Add valid CSS
Paste your stylesheet or open a local .css file. Comments, custom properties, keyframes, and nested at-rules are retained.
Structured stylesheet converter
CSS to LESS Converter
Transform valid CSS into cleaner, maintainable LESS. Group related selectors into nested blocks while preserving declarations, comments, keyframes, media queries, and modern at-rules.
- Smart selector nesting
- Private browser processing
- Copy or download LESS
CSS input
Converted LESS0 bytes
How to convert CSS to LESS
Restructure a standard stylesheet into organized LESS in three quick steps.
Choose nesting
Enable safe nesting to combine related selectors such as component states and child elements under a shared parent.
Export the LESS
Review the clean result, copy it to your project, or download a ready-to-edit .less stylesheet.
Purpose-built for reliable stylesheet migration
Conversion focuses on structure and readability without inventing risky abstractions.
Safe nesting
State selectors and descendants are nested only when a clear parent relationship exists.
At-rule support
Media queries, supports rules, container queries, font faces, and keyframes remain organized.
Readable output
Consistent indentation creates LESS that is easy to audit, maintain, and extend with variables or mixins.
Local conversion
Your code is parsed in the current browser tab and is never submitted to a conversion server.
What changes during CSS to LESS conversion?
Valid CSS is already valid LESS, but a useful migration should improve its structure. This converter identifies selectors with a clear shared parent and nests their state, pseudo-element, child, and modifier rules using LESS's & syntax.
Conservative by design
Automatically guessing variables or mixins can change meaning and create confusing abstractions. The converter preserves declaration values exactly and leaves design-token decisions to you.
Review before production
Complex selector lists can express relationships that should not be combined. The converter keeps ambiguous selectors at the root level, but you should still compile and test the result in your own build workflow.
/* CSS */ .button { padding: 12px 20px; } .button:hover { color: white; } .button .icon { margin-right: 8px; } /* LESS */ .button { padding: 12px 20px; &:hover { color: white; } .icon { margin-right: 8px; } }
CSS to LESS converter FAQs
Important details about nesting, compatibility, and output.
Is regular CSS valid LESS?
Yes. LESS is compatible with standard CSS, so even unnested CSS can be saved as a .less file. This converter additionally organizes related selectors when safe nesting is enabled.
Does the converter create LESS variables automatically?
No. It preserves values exactly because automatically deciding which colors, spacing values, or fonts should become shared variables can change the intended architecture.
How does smart selector nesting work?
The converter finds a simple parent selector and nests clear pseudo-classes, pseudo-elements, modifiers, and descendant selectors beneath it. Ambiguous groups remain separate.
Are media queries and keyframes preserved?
Yes. At-rules and their contents are retained. Style rules inside media, supports, layer, and container blocks are processed independently.
Is my CSS uploaded anywhere?
No. Reading, parsing, restructuring, copying, and downloading all happen inside your browser.
Why did some selectors stay unnested?
The relationship may be ambiguous, use a selector list, or have no matching parent block. Keeping those rules separate avoids producing misleading LESS.
Can I disable selector nesting?
Yes. Clear the nesting option to format the CSS as LESS-compatible code without restructuring selector relationships.
Should I test the generated LESS?
Yes. Compile it with your project's LESS version and run a visual or regression check before replacing a production stylesheet.