Free HTML Minifier Online
Minify and compress HTML code online. Remove whitespace and comments to reduce file size. Free HTML minifier.
Key Features
Everything you need in one free tool
Completely free with no registration, and no hidden charges.
browser-side workflows is done locally in your browser. Your data stays private.
Instant results using browser-native APIs and optimized algorithms.
Key Takeaways
- The minifier runs entirely in your browser, so your markup is processed on your device.
- It strips standard HTML comments, collapses whitespace, and removes gaps between tags, but it preserves IE conditional comments starting with [if and leaves attribute values, scripts, and style contents untouched.
- Because it collapses whitespace everywhere, including inside pre, textarea, and code blocks, keep those whitespace-sensitive sections out of the minified output or restore their formatting afterward.
- Always minify a copy rather than your source files, and skip minification if your build pipeline already does it or the page depends on whitespace-sensitive content.
How to Minify HTML in Your Browser
Paste Your HTML
Copy the markup from your page, template, or email and paste it into the Input HTML box. The tool runs entirely in your browser, so the markup stays on your device and is not uploaded anywhere.
Click Minify HTML
Press the Minify button. The tool strips standard comments, collapses runs of whitespace into single spaces, and removes the gaps between tags. The size summary shows the original bytes, the minified bytes, and the percent saved.
Copy or Clear
Use Copy Result to place the minified output on your clipboard, then paste it into your build, CMS, or deployment. Use Clear to empty both boxes before starting again with new markup.
What This Minifier Changes
This tool applies a focused set of text transformations to your markup. It does not rewrite attributes, remove optional tags, or touch script and style contents. The table below shows exactly what each pass does so you know what to expect from the output.
| Action | What Happens | Effect on Output |
|---|---|---|
| Comment removal | Standard HTML comments are deleted | Smaller file, hidden notes gone |
| Conditional comments | IE conditional comments starting with [if are kept | Legacy targeting preserved |
| Whitespace collapse | Tabs, newlines, and repeated spaces become one space | Fewer bytes, single line output |
| Tag spacing | Whitespace between adjacent tags is removed | No gaps between elements |
| Edge trimming | Leading and trailing whitespace is stripped | Clean start and end |
| Attribute values | Left untouched by name | Quotes and values unchanged |
When to Use HTML Minification
Shipping to Production
Minify static pages, partials, and templates before deploying so visitors download fewer bytes. The size summary helps you confirm the reduction is worthwhile for the file.
Email Markup
HTML email clients count every byte, and Gmail can clip large messages. Stripping comments and whitespace keeps newsletter markup lean before you send.
Keep Working Files Readable
Do not paste your source files back over themselves. Keep indented, commented copies for editing and minify only the version you publish.
When to Skip It
If your build pipeline already minifies output, or the page relies on whitespace-sensitive content, run a quick test before adopting the minified result.
Common Problems and Fixes
Spacing between words disappeared
The tool collapses whitespace between tags to nothing, which can join inline elements such as links or spans. If words run together, add a single non-breaking space or keep those elements on the same line in your source.
Content inside pre or textarea changed
This minifier collapses whitespace everywhere, including inside pre, textarea, and code blocks where spacing matters. Keep those sections out of the minified markup or re-add their original formatting afterward.
A comment I needed was removed
Only IE conditional comments that begin with [if are preserved. Other comments, including template markers and license notes, are stripped. Move anything you must keep out of HTML comments.
Copy button did nothing
The copy action uses the clipboard API, which needs a secure context and clipboard permission. If nothing copies, select the output text manually and copy it, or reload the page over HTTPS and try again.
About This Tool
Minify HTML by removing whitespace and comments to reduce file size and improve page load speed. This free tool works entirely in your browser for maximum privacy and convenience.
Frequently Asked Questions
Is this tool completely free?
Yes. The tool is 100% free to use with no registration, no subscription and no usage limits.
You can use it as many times as you need for personal or commercial projects without any cost.
We believe developer and productivity tools should be accessible to everyone without paywalls.
Is my data secure?
Yes. Everything runs locally in your browser using JavaScript. No data is transmitted to our servers — your files never leave your device.
You can safely use this tool with sensitive or confidential information without privacy concerns.
We do not log or store any input you provide to this tool.
Does this work on mobile devices?
Yes. The tool is fully responsive and works in any modern mobile browser on iOS and Android.
The interface adapts to smaller screens while maintaining full functionality.
All buttons, inputs and outputs are accessible on touch devices.
What browsers are supported?
The tool works in all modern browsers including Google Chrome, Mozilla Firefox, Apple Safari and Microsoft Edge.
We recommend keeping your browser up to date to ensure the best experience and access to the latest browser APIs.
Internet Explorer is not supported.
Do I need to install any software?
No. The tool runs entirely in your web browser with no downloads, plugins or installations required.
This makes it accessible from any device without modifying your system.
Simply open the page and start using the tool immediately.
How accurate are the results?
The tool uses browser-native APIs and standard algorithms to deliver accurate results consistent with industry expectations.
Where applicable, we implement well-tested open standards such as the Web Crypto API for hash generation and the native JSON parser for JSON tools.
If you encounter any result that seems incorrect, please try clearing and re-entering your input.
Can I use this tool in commercial projects?
Yes. The tool is free for personal and commercial use with no attribution required.
You can use generated outputs such as passwords, UUIDs and text in any project without restrictions.
The tool itself may not be resold or redistributed but using its outputs is completely unrestricted.
Where can I get help if I have a problem?
For questions or issues you can reach us through our contact page.
We monitor feedback and release regular updates to improve accuracy and add features.
Community suggestions are welcome and have shaped many of the options available in our tools.
Sources and References
Format and tool details on this page are based on the official specifications and documentation below.
- HTML Living Standard- WHATWG
- HTML- MDN Web Docs