Which QR error correction level should you pick?

1. 1

   L (7%)

   Clean digital surfaces, short URLs.

2. 2

   M (15%)

   Default for most print scenarios.

3. 3

   Q (25%)

   Outdoor print, industrial surfaces, small logos.

4. 4

   H (30%)

   Logos, stickers on curved surfaces.

Error correction adds redundancy so the QR decodes even if part is damaged. More redundancy means a denser code for the same data.

Rule of thumb: use M indoors, Q outdoors, and H when adding a logo.

If your QR already looks dense, prefer a shorter URL over a lower correction level.