QR Code FAQ

A QR code (Quick Response code) is a two-dimensional barcode that stores information — a URL, contact details, WiFi credentials, or plain text — and can be scanned instantly with any smartphone camera. Invented in 1994 by Denso Wave in Japan for tracking automotive parts, QR codes have evolved into one of the most versatile digital tools available. In 2025, over 1 trillion QR codes are scanned globally each year.

Static QR codes — like the ones generated here — never expire. They encode information directly in the pattern, so there's no server involved and nothing to expire. Dynamic QR codes (offered by paid services) redirect through a server and can be deactivated, but they also require a subscription. Every QR code from qrcode-free.io is static and permanent.

Yes. Since iOS 11 (2017) and Android 8 (2017), built-in camera apps can scan QR codes natively — no third-party app needed. Simply open your camera, point it at the QR code, and tap the notification that appears. Over 4.88 billion people worldwide own a smartphone, making QR codes one of the most universally accessible technologies available.

Traditional barcodes (1D) store data in one dimension — horizontal lines — and can hold about 20-25 characters. QR codes (2D) store data in both dimensions and can hold up to 4,296 alphanumeric characters or 7,089 numeric characters. QR codes are also more resilient: they can be read even with up to 30% of the code damaged, thanks to error correction technology.

The minimum recommended print size is 2cm x 2cm (roughly 0.8 inches). For business cards, 2.5cm x 2.5cm works well. For posters and signage, aim for at least 5cm x 5cm so it can be scanned from a distance. As a rule of thumb, the scanning distance should be 10x the QR code's width — so a 3cm code can be scanned from about 30cm away. Use our "Print" size option (1024x1024px) for any physical materials.

Use SVG for anything that will be printed or resized — it scales to any size without losing quality, making it perfect for business cards, banners, or merchandise. Use PNG for digital use — websites, presentations, social media, and email. Our PNG downloads go up to 1024x1024px, which is sufficient for most print needs as well.

QR codes have built-in error correction (up to 30% of the pattern can be obscured and still scan correctly). This is why adding a small logo in the center works — the error correction fills in the missing data. Our generator currently creates clean, minimal QR codes. For logo-embedded QR codes, you can overlay a logo in any design tool after downloading the SVG.

The most common types are: URL (links to a website), WiFi (auto-connects to a network), vCard (adds a contact to your phone), Email (opens a pre-addressed email), SMS (opens a pre-written text), Text (displays plain text), and PDF/document links. Each type encodes data in a specific format that apps know how to handle. Our generator supports all of these.

QR codes themselves are just data — they can't install malware. However, they can link to malicious websites, just like any URL. Best practice: check the URL preview that appears before tapping it, and only scan codes from trusted sources. For businesses creating QR codes, static QR codes like ours are inherently safer than dynamic ones since the destination can't be changed after printing.

Yes. All QR codes on qrcode-free.io are generated entirely in your browser using JavaScript. Your URLs, WiFi passwords, and contact information never leave your device or reach our servers. There's no account, no tracking of what you generate, and no data stored anywhere.

Static QR codes never stop working on their own — the problem is usually the destination. If a URL QR code stops working, it's because the website it links to has moved, been deleted, or changed its URL structure. Always test your QR code after generating it, and if it links to a URL, make sure that URL is permanent before printing large quantities.