SASS to CSS

What Is SASS Indented Syntax?

SASS originally referred to an indented syntax (.sass files) that uses whitespace instead of curly braces and semicolons. It predates SCSS and remains the terser, Ruby-influenced flavour of Sass. Browsers can't read SASS directly — it must be compiled to plain CSS before deployment, just like SCSS.

SASS to CSS Converter Online — What This Tool Does

This free SASS to CSS converter compiles indented .sass source files to plain CSS in your browser using the official Dart Sass compiler. Parses the indentation structure, substitutes $variables, expands nesting, resolves & parent references, and bubbles @media queries to the top level.

SASS vs SCSS — What's the Difference?

• SASS (indented) — no { } or ;; structure comes from indentation. Terser, but stricter about whitespace.
• SCSS (Sassy CSS) — uses { } and ;; a strict superset of CSS. More popular by a wide margin (~95% of modern Sass projects use SCSS).
• Compiled output is identical — both syntaxes produce the same CSS via Dart Sass.
• When to pick SASS — legacy Compass / Ruby on Rails projects, or strong personal preference for terseness.

How to Convert SASS to CSS Online

• Paste your SASS (indented) code into the Input pane, or click Upload to load a .sass file.
• Click Convert — Dart Sass compiles in milliseconds.
• The size badge shows Original (SASS) and Compiled (CSS) byte counts.
• Click Copy or Download to save as output.css.

Supported SASS Features

This tool uses the real Dart Sass compiler, so every SASS feature works:

• $variables — declared and substituted throughout.
• Indented nesting — child rules nest by indentation level.
• & parent reference — &:hover, &--modifier for BEM.
• @mixin / @include — reusable blocks with arguments.
• @extend / %placeholders — selector inheritance.
• @function / @return — custom functions.
• @each / @for / @while / @if — all control-flow directives.
• @media bubbling — nested media queries hoisted to top level.
• Math and colour functions — all built-in Sass modules.

When to Convert SASS to CSS

• Legacy Ruby / Compass projects — compile .sass files without setting up the original Ruby toolchain.
• Migrating away from SASS — convert to CSS as an intermediate step before adopting SCSS or a modern build pipeline.
• Code review — see the exact CSS your indented Sass generates.
• Static site builds — quick one-off compilation without npm install.

Tips & Tricks

• Indentation must be consistent — mixing tabs and spaces will break the parser. Stick to one or the other.
• No trailing colons — SASS uses property: value, just like SCSS, but no trailing ;.
• Consider migrating to SCSS — the ecosystem is overwhelmingly SCSS-first; use SASS to SCSS or convert via CSS → SCSS.
• Compile then minify — pair with CSS Minifier for production.
• Source maps — this tool doesn't generate them; use a Vite or Webpack pipeline if you need DevTools to show original SASS.

Related Tools

• CSS to SASS — reverse direction: convert flat CSS to indented SASS.
• SCSS to CSS — compile the braced SCSS syntax instead.
• CSS Formatter — beautify the compiled CSS output.
• CSS Minifier — compress compiled CSS for production.
• SCSS Formatter — work with SCSS, the more popular Sass syntax.

Is My Code Sent to a Server?

No. The Dart Sass compiler runs entirely in your browser via WebAssembly. Your SASS source — including proprietary design tokens and brand colours — never leaves your machine.