CSS, JS & HTML Minifier
Minify CSS, JavaScript, and HTML in your browser to cut file size.
Best for
- Shrinking a CSS or JS file before deploying it to production for faster page loads.
- Cleaning up HTML markup exported from a design tool or CMS.
- Checking how much a stylesheet or script could shrink before wiring it into a build pipeline.
What each mode does
- CSS: removes comments and whitespace, and folds redundant rules using csso.
- JavaScript: removes comments and whitespace and renames local variables using Terser, the same minifier used by most modern build tools.
- HTML: strips comments and collapses whitespace between tags, without touching <pre>, <script>, <style>, or <textarea> content.
Privacy
- All three minifiers run entirely in your browser — your code is never uploaded to a server.
- JavaScript minification renames local variables for size, not obfuscation — don't rely on it to hide logic.
- Always test minified output before shipping it, especially for JavaScript with unusual syntax.
How to use
- Choose a tab
Pick CSS, JavaScript, or HTML.
- Paste your code
Or load the sample to see how it works.
- Minify and copy
Click Minify, review the size reduction, then copy the output.
Why ToolerWork?
Minification runs instantly in your browser.
Your code never leaves your device.
No signup or account required.
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View AllAbout this tool
Code Minifier
Minify CSS, JavaScript, or HTML in the browser to reduce file size, using csso for CSS and Terser for JavaScript.
Smaller CSS and JavaScript files load faster, and this tool minifies all three of the web's core languages from one page. CSS is minified with csso, JavaScript is minified with Terser — the same minifier used by most modern build tools, which also renames local variables for extra size savings — and HTML is minified by stripping comments and collapsing whitespace between tags, while leaving the contents of <pre>, <script>, <style>, and <textarea> untouched so nothing inside them breaks. A size comparison shows exactly how much smaller the output is.
How to use this tool
- Choose a tab: CSS, JavaScript, or HTML.
- Paste your code, or load the sample to see how it works.
- Click Minify and review the size reduction.
- Copy the minified output.
Why users choose this tool
- Focused workflow for shrinking a stylesheet or script before deploying it, or cleaning up exported HTML.
- Speeds up repetitive data and formatting tasks.
- Reduces manual errors in debug and validation workflows.
- Copy-ready output for immediate development use.
- Reliable minified code with comments and unnecessary whitespace removed generation with fewer manual steps.
Common use cases
- Shrink a CSS or JS file before deploying it to production for faster page loads.
- Clean up HTML markup exported from a design tool or CMS.
- Check how much a stylesheet or script could shrink before wiring it into a build pipeline.
When to choose this tool
JavaScript minification is the most involved of the three — Terser actually parses the code into an AST, so it's safe even for complex scripts. CSS and HTML minification here focus on removing comments and collapsing whitespace, which covers the bulk of the size savings for those two languages.
Privacy-first: Where browser-based processing is available, your files stay on your device. No file is uploaded to our servers unless strictly required for the tool to function.
Frequently asked questions
Does the JavaScript minifier work on any valid JavaScript?
Terser parses real JavaScript syntax, so it handles modern JS correctly. If your code has a syntax error, minification will fail with a message instead of producing broken output.
Will minifying my HTML break inline scripts or styles?
No. Content inside <pre>, <script>, <style>, and <textarea> tags is left untouched — only whitespace between other tags and HTML comments are removed.
Is this the same as obfuscation?
No. Variable renaming in the JavaScript minifier is for size, not for hiding logic — minified code is still readable with a formatter and isn't a substitute for real code protection.
Is my code uploaded to a server?
No. All three minifiers run entirely in your browser.
What is Code Minifier used for?
Code Minifier is used for shrinking a stylesheet or script before deploying it, or cleaning up exported HTML with a direct browser workflow.
What input does Code Minifier accept?
Code Minifier works with CSS, JavaScript, or HTML source code according to the selected mode and settings.
What output will I get from Code Minifier?
You get minified code with comments and unnecessary whitespace removed, and the exact result depends on your chosen options.
Is Code Minifier free to use?
Yes, this tool is available as part of ToolerWork and is designed for fast, no-signup use cases.
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