Free CSS Box Shadow Generator
Updated September 2026
Generate CSS box shadows visually with X/Y offset, blur, spread, color, and inset controls. Copy production-ready CSS code — free online tool.
Developers need fast, accurate utilities that slot into their workflow without friction. The CSS Box Shadow Generator provides exactly that — no installation, no account, no context-switching.
Generate CSS box shadows visually with X/Y offset, blur, spread, color, and inset controls. Copy production-ready CSS code — free online tool. Results are immediate — no waiting, no loading screens, no account required.
Who uses the CSS Box Shadow Generator?
- UI developers generating card and button shadows that match their design system specs.
- CSS learners exploring shadow properties through a visual, instant-feedback interface.
- Designers creating and testing shadow effects for mockups before handing off to developers.
Common uses and search terms
The CSS Box Shadow Generator is frequently used for: css, shadow, design, box-shadow. Whether you need a quick result or are working through a longer project, the tool handles all common variations without any configuration.
Accepted input formats
The CSS Box Shadow Generator accepts any standard input for this utility type. Minified, pretty-printed, and partially-formatted inputs are all handled — the tool normalises whitespace and encoding before processing. Unicode strings, multi-byte characters, special symbols, and multi-line blocks are fully supported. Very large inputs (several megabytes) may take a few extra seconds on lower-powered devices; closing unused browser tabs can free up memory for better performance. Output follows the same format conventions used by standard command-line tools and IDE extensions for this operation type.
Why use Allio Tools's CSS Box Shadow Generator?
Your code and data stay entirely in your browser — nothing is logged, stored, or transmitted. The tool is completely free with no usage limits, no premium tiers, and no account required. Available in 11 languages and optimised for all screen sizes, the CSS Box Shadow Generator works on desktop, tablet, and mobile with no app download needed.
See also:JSON Formatter · Base64 Encoder/Decoder · Regex Tester
How the CSS Box Shadow Generator works
Adjust the X offset, Y offset, Blur radius, and Spread radius sliders to shape your shadow.
Click the color swatch to choose a shadow color, and use the opacity slider next to it.
Toggle Inset for an inner shadow effect.
Copy the CSS from the code output panel.
Tips & tricks
- This tool outputs a single shadow layer — for a multi-layer effect (like Material Design elevation), generate each layer here separately and combine them with commas by hand.
- Negative spread with a larger blur creates a soft, diffuse shadow that reads as more "floating" than a tight positive-spread shadow.
- Inset shadows work well for pressed-button states — try a small blur with a dark, low-opacity color.
- The opacity slider controls the shadow color's alpha channel, not the element's own opacity.
Frequently Asked Questions
What is the CSS box-shadow syntax?
box-shadow: [inset] X-offset Y-offset blur-radius spread-radius color. Example: box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -2px rgba(0, 0, 0, 0.1). Multiple shadows are comma-separated.
What does the spread radius do?
Spread radius expands or contracts the shadow before blurring. Positive values grow the shadow larger than the element; negative values shrink it. A spread of -4px with blur of 8px creates a focused, directional shadow.
What is an inset shadow?
Checking the Inset box makes the shadow appear inside the element border rather than outside. Inner shadows create pressed/depressed button states, inset card effects, and inner glows.
Can this tool generate multiple stacked shadow layers, like Material Design elevation?
No — this tool generates one shadow layer at a time. For a layered effect like Material Design elevation (box-shadow: 0 2px 4px -1px rgba(0,0,0,0.2), 0 4px 5px 0px rgba(0,0,0,0.14), 0 1px 10px 0px rgba(0,0,0,0.12)), generate each layer separately here and combine the comma-separated values by hand.
Does box-shadow affect layout and take up space?
No. Unlike margin or padding, box-shadow does not affect layout — elements with shadows don't push adjacent elements away. This makes shadows safe to add without disrupting page layout.
Is my data safe when using the CSS Box Shadow Generator?
Completely safe. The CSS Box Shadow Generator processes everything locally in your browser. No input data, results, or usage information is ever transmitted to or stored on any server.
Can I use the CSS Box Shadow Generator output in commercial projects?
Yes. The CSS Box Shadow Generator is a utility tool and its output carries no licensing restrictions. You are free to use results in any project, commercial or personal.
Does the CSS Box Shadow Generator follow official standards?
Yes. The CSS Box Shadow Generator is built to comply with the relevant industry standard or specification for this utility type. If you encounter an unexpected result, verify your input against the specification — edge cases outside the standard may produce undefined behaviour.
Works with ChatGPT, Claude, Cursor, GitHub Copilot, VS Code, Poe and more — 106+ tools, zero data collection.