Yes, you are free to use them however you like. The generated QR codes have no copyright or license restrictions. You can use them for print materials, websites, business cards, advertisements, or any other purpose.

Error correction allows QR codes to remain readable even if part of the code is damaged or obscured.

L (7%) — Lowest. Produces simpler codes with less data
M (15%) — Standard. Usually sufficient for most use cases
Q (25%) — Higher. Recommended for printed materials
H (30%) — Highest. Recommended when overlaying a logo

Higher levels produce finer (more dense) QR code patterns.

According to the QR code specification, you can store up to approximately 4,296 alphanumeric characters or 1,817 Japanese characters. However, more characters result in a denser pattern that may be harder to scan.

For URLs, typical lengths will work without any issues.

PNG — Supports transparency. Works for both web and print. Most recommended
JPEG — Smaller file size. Does not support transparency
SVG — Vector format that scales without quality loss. Ideal for large-format printing

If unsure, PNG is the safest choice.

No. QR code generation is performed entirely in your browser. The URL or text you enter is never sent to any server.