WebUtilsLab CSS Tools

Free Local-First CSS Tools

Generate visual CSS values and accessibility checks directly in the browser with copy-ready output. Built for frontend developers who need quick CSS values, preview states, and accessibility checks without opening a design suite.

CSS tools

CSS

Box Shadow Generator

Design layered CSS shadows with live preview, presets, color controls, and copy-ready CSS output.

Live preview and presets
CSS, Tailwind, and variable output

Open Box Shadow

CSS

Color Contrast Checker

Check foreground and background colors against WCAG contrast thresholds with live preview and copy-ready CSS.

WCAG AA and AAA results
Live preview and CSS output

Open Color Contrast

Recommended CSS workflow

Best starting tool: CSS Box Shadow Generator — Start here when you need box-shadow values with live preview and copy-ready CSS.

Common workflow path: CSS Box Shadow Generator Color Contrast Checker

Common problem solved: Create copy-ready visual CSS values, then check contrast-sensitive colors before moving the result into a component or design token.

Start with the CSS Box Shadow Generator when you need box-shadow values with live preview and copy-ready CSS.
Use Color Contrast Checker before shipping text and interface colors that need WCAG AA or AAA confidence.
Use Box Shadow Generator when a component needs layered elevation, inset shadows, or Tailwind-style shadow values.
Keep CSS values copy-ready and move implementation details into your design system or component code.

Related categories

Move between related WebUtilsLab tool categories when a task crosses formats, encoding, scheduling, or implementation checks.

Developer Utilities Data Encoding

When to use these CSS tools

Component polish

Generate shadows and contrast-safe colors while building cards, modals, buttons, inputs, and dashboard surfaces.

Accessibility checks

Check WCAG contrast before shipping text, labels, status badges, and interface states.

Implementation handoff

Copy CSS values into a design system, component token, Tailwind class, or inline prototype without opening a heavy design tool.

CSS tools FAQ

Do CSS tools need an account?

No. CSS tools are free browser pages with no signup requirement.

Can Color Contrast Checker replace a full accessibility audit?

No. It checks color contrast ratios, but full accessibility also needs keyboard, semantic, screen reader, and interaction review.

Why keep CSS tools in a developer utility site?

Frontend developers often need quick copy-ready CSS values while debugging or building components.