Should I minify HTML, CSS, and JavaScript together?

Yes, they are usually minified together in a build pipeline because each targets a different asset. This tool minifies the HTML shell and deliberately leaves inline and contents untouched, so pair it with a CSS minifier for stylesheets and a dedicated JavaScript minifier (like terser) for scripts. Minifying all three gives the largest total byte reduction across a page.

Will minifying break my blocks or inline scripts?

No. Before any transform runs, the full contents of , , and elements are masked out and restored verbatim at the end. Code samples keep every line break and space, textarea default values are untouched, and inline JavaScript or CSS is passed through byte-for-byte rather than being re-minified.

How much does HTML minification actually save?

Typical server-rendered or template-generated pages shrink 10–25%, mostly from indentation and comments; deeply nested, heavily indented markup can drop more. On top of gzip or Brotli the wire savings are smaller, but the HTML document is render-blocking by definition, so even a few KB off the first response is worth having. The savings badge shows your exact numbers.

Is collapsing whitespace between tags safe?

This tool collapses runs of whitespace to a single space rather than deleting them, which is the conservative choice: HTML treats any whitespace run as one space when rendering, so the visual output is identical. Deleting inter-tag whitespace entirely (as aggressive minifiers can) may visibly join inline elements - that is exactly the class of bug this tool avoids.

What are conditional comments and why keep them?

Conditional comments like ... are directives that legacy Internet Explorer parsed to include IE-specific markup. If you still serve enterprise users on old IE or maintain legacy email templates, stripping them silently changes behavior. The preserve option keeps them while ordinary comments are removed; turn it off if you have no legacy targets.

Does the minifier remove whitespace inside attribute values?

No. The tag parser is quote-aware, so anything inside single or double quotes - alt text, title attributes, inline JSON in data attributes, srcset lists - is copied through exactly as written. Only whitespace between attributes and around tag syntax is collapsed.

Can I un-minify a page I saved from production?

Yes - paste it and click Beautify. Nested tags get proper indentation, block elements each get their own line, and inline elements stay in the text flow so paragraphs remain readable. Script and style blocks keep their original internal formatting; if those are minified too, run them through a dedicated JS or CSS beautifier separately.

Should I minify HTML at build time instead?

For production apps, yes - put html-minifier-terser or your framework’s built-in compression in the pipeline so it happens on every deploy. This tool is for the cases a pipeline does not cover: one-off landing pages, email templates, CMS snippets, checking what a minify pass would save, or beautifying markup you did not author.

Does it handle void elements like and correctly?

Yes. The 14 HTML void elements (br, img, input, meta, link, hr and the rest) are recognized as self-contained, so the beautifier never increases indentation after them or expects a closing tag. Self-closing XML-style syntax like is also accepted and left as written.

Will minification change how my page renders or affect SEO?

Rendering is unchanged because only whitespace the browser already ignores is collapsed, and comments are invisible to users anyway. For SEO the effect is neutral-to-positive: search engines parse minified HTML identically, and the faster document delivery feeds page-experience signals like LCP. Structured data in is inside a script tag, so it is preserved exactly.

Is my HTML uploaded anywhere?

No. Both minify and beautify run entirely in your browser - no network request is made with your markup, nothing is logged or stored, and the tool works offline once loaded. You can paste unreleased product pages or client work without a data-handling concern.

HTML Minifier & Beautifier

Minify HTML markup for faster page loads or beautify it for readable, indented source

Indent:

Minify optionsRemove commentsCollapse whitespaceKeep conditional comments

Input HTML

Output

Output will appear here...

Category:minify

Mode:Offline

Version:1.0.0

Access:Free

What is HTML Minifier & Beautifier?

HTML Minifier & Beautifier interface on Toolz.dev - Minify HTML markup for faster page loads or beautify it for readable, indented source

HTML Minifier & Beautifier compresses HTML documents by removing comments and collapsing the whitespace your templates and editors leave behind - the indentation, blank lines and trailing spaces that browsers ignore but every visitor still downloads. The HTML document is the very first resource in every page load; nothing renders until it arrives, so bytes trimmed here move First Contentful Paint and Time to First Byte-adjacent metrics more directly than almost any other asset. Server-rendered pages and template output routinely shed 10–25% of their size.

The critical detail in HTML minification is knowing what not to touch. This tool masks the contents of <pre>, <textarea>, <script> and <style> elements before doing anything else and restores them byte-for-byte afterwards, so code samples keep their line breaks, textarea defaults keep their formatting, and inline JavaScript and CSS are never rewritten. Quoted attribute values are preserved exactly, and IE conditional comments can be kept even while ordinary comments are stripped - the same discipline a build-time minifier like html-minifier-terser applies.

The beautifier does the reverse: it takes minified or messy markup and re-indents it with nesting-aware structure, keeping inline elements like <span>, <a> and <strong> flowing with their surrounding text instead of exploding every tag onto its own line. Everything runs 100% client-side in your browser - your markup is never uploaded or logged, so scraped pages, CMS exports and proprietary templates are all safe to paste, and the tool keeps working offline.

Whitespace in HTML is not always insignificant, which is why pre, textarea, script and style are left exactly as they are. Collapsing a space inside a pre block changes what the reader sees, and collapsing one inside a script can change what the script does.

How to use HTML Minifier & Beautifier?

Paste your HTML

Drop a fragment, a component template, or a full document into the input area. Both formatted and already-minified markup are accepted.

Set your options

For minification, toggle comment removal, whitespace collapsing and conditional-comment preservation. For beautifying, choose 2, 4 or 8 space indentation.

Click Minify or Beautify

Minify compresses the markup while protecting <pre>, <textarea>, <script> and <style> content. Beautify re-indents nested tags and keeps inline elements readable. The savings badge shows exact before/after sizes.

Copy or download

Copy the result to your clipboard, or download it as an .html file ready to deploy or inspect.

Key Features

Protected content blocks

<pre>, <textarea>, <script> and <style> contents are masked and restored byte-for-byte - code samples and inline scripts are never mangled

Configurable minification

Independent toggles for comment removal, whitespace collapsing and IE conditional comment preservation

Attribute-safe collapsing

Whitespace inside quoted attribute values is preserved exactly, so alt text, data attributes and inline JSON survive intact

Structure-aware beautifier

Indents nested block elements while keeping inline tags like <span> and <a> flowing with their text; void tags need no closing pair

Frequently Asked Questions

HTML minification removes the parts of a document a browser ignores when rendering - comments, indentation, blank lines and trailing spaces - to shrink the file without changing what the page displays. Because the HTML document is the first resource in every page load and nothing renders until it arrives, trimming its size helps Time to First Byte-adjacent metrics and First Contentful Paint.