Free CSS Box Shadow Generator Online

What the CSS Box Shadow Generator Does

Getting a box shadow to look right by typing raw CSS values is a guessing game. You tweak a number, reload, squint at the result, and repeat. This tool replaces that cycle with a visual, slider-driven interface that updates a live preview instantly as you adjust every shadow property. Designers, front-end developers, and anyone building for the web can dial in the exact shadow they need and walk away with production-ready code.

The generator outputs both standard CSS and Tailwind CSS classes side by side, so you get the format your project actually uses. If your shadow happens to match a built-in Tailwind utility like shadow-md or shadow-lg, the tool recognizes it and gives you the class name directly. For everything else, it produces the correct arbitrary value syntax that Tailwind’s JIT compiler handles on the fly.

Your data never leaves your browser. The entire tool runs 100% client-side with JavaScript. There are no server calls, no accounts, no cookies, and no tracking of any kind. What you build stays on your machine.

How It Works

The interface is split into two panels. On the left, you have your shadow layer controls. On the right, a live preview and your copy-ready output.

1. Adjust the sliders. Each shadow layer gives you six controls: X Offset and Y Offset (both ranging from -50px to 50px) position the shadow relative to the element. Blur (0-100px) controls how soft the shadow edge is. Spread (-50px to 50px) expands or contracts the shadow size. A color picker with hex input lets you choose any shadow color, and an Opacity slider (0-100%) dials in transparency.

2. Toggle inset mode. Check the Inset checkbox on any layer to flip the shadow inside the element, creating a pressed or recessed appearance commonly used on input fields and toggle controls.

3. Add multiple layers. Click the + Add Layer button to stack up to 5 independent shadow layers on the same element. Each layer has its own full set of controls. Layered shadows are how modern UI frameworks achieve smooth, realistic depth effects that a single shadow cannot reproduce.

4. Start from a preset. The Presets section offers 10 curated starting points: Subtle, Card, Elevated, Heavy, Glow, Neon Glow, Inset, Sharp, Smooth Depth, and Pop Pink. Click any preset to load it into the editor, then customize the values to fit your design.

5. Preview in dark and light. The preview panel defaults to a dark background. Click the Light BG / Dark BG toggle to switch contexts. Shadows behave very differently against light versus dark surfaces, and this toggle lets you verify your shadow works in both without leaving the tool.

6. Copy your code. Below the preview, the CSS output block shows the complete box-shadow declaration with comma-separated layers. The Tailwind CSS block shows the equivalent class. Hit the Copy button on either block to send the value straight to your clipboard.

Why Use Our CSS Box Shadow Generator

• Dual output format. Most shadow generators stop at standard CSS. This tool gives you both CSS and Tailwind output, with automatic detection of built-in Tailwind utility matches.
• Multi-layer support. Stack up to 5 shadow layers with independent controls for each. Layered shadows create the kind of depth that single-shadow generators simply cannot produce.
• Dark and light preview toggle. A shadow that looks polished on a white card can vanish on a dark background. The built-in toggle catches that problem before it reaches production.
• 10 curated presets. Skip the blank-canvas start. Load a preset like Smooth Depth (a 4-layer progressive shadow) or Neon Glow (a 2-layer colored halo), then fine-tune from there.
• No signup, no limits, no tracking. Use it as many times as you want. There is no account wall, no usage cap, and no analytics watching what you build. Everything runs in your browser.

Use Cases

• Card and panel elevation. Floating cards, modals, and dropdown menus need shadows that communicate depth. Use the Card or Elevated presets as a starting point, then tweak blur and opacity to match your design system.
• Dark mode verification. If your project supports dark mode, you need shadows that hold up against both light and dark surfaces. The preview toggle lets you catch contrast failures before your users do.
• Glowing interactive states. Hover effects, focus rings, and active button states often use colored shadows. The Glow and Neon Glow presets produce vibrant halos that you can recolor to match any brand palette.
• Inset input fields. Form inputs and toggle switches commonly use inset shadows to create a sunken appearance. Toggle the Inset checkbox and adjust blur and opacity for a subtle pressed effect.
• Tailwind project integration. If you are building with Tailwind CSS, copying arbitrary shadow values from a standard generator and reformatting them into Tailwind syntax is tedious. This tool does the conversion automatically.
• Design system documentation. When establishing shadow tokens for a design system, use the layered controls to define each elevation level visually, then copy the exact CSS values into your token definitions.

Tips and Best Practices

• Layer shadows for realism. A single shadow with high blur looks flat. Two or three layers at different offsets and opacities create the kind of natural-looking depth that Material Design and modern UI libraries use. The Smooth Depth preset demonstrates this technique with four progressive layers.
• Keep opacity low. Shadows rarely need more than 10-25% opacity. High-opacity shadows look heavy and artificial. Start around 6-10% per layer and build up gradually by adding layers rather than cranking a single layer’s opacity.
• Test both backgrounds. Always check your shadow against the dark background before shipping. A shadow with a black color and 10% opacity is nearly invisible on a dark surface. For dark mode, consider switching to a lighter or colored shadow.
• Use negative spread for tighter shadows. A negative spread value pulls the shadow inward, making it smaller than the element. Combined with a vertical offset, this creates a tight, grounded shadow that sits close to the element rather than ballooning outward.
• Match Tailwind utilities when possible. If the Tailwind output shows a named class like shadow-lg instead of an arbitrary value, prefer the named class. Named utilities are more readable in your markup and easier to override with responsive or state variants.