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Web Tools Calculate network address ranges, broadcast IPs, netmasks, and usable host counts from CIDR blocks. Web Tools Generate Apache basic auth credentials and common redirect rules (Enforce HTTPS, Remove www, 301 Redirects). Web Tools Quick interactive lookup for standard network ports, transport protocols (TCP/UDP), and services. Developer Format, beautify, and minify SQL queries for MySQL, PostgreSQL, SQLite, and MS SQL Server online. Developer Compress HTML and CSS payload sizes or format minified code cleanly online. Developer Minify JS and TS code payloads or un-minify obfuscated scripts online. Developer Convert configuration files bi-directionally between YAML and JSON formats online. Developer Convert Markdown text to HTML code with live visual preview online. Developer Convert images to Base64 Data URIs or decode Base64 strings back to downloadable images online. Developer Format, prettify, and validate GraphQL queries, mutations, and schemas online. Developer Format and pretty-print API responses for debugging, testing, and cleaner JSON output. Developer Encode text to Base64 or decode Base64 content back to plain text instantly. Creative Create polished short bios for social profiles, portfolios, and professional introductions. Creative Generate catchy business name ideas for startups, brands, and new ventures. Developer Build cron expressions for scheduling jobs, tasks, and automation workflows. Finance Convert between major currencies for travel, budgeting, pricing, and estimates. Date & Time Convert Nepali Bikram Sambat dates to Gregorian dates and vice versa. Marketing Create a polished email signature with your contact details and branding. Finance Calculate GST or VAT amounts and totals quickly for invoices and purchases. Developer Generate MD5 and SHA-256 hashes for strings, passwords, and content verification. Marketing Generate relevant hashtags for social media posts and marketing campaigns. Finance Create simple invoices for freelance work, services, and small businesses. Developer Format and validate JSON online with a clean, free developer-friendly interface. Developer Decode JWT headers, payloads, and signatures to inspect authentication tokens safely. SEO Check keyword density in content to improve SEO relevance and readability. Finance Estimate loan EMIs, total interest, and repayment totals for better budgeting. Finance Convert between land measurement units like aana, ropani, bigha, kattha, and square feet. Web Tools Create HTML search engine meta tags (title, description, keywords, robots) for your pages. SEO Preview Open Graph tags and social share cards for Facebook, LinkedIn, and X. Finance Estimate salary, deductions, and take-home pay for payroll planning. Finance Calculate profit, margin, and markup percentages for pricing and business planning. QR & Barcode Generate custom QR codes for URLs, text, and simple messages with styling choices. QR & Barcode Scan and decode QR codes instantly using your camera or by uploading an image. QR & Barcode Generate WiFi QR codes to share network names and passwords securely. QR & Barcode Generate QR codes to initiate emails with pre-filled subject and body. QR & Barcode Generate QR codes to send pre-defined text messages to specific phone numbers. QR & Barcode Generate contact information vCard QR codes for quick scans. QR & Barcode Generate standard barcodes including CODE128, CODE39, EAN-13, and UPC. QR & Barcode Scan and read barcodes from images or live camera streams in your browser. Developer Test regular expressions against sample text and inspect matching results instantly. Web Tools Generate standard robots.txt files with crawl directives and sitemap locations. Web Tools Generate clean, valid XML sitemaps from a list of page URLs for search engines. Text Tools Generate clean, SEO-friendly URL slugs from titles, names, and phrases. Creative Create short, catchy thumbnail text ideas for YouTube and digital content. Marketing Create campaign URLs with UTM parameters for analytics and marketing tracking. Developer Generate version 4 UUIDs for databases, APIs, and system identifiers. Creative Create catchy YouTube title ideas for videos, tutorials, and channel content. Security Generate secure, random passwords with customizable length, symbols, and character sets client-side. Security Generate custom API keys with custom prefixes, lengths, and secure random byte formats. Security Generate secure random CSRF tokens for web forms and API endpoints. Security Generate cryptographically secure random tokens for sessions, passwords, and identifiers. Security Generate single or batch RFC 4122 version 4 UUIDs with formatting and casing options. Security Generate RSA public and private key pairs in PEM format client-side using Web Cryptography API. Security Encrypt plaintext securely using AES (GCM/CBC) algorithms directly in your browser. Security Decrypt AES-encrypted ciphertext using a passcode and initialization vector (IV) client-side. Security Decode and validate JSON Web Tokens (JWT) to check header details, payload claims, and signature validity. Security Analyze and identify unknown cryptographic hash formats such as MD5, SHA-1, SHA-256, and bcrypt. Web Tools Parse any URL string client-side to extract the protocol, host, port, path, query parameters, and hash. Web Tools Shorten long URLs quickly and safely using public url shortening API integration. Web Tools Build campaign URLs with custom UTM parameters (source, medium, campaign name) for tracking. Web Tools Generate Open Graph meta tags to customize social share appearances on Facebook and LinkedIn. Web Tools Generate Twitter Card HTML meta tags to optimize your site share cards on X. 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Unit Converters Convert between weight and mass units such as kilograms, grams, pounds, ounces, and stones. Unit Converters Convert between temperature units such as Celsius, Fahrenheit, and Kelvin in real-time. Unit Converters Convert between area units such as square meters, square miles, acres, and hectares. Unit Converters Convert between volume and liquid capacity units such as liters, gallons, and cubic meters. Unit Converters Convert between speed and velocity units such as mph, km/h, knots, and meters per second. Unit Converters Convert between pressure units such as pascals, bar, psi, atmosphere, and mmHg. Unit Converters Convert between energy and work units such as joules, calories, and kilowatt-hours. Unit Converters Convert between fuel efficiency units such as MPG, L/100km, and kilometers per liter. Unit Converters Convert between angular measurement units such as degrees, radians, and gradians. 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Text Tools Reverse word order coordinates inside sentences.

