Custom QR Code Studio

Generate styled QR codes for any URL. Adjust foreground/background colors, size and error correction — download as PNG. Runs entirely client-side.

How QR Codes Work

A QR code is a 2D matrix of black and white squares encoding a string — typically a URL. Error correction lets scanners read the code even if 7–30% is damaged or obscured, at the cost of a denser code (more modules).

Error Correction Levels

  • L (Low) — 7% — smallest code for the data. Use when the QR sits on a clean background.
  • M (Medium) — 15% — default. Good balance of density and robustness.
  • Q (Quartile) — 25% — use for print or when part of the QR may be covered.
  • H (High) — 30% — use when embedding a logo or placing outdoors.

Color Guidelines

Contrast matters most. Dark-on-light scans reliably. Light-on-dark may fail on older scanners (many phone cameras expect dark modules on a light background). Use a solid background — gradients and patterns confuse decoders.

Test Before You Print

Scan with at least three devices before publishing. A QR that works on your iPhone may fail on a cheap Android scanner, especially at small print sizes.

QR Code FAQ

How long can the encoded text be?

About 4,000 characters at Low error correction, dropping to ~1,200 at High. URLs of 50–100 characters work comfortably at any level.

Do QR codes expire?

No — static QR codes never expire. Dynamic QR codes (with a redirector) can expire if the redirector is shut down.

Can I embed a logo?

Yes, at High error correction. A logo up to ~25% of the code area is tolerated. Upload to an image editor after generating.

Will colored QR codes work?

Dark-on-light works. Light-on-dark may fail. Keep high contrast — avoid grey, pastel or gradient fills.