Question 1

What is a QR code and how does it work?

Accepted Answer

A QR (Quick Response) code is a two-dimensional barcode that stores data in a matrix of black and white squares. It was invented by Denso Wave in 1994 for tracking automotive parts. QR codes use Reed-Solomon error correction to remain scannable even when partially damaged (up to 30% of the code can be obscured). When scanned, the reader decodes the pattern back into text, URLs, contact information, or other data types.

Question 2

What types of data can I encode in a QR code?

Accepted Answer

QR codes can encode any text-based data: URLs (http/https links), plain text, email addresses (mailto: links), phone numbers (tel: links), SMS messages (sms: links), vCard contact information, Wi-Fi credentials, geographic coordinates, calendar events (vCal/iCal), cryptocurrency addresses, and more. Our generator supports URL, text, email, phone, SMS, and full vCard formats.

Question 3

What is the difference between static and dynamic QR codes?

Accepted Answer

A static QR code encodes data directly — the destination is baked into the pattern and cannot be changed after printing. A dynamic QR code encodes a short redirect URL that points to a server; the server can change the final destination at any time without reprinting the code. Dynamic codes also enable scan tracking and analytics. Static codes are simpler, work offline, and have no dependencies.

Question 4

What is the maximum data capacity of a QR code?

Accepted Answer

A QR code can store up to 7,089 numeric characters, 4,296 alphanumeric characters, or 2,953 bytes of binary data (at the lowest error correction level). In practice, shorter data produces simpler, more scannable codes. URLs and text up to a few hundred characters work best. Very long data creates dense codes that may be difficult to scan, especially at small sizes.

Question 5

What error correction level should I use?

Accepted Answer

QR codes offer four error correction levels: L (7% recovery), M (15%), Q (25%), and H (30%). Higher correction means the code can be scanned even when partially damaged or obscured (useful for printed materials that might get worn). However, higher correction also increases the code's density. Level M is the default and works well for most use cases. Use H if you plan to overlay a logo on the code.

Question 6

Should I download my QR code as PNG or SVG?

Accepted Answer

SVG (Scalable Vector Graphics) is best for print — it scales to any size without losing quality and produces smaller file sizes. PNG is best for screens and quick sharing — it's universally supported and renders consistently. For business cards, posters, and packaging, always use SVG. For social media, emails, and web pages, PNG works perfectly.

Question 7

How do I scan a QR code?

Accepted Answer

Most modern smartphones can scan QR codes directly through the built-in camera app (iOS 11+, Android 9+). Open the camera, point it at the QR code, and a notification will appear with the decoded content. For older devices, download a free QR scanner app. Desktop users can use browser extensions or upload an image to an online decoder.

Question 8

Are QR codes secure? Can they be malicious?

Accepted Answer

QR codes themselves are just data containers — they're not inherently secure or insecure. However, a QR code can encode a malicious URL that leads to phishing sites, malware downloads, or unwanted actions. Always check the URL before visiting it. Reputable QR scanners show the URL before opening it. Never scan QR codes from untrusted sources, and be cautious with codes in public places that may have been tampered with.

Question 9

Can I add a logo or image to my QR code?

Accepted Answer

Yes, thanks to error correction, you can overlay a small logo (typically up to 10-15% of the QR code area) on the center of the code and it will still scan. Use error correction level H (30%) for the best results with logos. Keep the logo simple, high-contrast, and centered. Our basic generator creates standard codes; for logo embedding, you'd apply the logo overlay after downloading the SVG or PNG.

Question 10

How small can a QR code be and still work?

Accepted Answer

The minimum practical size depends on the scanning distance and the code's complexity (module count). As a rule of thumb: each module (smallest square) should be at least 0.25mm for close-range scanning (business cards) or 2-3mm for distance scanning (posters). A simple URL code is typically scannable at 2cm × 2cm. Always test your printed QR code before large-scale production.

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