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Developer Utility

UUID Generator & Inspector

Generate, format, export, and parse RFC 4122 / RFC 9562 Universally Unique Identifiers (v1, v3, v4, v5, v7, Nil, Max).

Quick Presets:
Ready to generate a UUID.
Ready to generate batch.
Enter a UUID above to analyze its version, timestamp, variant, and byte representations.

Universally Unique Identifier (UUID) Overview

A UUID (Universally Unique Identifier) is a 128-bit number used to uniquely identify information in computer systems without requiring a central registration authority.

Version Mechanism / Source Best Use Cases Sortable?
v4 Cryptographically Secure Random Bits Session IDs, tokens, general primary keys No
v7 48-bit Unix Epoch Timestamp + Random Database Primary Keys, Log Indexing (B-Tree friendly) Yes
v1 60-bit Gregorian Timestamp + Node MAC Distributed legacy systems requiring timestamp tracking Partially
v3 MD5 Name & Namespace Hash Deterministic identifier generation from text/names No
v5 SHA-1 Name & Namespace Hash Deterministic identifier generation (preferred over v3) No

Online RFC 4122 & RFC 9562 UUID Generator

Generate secure version 4 random UUIDs, time-sortable version 7 UUIDs, or name-based version 3 & 5 UUIDs instantly. Features high-performance client-side generation, batch generation up to 1000 items, custom syntax code exporting (JSON, SQL, CSV, C#, Java), and a deep UUID structure inspector.

Frequently Asked Questions

Why is UUID v7 recommended for database primary keys?

UUID v7 incorporates a 48-bit millisecond Unix timestamp at the beginning of the identifier. This guarantees chronological sorting order, preventing B-Tree index fragmentation in databases like PostgreSQL, MySQL, and SQLite while keeping collision risk virtually zero.

Are generated UUIDs secure?

Yes. All Version 4 and Version 7 UUIDs are generated in your browser using Web Cryptography crypto.getRandomValues() API, ensuring cryptographic randomness without sending data to external servers.

What is the probability of a UUID collision?

For Version 4 UUIDs, the probability of generating a duplicate is approximately 1 in 2122 (or 5.3 x 1036). You would need to generate 1 billion UUIDs every second for 85 years before having a 50% chance of a single collision.

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