Free QR Code & Barcode Generator Online - UUID, Hash & More
Barcode Generator
Generate barcodes in your browser for free. Supports Code 128, EAN-13, UPC-A, Code 39, and more. Export as PDF, PNG, or SVG. No uploads, works offline.
Bulk Qr Generator
Generate multiple QR codes at once from a list. Create hundreds of QR codes for URLs, text, or data in seconds. Download as ZIP. Free, private, browser-based.
Event Qr Generator
Generate QR codes for calendar events with iCalendar format. Add event details, dates, location. Scan to import into any calendar app.
Menu Qr Generator
Create QR codes for restaurant menus. Customize frames and colors, download print-ready files. Perfect for table tents and posters. Free and private.
Payment Qr Generator
Generate payment QR codes for PayPal, Venmo, CashApp, Bitcoin, and Ethereum. Add amounts, memos, and download instantly. Free and secure.
Qr Code Generator
Generate fully customizable QR codes online. URL, WiFi, vCard, email, SMS, phone, geo, event. No watermarks, no limits, export PNG/SVG/PDF instantly.
Qr Code With Logo
Generate QR codes with your logo in the center. Customize colors, shapes, and styles. Download high-resolution PNG or SVG.
Social Qr Generator
Create QR codes for Instagram, TikTok, Twitter, LinkedIn profiles. Choose platform colors, download PNG/SVG. Perfect for business cards and marketing.
UUID Generator
Generate UUIDs (v1-v7) and GUIDs instantly in your browser. Free, secure, private. Create bulk identifiers for apps, APIs, and databases.
Vcard Qr Generator
Generate vCard QR codes for instant contact sharing. Add name, phone, email, address, website. Scan to add contacts. Free, private, browser-based.
Wifi Qr Generator
Generate WiFi QR codes instantly for any network. Enter SSID and password, scan to connect. Supports WPA/WPA2, WEP, hidden networks. Free, private, no uploads.
Understanding Codes and Identifiers
Codes and identifiers serve different purposes in software and business. Some need to be unique, some need to be scannable, and some need to be human-readable. Understanding these differences helps you choose the right type for your needs.
UUIDs (Universally Unique Identifiers)
UUIDs are 128-bit identifiers designed to be unique across time and space without coordination. Version 4 UUIDs use random generation, making collisions astronomically unlikely (1 in 2^122). They're essential for distributed systems, database records, and tracking entities across services.
Format: 550e8400-e29b-41d4-a716-446655440000
QR Codes
QR (Quick Response) codes are two-dimensional barcodes that encode text, URLs, contact info, or other data. They're readable by smartphones, making them ideal for marketing materials, product packaging, and contactless interactions. QR codes include error correction, allowing them to work even when partially damaged.
Barcodes
Traditional one-dimensional barcodes encode numbers or short strings. Different formats serve different industries: UPC for retail products, Code 128 for shipping labels, EAN for international trade. Barcode scanners read these quickly and accurately.
Choosing the Right Code
- Database IDs: Use UUIDs for records that need global uniqueness
- Marketing links: Use QR codes for scannable URLs and campaigns
- Product inventory: Use barcodes for warehouse and retail scanning
- Short references: Use sequential codes for human-memorable references