Does this replace stylelint?

No. It’s a quick client-side syntax check.

Do you send CSS anywhere?

No. Parsing happens in your browser.

format validator

CSS Validator (light)

Parse CSS with css-tree locally to catch syntax errors, unbalanced braces, and malformed declarations.

Results

Processing…

Status: Processing...
Details: Processing...

How to use this validator

Paste your CSS snippet.
Run validate to parse selectors/properties.
Fix missing colons/braces or malformed values, then re-validate.

Rules & checks

Uses css-tree parser locally (no uploads).

Surfaces the first syntax error message from the parser.

Great for quick linting before commits.

Inputs explained

CSS
Paste small CSS snippets (selectors, rules). Keep payload modest for quick linting.

When to use it

Sanity-check inline styles or email templates
Validate theme overrides before deploying
Catch stray braces in CMS or WYSIWYG exports

Common errors

Missing colon between property and value
Unclosed braces
Properties without values or missing semicolons

Limitations

Syntax-focused; does not check browser compatibility or specificity.
Not a full spec validator; use your build pipeline for deep linting.

Tips

Run a full linter (stylelint) in CI for large codebases
Keep declarations terminated with semicolons to avoid parser errors

Examples

Valid

body { color: red; } -> Valid

Unbalanced

body { color: red; -> Flags unbalanced brace

Invalid declaration

p { font-weight } -> Flags missing value

Deep dive

This CSS validator uses css-tree client-side to catch missing colons, unclosed braces, and malformed declarations without uploading your styles.

Use it to lint snippets from CMS, emails, or theming tools before they ship.

FAQs

Does this replace stylelint?: No. It’s a quick client-side syntax check.
Do you send CSS anywhere?: No. Parsing happens in your browser.

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