Verificador de Contraste de QR
Comprueba si los colores de tu QR se pueden escanear.
Puntos claros sobre fondo oscuro pueden no escanearse. Usa puntos oscuros sobre fondo claro.
El escaneo real también depende del tamaño del código, la iluminación, la calidad de impresión y la cámara — no solo del contraste.
Abrir el generador de códigos QR →Ratio de contraste
21.00:1
Cómo funciona
- 1 Choose your QR foreground (dot) color.
- 2 Choose the background color.
- 3 Read the contrast ratio and verdict.
- 4 Adjust until it's comfortably readable, then generate your code.
Casos de uso comunes
- Validate brand colors before printing a QR.
- Avoid inverted (light-on-dark) codes that fail to scan.
- Compare a few color pairs quickly.
- Sanity-check a designer's QR palette.
Preguntas frecuentes
Are these static or dynamic QR codes?
Static. The content is encoded directly into the QR code and never changes — no redirect, no tracking and no account. Dynamic QR codes (editable destination, scan analytics) need a redirect service, which this tool does not offer, by design, for privacy.
Is my data uploaded?
No. Everything is generated entirely in your browser — your content is never uploaded, stored or logged.
What contrast ratio is safe?
Aim high. A ratio around 7:1 or more with dark dots on a light background is comfortable. Below ~3:1 is risky, and light-on-dark (inverted) codes often fail regardless of ratio.
Does good contrast guarantee a scan?
No. Contrast is necessary but not sufficient — size, the quiet-zone margin, lighting, print quality and the scanning camera all matter too.
Is it really free?
Yes — free, with no signup, no watermark and no limits.