_hyphens,api_

quantity: Number of UUIDs to generate (1-100 per row) format: One of: standard, uppercase, no_hyphens, braces prefix: Optional custom prefix (Pro only, max 20 characters)

FAQ Q: What is a UUID? A: A UUID (Universally Unique Identifier) is a 128-bit number used to uniquely identify information in computer systems. UUID version 4 uses random generation to ensure uniqueness across all systems without requiring central coordination. Q: Are the generated UUIDs truly unique? A: Yes! Our UUID v4 generator uses cryptographically secure random number generation (CSPRNG). The probability of generating a duplicate UUID is approximately 1 in 5.3×10³⁶, which is astronomically small. For practical purposes, UUIDs are guaranteed to be unique. Q: What's the difference between UUID formats? A: The standard format includes hyphens for readability (xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx). Uppercase converts all letters to capitals. No hyphens removes separators for compact storage. Braces format adds curly brackets for languages that require them (like C#). Q: Can I generate UUIDs in bulk? A: Yes! Pro users can upload CSV files to generate thousands of UUIDs at once. Free users can generate up to 100 UUIDs per request. Bulk processing is perfect for database seeding or mass API key generation. Q: What is the daily limit for free users? A: Free users can generate up to 50 UUIDs per day. Pro users have unlimited generation. Each generation request counts toward your daily limit regardless of quantity. Q: How do custom prefixes work? A: Custom prefixes (Pro feature) let you add a string before each UUID. For example, with prefix "user_", you get "user_f47ac10b-58cc-4372-a567-0e02b2c3d479". This is useful for namespacing or categorizing identifiers. Q: Can I use these UUIDs in production? A: Absolutely! Our UUIDs are generated using industry-standard methods and are suitable for production use in databases, APIs, file systems, and any application requiring unique identifiers. Q: What's the maximum number of UUIDs I can generate at once? A: Single requests support up to 100 UUIDs. Pro users can process bulk CSV files with limits based on tier: Basic (50 rows), Gold (200 rows), Ultimate (1000 rows). Each row can generate multiple UUIDs. Q: Do you store the UUIDs I generate? A: Free users: We don't store generated UUIDs. Pro users: If history tracking is enabled, UUIDs are stored for your records and can be accessed later. You can disable history tracking in your account settings. Examples Example 1: Generate Single UUID Input:

Quantity: 1 Format: Standard

Output: f47ac10b-58cc-4372-a567-0e02b2c3d479

Example 2: Generate Multiple UUIDs

Input: - Quantity: 5 - Format: Uppercase

Output: A1B2C3D4-E5F6-4789-A012-B3C4D5E6F7A8 B2C3D4E5-F6A7-489A-B123-C4D5E6F7A8B9 C3D4E5F6-A7B8-49AB-C234-D5E6F7A8B9C0 D4E5F6A7-B8C9-4ABC-D345-E6F7A8B9C0D1 E5F6A7B8-C9D0-4BCD-E456-F7A8B9C0D1E2

Example 3: UUID Without Hyphens

Input: - Quantity: 1 - Format: No Hyphens Output: f47ac10b58cc4372a5670e02b2c3d479

Example 4: UUID With Custom Prefix (Pro)

Input: - Quantity: 3 - Format: Standard - Prefix: user_ Output: user_f47ac10b-58cc-4372-a567-0e02b2c3d479 user_a8b9c0d1-e2f3-4a5b-6c7d-8e9f0a1b2c3d user_b9c0d1e2-f3a4-4b5c-6d7e-8f9a0b1c2d3e Troubleshooting Error: "Daily limit reached" Your free account has reached the daily limit of 50 UUIDs. Wait until tomorrow or upgrade to Pro for unlimited access. Error: "Quantity must be between 1 and 100" Ensure the quantity field contains a number from 1 to 100. Bulk processing is required for larger quantities. Error: "Invalid prefix format" Prefixes must be alphanumeric with hyphens or underscores only, and cannot exceed 20 characters. Special characters are not allowed. CSV Upload Fails Ensure your CSV file:

Has the correct headers: quantity, format, prefix Contains valid format values: standard, uppercase, no_hyphens, braces Does not exceed your tier's row limit Is properly formatted with commas separating columns

Generated UUID Appears Invalid All our UUIDs conform to RFC 4122 version 4. If a system rejects a UUID, check:

The system's UUID format requirements Whether the system expects a specific case (upper/lower) Whether hyphens are required or forbidden

Technical Details UUID Version 4 Specification Our generator follows RFC 4122 section 4.4 for UUID version 4:

Bits 12-15 (version) are set to 0100 (4) Bits 6-7 (variant) are set to 10 All other bits are generated using CSPRNG

Security We use PHP's random_bytes() function which provides cryptographically secure random data suitable for security-sensitive operations. Performance UUID generation is extremely fast:

Single UUID: <1ms 100 UUIDs: <10ms Bulk processing: ~100ms per 1000 UUIDs

Browser Compatibility The tool works in all modern browsers including Chrome, Firefox, Safari, and Edge. Internet Explorer is not supported.