Verificatore di Contrasto QR
Verifica se i colori del tuo QR sono leggibili.
Punti chiari su sfondo scuro potrebbero non scansionarsi. Usa punti scuri su sfondo chiaro.
La scansione reale dipende anche da dimensione del codice, illuminazione, qualità di stampa e fotocamera — non solo dal contrasto.
Apri il generatore di QR code →Rapporto di contrasto
21.00:1
Come funziona
- 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.
Casi d'uso comuni
- 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.
Domande frequenti
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.