HTML Formatter — Beautify and Minify HTML Online Free

Paste any HTML — even single-line minified output from a build pipeline — and the tool reformats it with proper indentation, one tag per line and consistent whitespace. Choose 2, 4 or 8-space indent. The output is ready to drop into your editor or paste into a code review comment.

Prettify expands HTML for readability: each tag on its own line, nested children indented, blank lines preserved between sections. Minify strips comments, collapses runs of whitespace and removes line breaks so the file ships in fewer bytes. Use prettify for editing and review, minify for production deployment.

No — the formatter detects script and style blocks and formats their contents with the appropriate JS or CSS rules, so inline scripts stay valid and stylesheets stay readable. Self-closing tags, void elements, and namespaced attributes (svg:xmlns, xlink:href) are all handled correctly.

It handles plain HTML and HTML-like templates well, but pure JSX (curly-brace expressions, fragments, capitalised component tags) is parsed as HTML and may pick up minor cosmetic issues. For framework-specific code we recommend Prettier configured for your dialect; for raw HTML, .htm, and template files our tool is perfect.

No upload happens. The formatter runs entirely in your browser, so you can safely paste internal page templates, draft emails, or HTML containing private data without anything leaving your device.

Minify strips HTML comments, collapses any run of whitespace between tags to a single space, and removes line breaks. The result usually renders the same and is often noticeably smaller, but the space between inline tags can be lost and text inside pre or textarea blocks is flattened, so check the page before you ship it. Combined with gzip on the server, this shrinks initial page weight noticeably on content-heavy pages.

Yes — click Download to save the prettified output as output.html or the minified output as output.min.html. The file is UTF-8 encoded, so it works equally well with English, Cyrillic, CJK and right-to-left content.

It is a small browser-only utility — zero hosting cost — so we ship it free as part of our developer toolkit. No ads, no tracking on the output, and file uploads up to 5 MB.

Prettify mode lets you pick 2, 4 or 8 spaces of indentation. Pick the width your editor or code style uses, then copy the result or download it as output.html so the formatting carries straight into your project.

The indent selector (2, 4 or 8 spaces) only applies in Prettify mode, since Minify strips all whitespace and line breaks by design — there is nothing left to indent. Switch back to Prettify to see the indent width take effect again.

As you paste or edit, the tool automatically runs a structural check and lists any unclosed, mismatched or stray closing tags directly under the output panel — no separate button needed. A green "No structural issues found" message confirms the markup is well-formed.

Use Prettify mode with 2-space indent — it's the most common convention and keeps diffs compact — then check the structural-issues panel to confirm they haven't left an unclosed tag. Once reviewed, switch to Minify mode before shipping to production to strip the extra whitespace back out.

Yes — drag an .html, .htm or .xhtml file onto the upload area, or click it to browse, and its contents load straight into the input box exactly as if you'd pasted them. From there, Prettify, Minify, indent width and the structural checker all work identically whether the markup came from a file or a paste.

Yes — once there's output, a Copy button appears next to the output panel and the primary action area. Clicking it copies the current Prettify or Minify result to your clipboard instantly (it briefly shows 'Copied!' for confirmation), so you can paste directly into your editor or a code review comment without saving an intermediate .html file.

No — HTML Prettify runs entirely in your browser, so what you paste never leaves the machine you are on. That matters if you are checking something that contains a token, a key or customer data. Closing the tab is enough to clear it.

The error points at the first position that could not be parsed, which is usually just after the real mistake rather than on it — a missing comma, an unclosed quote or bracket, or a smart quote pasted in from a document instead of a straight one. Check the line above the reported position first.

HTML Prettify supports free standard use within the published processing allowances. Free downloads are clean — no watermark. No signup is required for standard tool use. Photo effects and AI edits have a web-size limit on Free, with the original-resolution result available through Premium or one credit. Crop, resize, rotate, compress and convert stay full size. Published processing allowances and file limits still apply.

No — HTML Prettify runs in the browser on desktop and phone. There is nothing to install, no trial to start, and no license to buy before you can see whether it does what you need. Try it on the file you are actually stuck with rather than a sample.

Minify removes whitespace that sits between two tags. When that space separated two inline elements, such as a bold word followed by an italic word, the words now touch. Keep the space inside one of the tags, or minify only the parts of the page that are made of block elements.

It can. Minify collapses indentation and runs of line breaks to single spaces everywhere, including inside script blocks. A line comment followed by an indented line then runs on into the code that came after it, which disables that code. Use block comments in inline scripts, or leave scripts out of the page you minify.

HTML lets li and p end tags be left out, and browsers close them for you. The structure check is a simple tag stack and expects every opening tag to be closed, so it reports those elements. Close them explicitly if you want a clean result, or ignore those lines when you know the markup is valid.

Yes. Every HTML comment is removed, and that includes conditional comments written for old versions of Internet Explorer, which then stop applying. Keep the unminified source if a comment carries information you need, such as a license note, and add it back after minifying.

An uploaded file must be 5 MB or smaller, and a larger one is refused with a message that keeps your current text. Pasting text is not subject to that upload limit, but a very large paste depends on your browser and device memory, so split huge pages into sections.