Free QR Code Generator Online

A QR code is just a 2D barcode that encodes a string — but the difference between a QR code that scans reliably from a restaurant table and one that fails at the slightest smudge comes down to three settings most generators bury or omit entirely: error correction level, module density, and contrast. Our QR Code Generator exposes all three. Error correction levels (L, M, Q, H) let the code recover from damage by encoding redundancy: Low recovers about 7% of damage and produces the smallest, densest code; Medium recovers 15% and is the default for digital-only use; Quartile recovers 25%; High recovers 30% and is the right choice for printed codes that may get scratched, rained on, or partially covered by a logo overlay. The other side of reliability is module size — each black square in the code is a "module," and scanners need a minimum module size relative to scanning distance (rule of thumb: module size in mm = scanning distance in mm / 100). A code on a billboard read from 10 meters needs modules at least 10 cm wide; a code on a business card read at 30 cm needs modules at least 3 mm wide. Contrast matters too: pure black on white is the gold standard, but you can deviate as long as the foreground stays much darker than the background (a contrast ratio of 4:1 minimum). The tool generates QR codes for plain URLs, free text, WiFi credentials (SSID + password + encryption type, so users join your network with one scan), email addresses with subject and body pre-filled, vCard contact info, SMS, phone numbers, and geo coordinates. Output is a high-resolution PNG suitable for both print (300 DPI) and web. Real-world workflows: restaurant menu codes, WiFi joiner codes for cafés and Airbnbs, product packaging linking to instructions, business card vCards, event check-in URLs, and marketing campaign tracking links.