CSS Minifier

Minify CSS by stripping comments and whitespace — see the size saving. Free, in your browser.

CSS

Strips comments and whitespace. Runs entirely in your browser.

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✓ Comment & whitespace removal
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About the CSS Minifier

A CSS minifier rewrites your stylesheet into the smallest functionally identical form by stripping everything a browser ignores. Paste your CSS and it removes comments, line breaks, indentation, and runs of whitespace, then drops characters that are technically optional: the final semicolon before a closing brace, trailing zeros, and spaces around colons, commas, and braces. The selectors, properties, and values stay exactly as written, so the rendered page looks the same. The point is fewer bytes over the wire and slightly faster parsing, since the browser no longer scans past comments and formatting that exist only to help humans read the code.

Reach for this when you are about to ship a stylesheet to production or paste critical CSS inline into your HTML. Hand-authored CSS, exported theme files, and snippets copied from documentation are usually full of generous spacing and explanatory comments that inflate the download. Minifying is also handy when a page-speed audit flags 'minify CSS', or when you want to inline a small stylesheet without bloating the document. Keep your original, readable file in version control and treat the minified output as a build artifact you regenerate, not something you edit by hand. Never try to maintain code in its minified state.

Minification is a syntactic transform, not compression. It understands just enough CSS structure to know which characters are safe to delete, which is why it preserves your rules byte-for-byte where it matters. That makes it complementary to gzip or Brotli, which your server applies on top: gzip finds repeated strings and replaces them with back-references, doing the heavy lifting on size, while minification cleans up the redundancy gzip cannot model and trims parse time. On a real stylesheet, minifying alone trims a modest slice, gzip a much larger one, and the two together beat either by itself. Run minify at build time; let the server handle compression at serve time.

This tool runs entirely in your browser. Your CSS is processed locally in JavaScript and is never uploaded to a server, so even proprietary or unreleased styles stay on your machine. One accuracy note: a safe minifier only touches whitespace and clearly optional characters, but aggressive optimizations elsewhere can change behavior, so always test the output. Watch for cases that depend on whitespace, such as content strings in pseudo-elements (content: " ") or carefully spaced custom property values, and confirm the page still renders correctly before deploying. When in doubt, diff the rendered result, not just the file size.

Frequently asked questions

What exactly does minifying CSS remove?

It removes comments, newlines, indentation, and redundant whitespace, plus optional characters like the last semicolon before a closing brace and spaces around colons, commas, and braces. Selectors, properties, and values are preserved, so the styles behave identically.

How much smaller will my CSS file get?

Whitespace-and-comment minification typically trims roughly 10-20% on its own, though heavily commented or generously formatted files can shrink more. The bulk of real-world size savings comes from pairing minification with server gzip or Brotli compression.

If my server already uses gzip, do I still need to minify?

Yes. Minification and gzip work differently and stack: gzip handles repeated strings at the byte level, while minification removes redundancy gzip cannot model and speeds up parsing. Combining both produces a smaller download than either alone, and minify is a cheap one-time build step.

Will minifying break my CSS or change how the page looks?

Safe minification only deletes ignorable characters, so the page should render identically. The rare exceptions are values that depend on whitespace, such as content strings in pseudo-elements, so test the output before deploying.

What about source maps for debugging minified CSS?

A source map is a separate .map file that links each position in the minified CSS back to your original source, letting browser DevTools show readable code. This simple paste-and-minify tool does not generate source maps; for that, use a build tool like a bundler or PostCSS in your pipeline.

From our blog

From One Color to a Whole Palette: A Practical Guide to Color Harmony

By the Super Simple Digital Tools Team · Updated June 2026

Picking colors feels like an art, but most pleasing palettes follow predictable geometry. Every hue can be placed on a 360-degree color wheel, and the relationships between positions are what make combinations look intentional. A palette generator automates this: you give it one color, it reads that color's position, and it returns the hues that sit at meaningful angles away. Understanding the handful of rules behind those angles means you can pick the right scheme on purpose instead of clicking randomize until something looks acceptable.

The core harmonies each have a job. Complementary pairs (180 degrees apart, such as blue and orange) create maximum contrast and energy, ideal for an accent or a button that must stand out. Analogous schemes (three to five neighboring hues within roughly 30 to 60 degrees) feel unified and natural, perfect for backgrounds and gradients. Triadic schemes space three colors evenly at 120 degrees for vivid balance, split-complementary softens a complementary pair by using the two colors flanking the opposite, and monochromatic stays on one hue while varying lightness for a clean, restrained look.

This is where HSL earns its place. Because hue, saturation, and lightness are separate dials, a generator can rotate the hue to find a complement while keeping saturation and lightness fixed, so the new color feels like it belongs to the same family. The same separation lets you build tints (add lightness) and shades (subtract lightness) of any swatch, giving you the lighter and darker variants you need for hover states, borders, and disabled elements. HEX codes hide this structure; HSL exposes it, which is why color tools think in HSL even when they output HEX.

A harmonious set of colors is a starting point, not a finished system. To turn swatches into a real palette, assign roles using the 60-30-10 split: choose a dominant color for the bulk of the surface, a secondary color for support and contrast, and one accent reserved for the few elements that must grab attention. Add a neutral or two (a near-black for text, an off-white for backgrounds) because almost no interface survives on saturated colors alone. Roles give your colors hierarchy, and hierarchy is what makes a layout readable.

Finally, test before you commit. The same hex value can look richer on an OLED phone than on a printed page, and warm office lighting shifts perceived color, so preview your palette in context rather than trusting the swatches in isolation. Most importantly, harmony does not guarantee legibility: run any text-on-background pairing through a contrast checker and aim for at least a 4.5:1 ratio for body text. A palette that is both harmonious and accessible is one you can ship with confidence.

Start from a brand or anchor color you already own, then generate complementary and analogous options around it so new colors stay on-brand.
Use a complementary pair for high-contrast accents (buttons, alerts) and an analogous set for calmer backgrounds and large fills.
Build tints and shades by changing only the lightness value in HSL, keeping hue and saturation fixed so the variants stay in the same family.
Apply the 60-30-10 split and add at least one neutral for text and one for background before calling the palette finished.

Read the full guide →

Tool by the Super Simple Digital Tools Team. Reviewed by our editorial team. Free to use, no signup required.