CSS to SASS

What Is SASS Indented Syntax?

SASS indented syntax (.sass files) is the original whitespace-significant flavour of Sass — no curly braces, no semicolons. Structure comes from indentation, making files shorter and arguably cleaner than SCSS. It compiles to the same CSS as SCSS via Dart Sass, but is significantly less common in modern projects (~5% market share vs SCSS's ~95%).

CSS to SASS Converter Online — What This Tool Does

This free CSS to SASS converter parses flat CSS rules in your browser, groups related descendant selectors under their parent, uses the & parent reference for pseudo-classes and modifiers, and renders the result as indented SASS — stripping all braces and semicolons in the process.

How to Convert CSS to SASS Online

• Paste CSS into the Input pane, or click Upload to load a .css file.
• Choose an indent size (2 or 4 spaces).
• Click Convert — nested SASS appears in the Output pane.
• The badge shows Rules and Lines counts.
• Click Copy or Download to save as output.sass.

What Gets Transformed?

• Curly braces — removed; structure comes from indentation.
• Semicolons — removed from declarations.
• Descendant nesting — .header h1 becomes a child of .header.
• Pseudo / modifier nesting — .btn:hover, .btn.active become &:hover, &.active inside .btn.
• @media queries — preserved at the top level.
• Comments — stripped during parsing to keep output clean.

SASS vs SCSS — Which Should You Pick?

• Pick SCSS for new projects — overwhelming ecosystem support, looks like CSS, easier onboarding.
• Pick SASS only for legacy Compass / Ruby on Rails projects, or strong personal preference for terseness.
• The compiled CSS is identical — choice is purely syntactic.
• Indentation matters in SASS — inconsistent whitespace will break compilation; SCSS is more forgiving.

When to Convert CSS to SASS

• Legacy migration — porting an old plain-CSS project into a Compass / Ruby Sass codebase.
• Personal preference — you find indented syntax easier to scan than braced.
• Learning Sass — see how flat CSS maps to indented form to build intuition.
• Specific ecosystems — some Ruby on Rails templates and older static site generators expect .sass files.

Tips & Tricks

• Format your CSS first with the CSS Formatter for cleaner indentation output.
• Pick 2-space indent — the SASS convention; 4 spaces is rarer.
• Verify with SASS to CSS — compile back to confirm the conversion is lossless.
• Consider SCSS instead — use CSS to SCSS for the more popular Sass syntax.
• Indented syntax doesn't allow mixed line endings — convert to LF before committing if you're on Windows.

Related Tools

• SASS to CSS — reverse direction: compile indented SASS to plain CSS.
• CSS to SCSS — convert to braced SCSS instead (more popular).
• SCSS Formatter — work with SCSS, the more popular Sass syntax.
• CSS Formatter — clean up the source CSS before conversion.
• CSS Minifier — compress flat CSS for production.

Is My Code Sent to a Server?

No. All parsing and conversion run entirely in your browser using JavaScript. Your CSS — including any proprietary design tokens or brand colours — never leaves your machine.