Design & UI Tools

Free online CSS and design tools are browser-based generators that produce ready-to-use CSS code for gradients, shadows, border radii, colour palettes, typography scales, and UI components. Instead of writing CSS values from memory or guessing what looks right, you adjust visual controls in a live editor and copy the exact code into your project.

These tools eliminate the trial-and-error cycle of writing CSS manually. A multi-stop gradient that might take 15 minutes of iteration in a stylesheet takes 30 seconds in a visual generator. A box shadow with multiple layers — spread, offset, blur, opacity — is immediately previewed on a sample element. You see what you get before you touch your code.

All generated CSS is standard, valid code that works in any modern browser. No libraries, frameworks, or plugins are required. The code belongs to you with no usage restrictions.

These tools are useful throughout the design and development workflow:

• During prototyping — Quickly generate gradient backgrounds, card shadows, and button styles to test visual directions without committing to precise values in your design system
• During development — Convert design tokens from Figma (hex colours, px dimensions) into correct CSS custom properties and clamp() values for responsive layouts
• During accessibility review — Check every foreground/background colour combination against WCAG 2.1 AA and AAA thresholds before launch
• During design system creation — Generate modular type scales, spacing systems, and colour palettes with mathematical precision
• During maintenance — Quickly regenerate or adjust a gradient or shadow when brand colours change, without spending time recalculating values

The CSS Gradient Generator is the most-used tool on this page. It supports both linear and radial gradients with multiple colour stops, and produces the correct background or background-image CSS syntax including fallbacks.

Features:

• Add up to 10 colour stops with precise position control
• Set gradient angle for linear gradients (0°–360°) or shape for radial gradients
• Preview on a realistic card element that updates in real time
• Generated CSS includes the linear-gradient() or radial-gradient() function ready to paste
• Hex, RGB, and HSL colour input modes
• Preset library for common gradient directions and styles

Gradients are used in modern UI design for hero backgrounds, button fills, card overlays, and divider effects. The generator makes it practical to iterate on colour combinations until you find one that matches your brand perfectly.

Colour contrast is one of the most common accessibility failures on the web. WCAG (Web Content Accessibility Guidelines) defines minimum contrast ratios to ensure text is readable for people with low vision or colour blindness.

The WCAG contrast thresholds:

• AA (minimum) — 4.5:1 for normal text, 3:1 for large text (18px+ regular or 14px+ bold)
• AAA (enhanced) — 7:1 for normal text, 4.5:1 for large text
• UI components and icons — 3:1 against adjacent colours

The Colour Contrast Checker calculates the luminance-based contrast ratio between any two hex, RGB, or HSL colours and shows which WCAG levels they pass or fail. It also suggests lighter or darker alternatives that do meet the threshold.

Running this check is important for any text on a coloured background: buttons, navigation labels, form placeholders, hero text over gradient backgrounds, and data visualisation labels. It is a legal requirement under WCAG 2.1 for public-sector websites in the EU and UK, and strongly recommended for all web content.

The CSS clamp() function creates values that scale proportionally with the viewport between a minimum and maximum — without media queries. It is the modern approach to fluid typography and responsive spacing.

The syntax is: clamp(minimum, preferred, maximum). For example:

• font-size: clamp(1rem, 2.5vw, 1.5rem) — Scales from 16px on mobile to 24px on large screens
• padding: clamp(1rem, 5%, 3rem) — Scales from 16px to 48px as the container grows

Calculating the correct clamp() values manually involves solving linear equations for the viewport range you want. The CSS Clamp Calculator takes your minimum viewport width, maximum viewport width, minimum size, and maximum size as inputs, then outputs the complete clamp() expression — ready to paste.

This is especially valuable for design systems where you want every type size and spacing token to scale smoothly from mobile to desktop without a separate set of media query breakpoints for each value.

Glassmorphism and neumorphism are two distinctive visual design styles that are popular in modern UI design but require precise CSS values that are tedious to write by hand.

Glassmorphism creates the frosted-glass panel effect seen in iOS and macOS interfaces. The key CSS properties are backdrop-filter: blur() for the frosted blur, a semi-transparent background colour, and a subtle border. The Glassmorphism Generator lets you control:

• Blur radius (the intensity of the frosted effect)
• Background opacity (how transparent the panel is)
• Border opacity and width
• Background colour tint

Neumorphism (soft UI) creates extruded or inset elements that appear to be pushed through the background surface. It uses two carefully chosen box shadows — one lighter and one darker than the background — to simulate a light source. The Neumorphism Generator calculates these shadow values automatically from your chosen background colour and light source direction.

Both generators produce complete, copy-ready CSS and include a live preview on a sample element so you can see the effect before using it in your project.

If you’re building a UI or design system, these tools are commonly used together:

• CSS Gradient Generator — multi-stop gradients with live preview
• Box Shadow Generator — layered shadows for cards and buttons
• Color Contrast Checker — WCAG AA/AAA checks
• CSS Clamp Calculator — fluid typography without media queries
• SVG to JSX Converter — convert icons to React components