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Discover 279+ fast, free, and accurate online calculators, converters, and developer utilities on FNCT.NET. Instant 0ms computation.
Convert RGB and RGBA color values to hexadecimal HEX codes with instant live color swatch preview.
Calculate color contrast ratios and verify WCAG 2.1 AA & AAA accessibility compliance.
Visual CSS box-shadow generator supporting multi-layer smooth elevation, inset shadows, custom RGBA colors, and 1-click Tailwind CSS copy.
Convert hexadecimal HEX color codes to CSS rgba(r, g, b, a) values with interactive transparency controls.
Generate custom, high-resolution QR codes with customizable colors, error correction levels, and SVG/PNG vector downloads.
Calculate display aspect ratios and scale image and video dimensions proportionally.
Interactive online CSS gradient generator for linear, radial, and conic backgrounds with instant Tailwind CSS class export.
Calculate fluid typography and responsive CSS clamp() formulas without media queries.