CSS Box Shadow Generator

Settings

X Offset (px)

4px

Y Offset (px)

8px

Blur (px)

16px

Spread (px)

0px

Shadow Color

15%

Inset Inset shadow

Presets

Preview

Preview Box

CSS Code

box-shadow: 4px 8px 16px 0 rgba(0,0,0,0.15);

it lets developers and designers visually create CSS box-shadow effects by adjusting parameters in real time, then copying the generated code directly into their projects — no manual calculation needed.

How to Use the CSS Box Shadow Generator

Step-by-step walkthrough of the tool's interface:

Set X and Y Offset — Drag the horizontal and vertical offset sliders to position the shadow relative to the element. Positive X moves the shadow right; negative moves it left. Positive Y moves it down; negative moves it up.
Adjust Blur Radius — Higher blur values produce softer, more diffused shadows. A blur of 0 gives a sharp, hard-edged shadow.
Control Spread Radius — Spread expands or contracts the shadow beyond the element's dimensions. Positive values make the shadow larger; negative values shrink it.
Choose Shadow Color and Opacity — Pick any color with the color picker and use the opacity slider to control transparency. Semi-transparent shadows (e.g. rgba with low alpha) look more natural on most backgrounds.
Toggle Inset Shadow — Check the "Inset" option to flip the shadow inside the element, creating a pressed or embossed effect.
Apply a Preset — Click any of the ready-made presets for instant classic shadow styles.
Copy the CSS Code — Hit "Copy" to copy the generated box-shadow declaration to your clipboard.

Understanding the CSS box-shadow Property

A technical explainer covering the full syntax:

box-shadow: [inset] offset-x offset-y [blur] [spread] color;

Parameters explained:

offset-x — Horizontal distance of the shadow from the element.
offset-y — Vertical distance of the shadow from the element.
blur-radius — The softness of the shadow edges. Zero means sharp.
spread-radius — Controls how much the shadow expands or shrinks.
color — Any valid CSS color (HEX, RGB, RGBA, HSL). RGBA is recommended because it allows opacity control in a single value.
inset — Optional keyword that reverses the shadow direction, placing it inside the element's border.

Box Shadow Presets — When to Use Each Style

Description and use-case for each of the 6 built-in presets:

Preset	Style	Best For
Subtle lift	0 1px 3px, 10% opacity	Small UI elements, tags, chips
Light card shadow	0 4px 6px, 10% opacity	Card components, modals
Medium depth	0 10px 25px, 15% opacity	Hero sections, feature cards
Deep elevation	0 20px 40px, 20% opacity	Dropdowns, floating panels
Hard color shadow	4px 4px 0px blue	Retro/brutalist UI style
Inset glow	Inset 0 0 20px dark blue	Active inputs, focused states

Outer Shadow vs. Inset Shadow — What's the Difference?

Explain the visual and functional distinction between a standard (outer) box shadow and an inset shadow:

Outer shadow creates the illusion that an element is raised above the page surface — ideal for cards, buttons, and containers.
Inset shadow makes an element appear sunken or pressed into the page — commonly used for active button states, text input fields, and wells.

Tips for Natural-Looking CSS Box Shadows

Practical design advice:

Use RGBA colors with low opacity (0.10–0.20) rather than fully opaque colors.
Match shadow direction consistently across a page (typically downward and slightly right, simulating a top-left light source).
Layer multiple shadows for more realistic depth (soft wide shadow + tight dark shadow).
Avoid overly large blur values on small elements — they look disproportionate.
Colored shadows (e.g. blue glow on a blue button) are a modern design technique for brand-consistent depth.

CSS Box Shadow vs. filter: drop-shadow() — Key Differences

A comparison table or short explanation:

box-shadow respects the element's rectangular bounding box regardless of transparency.
drop-shadow() follows the actual visible shape of an element (including transparent PNGs).
box-shadow supports inset; drop-shadow() does not.
box-shadow supports multiple stacked layers; drop-shadow() does not.

Browser Support and Cross-Browser Compatibility

Note that box-shadow is fully supported in all modern browsers (Chrome, Firefox, Safari, Edge, Opera) and has been since IE9. The -webkit- and -moz- prefixes are no longer needed for modern projects, though they can be included for legacy support.

Common Use Cases for CSS Box Shadows

Real-world design scenarios:

Card UI components — Elevating cards above a page background.
Navigation bars — Adding a bottom shadow to create header depth.
Buttons — Simulating a 3D press effect on hover/active states.
Modals and dialogs — Separating overlays from the background.
Form inputs — Focus-state inset glow for accessibility and UX.
Images — Framing photos or thumbnails with a subtle shadow border.
Tooltips — Floating micro-UI elements with a subtle drop shadow.

Frequently Asked Questions

What is a CSS box shadow generator?

A CSS box shadow generator is an online tool that lets you visually adjust shadow parameters — offset, blur, spread, color, and opacity — and instantly produces the ready-to-use box-shadow CSS declaration you can paste directly into your stylesheet.

Is this CSS box shadow generator free to use?

Yes, the tool is completely free. There is no registration, download, or payment required. Simply adjust the sliders, preview the result live, and copy your CSS code.

How do I copy the CSS code from the box shadow generator?

After configuring your shadow settings, the generated box-shadow property appears in the CSS output field at the bottom of the tool. Click the "Copy" button to copy it to your clipboard and paste it into your CSS file.

What does the "Inset" option do in the CSS box shadow generator?

Enabling "Inset" applies the shadow inside the element's border rather than outside it. This is commonly used to create a sunken or pressed effect on buttons and input fields.

Can I create a colored glow effect with this box shadow generator?

Yes. Simply choose a vivid color from the color picker (for example, blue or purple) and use a moderate blur with a spread value of 0. Colored shadows are popular for creating neon glow or brand-colored elevation effects.

What does the "Spread" slider control in CSS box shadow?

The spread radius expands or shrinks the shadow relative to the element's size. A positive spread makes the shadow larger than the element; a negative value makes it smaller, which is useful for creating a tight, realistic depth effect.

Can I use multiple box shadows on one element?

Yes, CSS supports multiple box shadows on a single element by separating values with a comma, for example: box-shadow: 0 2px 4px rgba(0,0,0,0.1), 0 8px 24px rgba(0,0,0,0.15);. Layering a tight dark shadow with a wide soft shadow creates a highly realistic depth effect.

What is the difference between blur and spread in the box shadow CSS generator?

Blur controls how soft or diffused the edges of the shadow appear. Spread controls the overall size of the shadow relative to the element. You can have a large soft shadow (high blur, zero spread) or a hard expanded shadow (zero blur, positive spread).

What color format should I use for CSS box shadows?

RGBA is the most flexible format because it combines color and opacity in one value, for example rgba(0,0,0,0.15). HEX colors can also be used but require a separate opacity property or the newer 8-digit HEX format. The generator handles all of this automatically.

Does the CSS box-shadow property work on all browsers?

Yes. The box-shadow property is fully supported in all modern browsers including Chrome, Firefox, Safari, Edge, and Opera. No vendor prefixes (-webkit-, -moz-) are needed for modern projects.