CSS Specificity Calculator

Work out which selector wins, including the :is, :where and :not traps.

Free
No signup
Nothing uploaded
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Selector A

Selector B

Selector A wins. It applies even if the other one is written later in the file.

1,2,1

#navid → a

.itemclass → b

:hoverpseudo-class → b

aelement → c

0,2,4

.linkclass → b

.activeclass → b

navelement → c

ulelement → c

lielement → c

aelement → c

How the three columns are compared

Left to right, like version numbers. A single id beats any number of classes, and a single class beats any number of elements — 1,0,0 wins against 0,99,0. Only when a column ties does the next one matter.

a — ID
b — class, attribute, pseudo-class
c — element, pseudo-element

How to Use the CSS Specificity Calculator Online

Works out which selector wins, including the :is, :where and :not traps. :where always contributes zero specificity, :is and :not take the specificity of their most specific argument — which is why swapping one for the other silently changes which rule applies.

No software to install Free Works on any device

Step-by-Step Guide to Using the CSS Specificity Calculator

1

1. Type a selector into each box
2

2. The answer appears as you type

there is no button to press.
3

3. What it means is explained underneath, not just the number

Try it now

What is the CSS Specificity Calculator?

Why Use Web Development Tools in the Browser?

Small web jobs like minifying CSS, checking HTML, escaping a string or writing a Dockerfile rarely deserve a new install. These tools do each one in a tab, and your code is never sent to a server.

“The fastest tool is the one already open in a tab.”

Code checked for errors
Messy code made readable
Number bases converted
Selectors and paths tested

Minified files for faster pages
Config files from templates
CI workflows drafted quickly
Source code stays private

Popular Uses for Developer Utilities

These are the small tasks that interrupt a day of web work.

Minifying assets Shrink CSS or JSON before deploying, then beautify it again to read.
Validating markup Catch unclosed tags and syntax errors in HTML, CSS or JavaScript before publishing.
Docker setups Draft a Dockerfile, Docker Compose file or .dockerignore for a new project.
CI pipelines Generate a GitHub Actions or GitLab CI workflow and adjust it to fit.
Number conversions Convert between binary, decimal, hex and octal while reading low-level data.
Selector testing Try a CSS selector or JSONPath expression against sample input and see matches.
Data URIs Turn a small image into a data URI to embed directly in CSS.
Project files Create .gitignore, EditorConfig and CODEOWNERS files without copying them from old repos.

What You Can Do with the CSS Specificity Calculator

The calculation happens on your own machine, at your machine's speed

Reports the line and column of the first real error rather than a generic parse failure

Expressions are tested against your own document, so the result is the one you will get

Why Use ToolXkit for CSS Specificity Calculator?

Your files stay with you

Everything runs inside your browser. Nothing you open or type is uploaded to a server.

Web Dev Tools for Different Users

Front-end developers

Validate, minify and beautify HTML, CSS and JavaScript as part of daily work.

DevOps engineers

Draft Docker, cron and CI files quickly, then refine them in the repo.

Coding students

Learn number systems, escapes and selectors by trying examples and seeing results.

Technical writers

Escape code samples and check snippets before putting them into documentation.

QA testers

Write clear bug reports and test CSS selectors against real page markup.

Open source maintainers

Set up issue templates, CODEOWNERS and gitattributes for a shared project on GitHub.

Best Times to Validate or Minify Code

Keep these open in a tab when you are:

Starting a new repository
Preparing a site for launch
Tracking down a syntax error
Containerising an app
Setting up automated builds
Reading hex or binary values
Writing a bug report
Working on a locked-down laptop

Frequently Asked Questions

Answers to common questions about this tool.

Do I need to install anything to use the CSS Specificity Calculator?

No. CSS Specificity Calculator runs entirely in your browser — there is nothing to download, no extension and no desktop program. It works the same on Windows, macOS, Linux, Android and iPhone.

Is it safe to use the CSS Specificity Calculator online?

Safer than the usual alternative, yes. Most online tools upload your file to a server you know nothing about, where it sits until someone deletes it. Here the file never leaves your device — the processing happens in the page itself, so there is no server copy to leak, retain or sell.

Is my code sent to a server when I use CSS Specificity Calculator?

No. Your code is processed in the browser tab, so private repositories, keys in config files and client work stay on your machine. It also means the tool works on locked-down work laptops where installing software is not allowed.

Will minifying break my code?

Minifying removes spaces, comments and line breaks without changing what the code does. Keep an unminified copy for editing, and test the minified version before deploying it.

Are the generated config files ready to use?

They give you a sound starting point based on common settings. Every project is different, so read through the file and adjust paths, versions and secrets before committing it.

Is CSS Specificity Calculator free with no account?

Yes. There is no login, API key or usage cap. Open the page whenever you need it, even on a machine that is not your own.

Does CSS Specificity Calculator follow current web standards?

The validators and generators follow current web standards and common tool conventions. Standards keep moving, so for edge cases check MDN or the official specification listed in further reading.

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