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HTML Minifier

Strip whitespace and comments from HTML to shrink page size.

Best for: Before deploying static HTML, or to measure how much a template can shrink.

Complete guide

Input

How it's calculated & sources
The HTML Minifier uses the standard, deterministic formula, so the same inputs always produce the same result. It runs entirely in your browser, so your inputs are never uploaded. Last reviewed June 2026.

Free & no sign-up · runs entirely in your browser. Results are estimates for general information, not professional advice — verify important decisions with a qualified expert. Last reviewed June 2026.

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Complete guide

Quick answers

Short, sourced answers to the questions people (and AI assistants) ask most.

What is HTML Minifier?
An HTML minifier shrinks a page's markup by removing comments, redundant whitespace and some optional tags and attributes, so the document downloads faster.
Why does HTML Minifier matter?
Smaller markup that renders identically. As with CSS, server-side gzip or brotli compresses it much further on top.
How is HTML Minifier calculated?
It collapses insignificant whitespace, strips comments and removes optional quotes or closing tags where the HTML spec still parses correctly — without changing how the page renders.
What are common html minifier mistakes?
Collapsing whitespace inside <pre>, <textarea> or <code>, where spacing is significant.
When should you use the HTML Minifier?
Before deploying static HTML, or to measure how much a template can shrink.

What is the HTML Minifier?

An HTML minifier shrinks a page's markup by removing comments, redundant whitespace and some optional tags and attributes, so the document downloads faster.

How the HTML Minifier works

It collapses insignificant whitespace, strips comments and removes optional quotes or closing tags where the HTML spec still parses correctly — without changing how the page renders.

Common mistakes to avoid

  • Collapsing whitespace inside <pre>, <textarea> or <code>, where spacing is significant.
  • Removing whitespace between inline elements, which can change spacing on the page.
  • Editing minified HTML by hand instead of the source.

Keywords: html, minify, compress.

Sources: web.dev — Minify and compress network payloads

Reviewed by the Free Tools Galaxy editorial team · Updated June 2026 · Calculated privately in your browser.

Frequently asked questions

Is the HTML Minifier free to use?+

Yes. Every tool on Free Tools Galaxy is 100% free, runs in your browser and requires no signup.

How accurate is the HTML Minifier?+

HTML Minifier uses the standard html minifier formula in double-precision arithmetic, so the same inputs always produce the same result and you can verify any figure by hand. It is an educational estimate — real-world outcomes depend on your actual rates, rules and assumptions.

Do you store my inputs?+

No. The HTML Minifier runs entirely in your browser. Nothing is uploaded or saved to a server.

Can I use the HTML Minifier on mobile?+

Yes — the interface is fully responsive and works on phones, tablets and desktops.

What are common mistakes to avoid?+

The most frequent mistake is mixing units. Double-check your inputs use a single, consistent unit before clicking Calculate.

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Share & publish

Share & challenge

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Share-to-grow kit (Reddit, LinkedIn, Medium)
Reddit post
Title: I built/used this free html minifier — instant, no signup

Body: Strip whitespace and comments from HTML to shrink page size. Try it: https://freetoolsgalaxy.com/tools/html-minifier
LinkedIn post
HTML Minifier on Free Tools Galaxy — Strip whitespace and comments from HTML to shrink page size. https://freetoolsgalaxy.com/tools/html-minifier
Medium intro
# HTML Minifier — the free tool I keep coming back to

Strip whitespace and comments from HTML to shrink page size.

Try it: https://freetoolsgalaxy.com/tools/html-minifier
Quora answer
The fastest way is to use a free in-browser html minifier: https://freetoolsgalaxy.com/tools/html-minifier. Strip whitespace and comments from HTML to shrink page size.

Embed this tool anywhere

Free embed code for blogs, docs and dashboards. Every embed sends a backlink home — helping you and the galaxy grow together.

HTML iframe
Drop into any site — auto-resizes to its content height, theme-aware.
<iframe src="https://freetoolsgalaxy.com/tools/html-minifier?embed=1" title="HTML Minifier" loading="lazy"
  style="width:100%;height:600px;border:0;border-radius:16px;background:#0b1020"
  allow="clipboard-write"></iframe>
<script>window.addEventListener("message",function(e){if(e.data&&e.data.type==="ftg-embed-height"){document.querySelectorAll("iframe").forEach(function(f){if(f.contentWindow===e.source){f.style.height=e.data.height+"px";}});}});</script>
<p><a href="https://freetoolsgalaxy.com/tools/html-minifier" target="_blank" rel="noopener">Powered by HTML Minifier on Free Tools Galaxy</a></p>
Responsive wrapper
Aspect-locked container — good for blog post bodies.
<div style="position:relative;padding-bottom:75%;height:0;overflow:hidden;border-radius:16px">
  <iframe src="https://freetoolsgalaxy.com/tools/html-minifier?embed=1" title="HTML Minifier" loading="lazy"
    style="position:absolute;inset:0;width:100%;height:100%;border:0" allow="clipboard-write"></iframe>
</div>
WordPress / Markdown
Paste in a custom-HTML block or markdown file.
[HTML Minifier — free online tool](https://freetoolsgalaxy.com/tools/html-minifier)

<iframe src="https://freetoolsgalaxy.com/tools/html-minifier?embed=1" width="100%" height="600" frameborder="0"></iframe>
Text link-back
Minimal credit link — best for sidebars and footers.
<a href="https://freetoolsgalaxy.com/tools/html-minifier" target="_blank" rel="noopener">Try the free HTML Minifier</a>

Share-to-Grow Kit

Pre-written, ready-to-paste posts for every major channel. Help others discover this tool — and earn backlinks.

Title
I built a free pregnancy due date calculator that works instantly in the browser — no signup, no ads in your face
Body
Hey r/[subreddit],

I kept needing a quick pregnancy due date calculator and most options online were slow or behind paywalls, so I built one that:

• Runs 100% in your browser (your data never leaves your device)
• No signup, no email wall, no popups
• Loads in under a second on mobile

It covers the standard pregnancy due date use cases (pregnancy, due, date, baby) and links out to the formula + worked examples if you want to learn the math.

Link: https://freetoolsgalaxy.com/tools/pregnancy-due-date-calculator

Happy to take feedback — what's missing?
Post to a relevant subreddit (e.g. r/InternetIsBeautiful, r/webdev, r/productivity). Avoid spammy subs.
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