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Utilities
WCAG Contrast Checker
Check the contrast between text and background colors per WCAG 2.1 guidelines. Shows the ratio and AA/AAA levels for normal and large text.
Normal size text (16px)
Large text (24px bold)
Small text (12px)
Contrast ratio
maximum 21:1 (black on white)
Understanding WCAG
The Web Content Accessibility Guidelines (WCAG 2.1) set the minimum contrast a piece of content needs so that people with low vision can read it.
- • AA — Normal text: ratio ≥ 4.5:1
- • AA — Large text (≥18pt or ≥14pt bold): ratio ≥ 3:1
- • AAA — Normal text: ratio ≥ 7:1
- • AAA — Large text: ratio ≥ 4.5:1
Related Tools
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CNAB File Reader
Read Brazilian CNAB 240 and CNAB 400 banking files and display records decomposed by type.
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GEDCOM Reader
Read GEDCOM (genealogy) files and list individuals (INDI) with name, birth and death dates.
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PDF Merge
Merge several PDFs into a single file in the given order. Everything in your browser via pdf-lib.