WCAG Contrast Checker
Testo normale (16px)
Testo Grande (24px Bold)
The quick brown fox jumps over the lazy dog
Rapporto di contrasto
17.06:1
Eccellente
Conformità WCAG
Domande Frequenti
Tutto quello che devi sapere sull'accessibilità e il contrasto WCAG
Cos'è il contrasto WCAG?
Le linee guida WCAG (Web Content Accessibility Guidelines) definiscono standard di contrasto per garantire che il testo sia leggibile per persone con disabilità visive. Il contrasto è calcolato come rapporto tra la luminanza del colore più chiaro e quello più scuro, con un range da 1:1 (nessun contrasto) a 21:1 (bianco su nero).
Qual è il rapporto di contrasto minimo richiesto?
WCAG 2.1 Livello AA richiede: 4.5:1 per testo normale, 3:1 per testo grande (≥18pt o ≥14pt grassetto) e componenti UI. Livello AAA richiede: 7:1 per testo normale, 4.5:1 per testo grande.
Come migliorare il contrasto?
Per aumentare il contrasto: scurisci il testo (usa nero o grigio scuro invece di grigio chiaro), schiarisci o scurisci lo sfondo, evita colori simili in valore di luminosità. Strumenti come WCAG Contrast Checker o le DevTools del browser possono indicare aree problematiche.
What contrast ratio do the WCAG require?
Level AA asks for 4.5:1 on normal text and 3:1 on large text and interface components. Level AAA rises to 7:1 on normal text and 4.5:1 on large text.
How is the contrast ratio between two colors worked out?
The contrast ratio comes from the relative luminance of the two colors: lighter luminance plus 0.05, divided by darker luminance plus 0.05. Values run from 1:1 to 21:1, which is black on white.
When do the WCAG count text as large?
The WCAG count text as large from 18pt upwards, or from 14pt when bold. Large text only needs a ratio of 3:1 for level AA, against the 4.5:1 asked of normal text.
Does my data stay private?
Yes, and not because we promise it: this tool runs entirely inside your browser. What you type or upload never leaves your device, so it never reaches a server of ours and there is nothing we could keep, read or lose. You can check it yourself: open the page, disconnect from the internet, and the tool keeps working.
Do you store what I enter?
No. There is no database behind this tool: we do not store your files, your text or your results. When you close the tab nothing is left — not here with us, because it never arrived, and not anywhere else.
Do you profile me? Are you GDPR compliant?
We do not profile you: there is no account to create, we never ask for your email to use a tool, and we keep no profile of what you do. We are an Italian company and we work under the GDPR and the other European rules, with the privacy notice and the consent request in plain sight. One thing we say in full rather than hiding it behind a slogan: the ads on the page are Google's, and Google may use cookies to personalise them. You decide from the consent banner: if you say no the ads stay, but they are not personalised, and the tool works exactly the same.
If it is free, how do you make money?
From the ads on the page, and that is all. We do not sell your data, there is no hidden paid plan, there is no limit that eventually asks for your card, and you do not have to sign up. The ads pay for the servers and for the time we spend writing the tools: that is how we can keep them open to everyone.