HTML 格式化工具 在线免费版

Free 免费 · 无需注册 · 数据不上传
Indent
Error
HTML INPUT
OUTPUT
// formatted HTML output

更多开发工具

CSS 格式化
格式化与压缩
SQL 格式化
格式化 SQL
HTML→Markdown
转 Markdown
XML 格式化
格式化与验证
正则表达式
实时测试
URL 编码
百分比编码
JSON 格式化
格式化、验证与压缩
Base64
编码/解码

为什么这是最好的在线 HTML 格式化工具

格式化 & 美化 HTML

Paste minified or poorly indented HTML and get back cleanly structured code with consistent indentation. Supports 2-space, 4-space, and tab indentation. Void elements like <br>, <img>, and <input> are handled correctly.

语法高亮

Color-coded tag names, attributes, values, comments, and doctype declarations make formatted HTML easy to review. The output panel renders the highlighted code without executing it.

压缩 HTML

Strip all formatting whitespace and HTML comments to produce compact, production-ready HTML. Reduces file size and speeds up page load time without changing how the page renders.

隐私优先

All processing runs entirely in your browser — no HTML is ever sent to a server. Safe for templates containing sensitive data, internal admin pages, or proprietary front-end code.

常见问题

What is an HTML formatter?

An HTML formatter (also called a beautifier or pretty printer) takes raw or minified HTML and reformats it with consistent indentation and line breaks, making the code easier to read and debug. It does not change how the HTML renders in a browser.

Does formatting HTML change how it looks in the browser?

No. HTML formatters only add or remove whitespace between tags. Browsers collapse multiple whitespace characters in most contexts, so formatting changes are invisible to end users. The only exception is content inside pre or textarea elements, where whitespace is significant.

What is HTML minification?

HTML minification removes unnecessary whitespace and comments to reduce file size. Minified HTML loads faster because smaller files transfer more quickly over the network. It is commonly applied to production HTML by build tools like webpack or Vite.

Why is my HTML indentation inconsistent?

Inconsistent HTML indentation is usually caused by mixing spaces and tabs, copying from different editors, or manual editing errors. Pasting your HTML into this formatter and applying a consistent indent style fixes all indentation at once.

深度指南
开发者必备工具指南
正则、Cron、时间戳、URL 等
阅读指南
`; function lS(){document.getElementById('ia').value=SMP;onI();} async function pasteIn(){try{const t=await navigator.clipboard.readText();document.getElementById('ia').value=t;onI();}catch(e){}} async function cpO(ev){if(!oD)return;if(await cpT(oD)){const b=ev.currentTarget;b.style.color='var(--a)';setTimeout(()=>b.style.color='',900);}} function dlF(fn){if(!oD)return;const a=document.createElement('a');a.href=URL.createObjectURL(new Blob([oD],{type:'text/html'}));a.download=fn;a.click();} document.addEventListener('keydown',e=>{if((e.ctrlKey||e.metaKey)&&e.key==='Enter'){e.preventDefault();fmt();}});