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UI & Component Styling Tool

Free CSS Box Shadow Generator

Generate sleek, natural, and modern CSS box shadows with real-time blur, spread, offset sliders, inset depth controls, curated elevation presets, and instant CSS export.

Interactive Box
Horizontal Offset (X) 0px
Vertical Offset (Y) 12px
Blur Radius 30px
Spread Radius -4px
Shadow Opacity 15%
Workflow

How To Use Box Shadow Generator

1

Adjust Offsets & Blur

Move the horizontal (X) and vertical (Y) offsets, blur radius, and spread to achieve your desired light elevation.

2

Tune Opacity & Inset

Fine-tune shadow transparency percentage or toggle the Inset checkbox for depressed wells and input states.

3

Copy Cross-Browser CSS

Click Copy CSS to paste the ready-to-use cross-browser box-shadow property directly into your web projects.

FAQ

Frequently Asked Questions

Blur Radius softens and disperses the shadow outward from the element boundary (higher values make it blurrier and fainter). Spread Radius physically expands or contracts the size of the shadow shape before the blur is applied (negative values shrink the shadow under the card for a realistic floating effect).

In modern Stripe, Vercel, and Apple design systems, a negative spread radius (such as `-5px` with a `25px` blur) stops the shadow from bleeding unnaturally around the top corners, casting a natural downward shadow that mimics real sunlight.

The inset keyword casts the shadow inside the frame of the element instead of outside. It is commonly used for depressed buttons, active form inputs, sunken search bars, and skeuomorphic dials.

Standard box-shadows on static cards are GPU accelerated. However, animating massive blur radiuses (e.g. 100px+) on 60 FPS scroll events can trigger repaints. For optimal performance, keep blur radiuses below 50px on mobile viewports.
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