Color, typography, and layout calculators for designers.

Designers need precise technical calculations for color accessibility, responsive layouts, typography scaling, and print specifications. SpecWhale's design toolkit covers WCAG contrast checking, pixel-to-rem conversion, PPI and DPI calculation, and aspect ratio management — all in a distraction-free interface.

Featured Tools for UI & Graphic Designers

Zero-upload, 100% private client-side calculators and converters.

Color Contrast Checker

Check WCAG contrast ratio between two hex colors.

Developer Tools · Text/code

Aspect Ratio Calculator

Reduce an image or screen resolution to its simplest aspect ratio.

Specs & Media · Calculator

px To rem Converter

Convert px to rem instantly with formula and quick reference.

Converters · Converter

PPI Calculator

Calculate screen pixel density from resolution and diagonal size.

Specs & Media · Calculator

SVG To PNG Converter

Convert pasted SVG markup into a PNG image locally.

File & Image Tools · File/image

CSS Px Rem Em Converter

Convert CSS pixels, rem, em, points, and percentages.

Specs & Media · Converter