Free CSS Box-Shadow Generator — Visual Shadow Editor with Live Preview

CSS Box-Shadow Generator: How to Create Depth Without Guesswork

The `box-shadow` property has five separate values to juggle — horizontal offset, vertical offset, blur, spread, and color — and getting a shadow to look subtle rather than heavy-handed usually takes several rounds of trial and error in dev tools. A box-shadow generator turns that guesswork into a visual, immediate process.

This guide breaks down what each box-shadow value actually controls and how to build layered shadows visually before copying the CSS.

The Five Parts of a Box-Shadow

`box-shadow: 0px 10px 25px -5px rgba(13, 27, 62, 0.25);` looks dense, but each value has a specific job:

Blur vs Spread: The Two Most Confusing Values

Blur radius softens the shadow's edges — a larger blur makes the shadow fade out more gradually. Spread expands or shrinks the shadow's base size before that blur is applied. A common pattern for a soft, natural-looking card shadow is a large blur with a *negative* spread, which keeps the shadow contained rather than bleeding out from every edge of the element.

How to Build a Box-Shadow Online (Step by Step)

Using the ToolzGo CSS Box-Shadow Generator takes a few seconds:

• •Go to toolzgo.com/tools/design-tools/box-shadow-generator
• •Adjust X/Y offset, blur, spread, color, and opacity with sliders
• •Watch the live preview card update in real time
• •Click "Add Shadow" to stack multiple shadow layers for more realistic depth
• •Copy the generated CSS directly into your stylesheet

Why Stack Multiple Shadow Layers?

A single shadow often looks flat or artificial. Real-world lighting produces multiple overlapping shadows at different intensities — a sharp, subtle shadow close to the object, and a softer, larger shadow further out. CSS supports comma-separating multiple `box-shadow` values to combine several shadow layers on one element, which is how most polished card and button shadows in modern UI design are actually built.

Inset Shadows

Toggling the "inset" keyword flips a shadow from appearing outside the element's border to appearing inside it — useful for pressed-button effects, input field focus states, or subtle inner depth on cards.

Frequently Asked Questions

Q: What is the difference between blur and spread in box-shadow?

A: Blur radius softens and fades the shadow edges — larger values make it more diffuse. Spread expands or contracts the shadow's size before blurring is applied.

Q: Can I create an inset (inner) shadow?

A: Yes, toggle the "inset" option to create a shadow that appears inside the element's border instead of outside it.

Q: How do I stack multiple shadows in CSS?

A: Separate multiple shadow definitions with commas in the box-shadow property — this tool generates that comma-separated syntax automatically when you add layers.

Q: Does box-shadow affect page layout?

A: No — box-shadow is purely visual and doesn't take up space in the document flow, so it won't push other elements around.

Pair your shadow with the ToolzGo Border-Radius Generator to round the corners of the same element, or build a background gradient with the CSS Gradient Generator.

Design your box-shadow visually and copy the CSS.