HTML Entity Encoder / Decoder

编码/解码HTML实体。
结果

Encode & Decode

Special characters or all characters (&#NNN;).

Two Modes

Special chars only or full numeric encoding.

Copy Result

One-click copy to clipboard.

Client-side

All processing in your browser. No data uploaded.

关于HTML Entity Encoder / Decoder

The HTML Entity Encoder/Decoder is an essential tool for web developers and content editors who need to safely embed special characters in HTML documents. HTML reserves certain characters — such as <, >, &, and " — for its own syntax, so using them raw in content can break page structure or create security vulnerabilities like Cross-Site Scripting (XSS). This tool converts those characters to their safe HTML entity equivalents (e.g., & becomes &) in encode mode, or reverses the process in decode mode. There is also a "Encode All" mode that converts every character to its numeric entity form (&#NNN;), which is useful for obfuscating email addresses or ensuring maximum compatibility across character sets. All processing happens entirely in your browser using the browser's own DOM — no data is ever sent to a server, keeping your content private.

如何使用HTML Entity Encoder / Decoder

  1. Select Encode or Decode mode using the toggle at the top of the tool.
  2. In Encode mode, choose between "Special chars only" (converts &, <, >, ", ') or "All characters" (converts every character to a numeric &#NNN; entity).
  3. Paste or type your text into the input textarea.
  4. The encoded or decoded result appears instantly in the output area below.
  5. Click the Copy button next to the result to copy the output to your clipboard.
  6. Paste the result into your HTML file, template engine, or CMS editor.

常见问题

What is an HTML entity?

An HTML entity is a special text sequence that represents a character in HTML. It starts with & and ends with ;. For example, &amp;lt; displays as < without being interpreted as an HTML tag. Entities are used to display reserved characters and symbols that have special meaning in HTML.

Why do I need to encode HTML entities?

If you include raw < or > characters inside HTML content, the browser may interpret them as tag delimiters and break your page structure. Encoding them as &amp;lt; and &amp;gt; tells the browser to display the character visually rather than parse it as markup. This is also important for preventing XSS attacks in user-generated content.

What is the difference between "Special chars only" and "All characters" modes?

"Special chars only" encodes the five HTML-reserved characters: &, <, >, ", and '. "All characters" encodes every character as a numeric decimal entity like &#65; for the letter A. The latter is useful for obfuscation or ensuring compatibility with non-UTF-8 environments.

Is my data sent to a server?

No. All encoding and decoding is performed entirely in your browser. Your text never leaves your device. This makes the tool safe to use with sensitive or proprietary content.

Can I decode encoded email addresses?

Yes. If someone has encoded an email address using numeric entities to hide it from spam scrapers, you can paste it into the decoder to reveal the plain text version.

HTML Entity Encoder / Decoder 完全使用指南与免费在线工具

无需安装、完全免费、纯前端本地运行的高效 HTML Entity Encoder / Decoder 工具

用于快速解决：编码/解码HTML实体。。无需安装复杂软件，打开网页即可立即使用，极速且安全。

为什么选择 Metoolzy 的 HTML Entity Encoder / Decoder？

  • 秒级即时响应: 极致性能优化，输入即可见结果。
  • 数据绝对安全: 纯浏览器本地计算，数据绝不上传服务器。
  • 完全免费使用: 无需注册登录，无任何隐形消费。

三步快速上手

  1. 打开 Metoolzy HTML Entity Encoder / Decoder 工具页面。
  2. 在输入区粘贴或上传您的数据。
  3. 即时查看处理结果并点击复制或下载。

功能对比表

对比项 Metoolzy HTML Entity Encoder / Decoder 普通在线工具 本地客户端软件
使用成本 永久免费 有次数限制或收费 需购买授权
隐私保护 纯本地内存运行 数据需上传云端 本地运行

适用人群与应用场景

  • 软件开发人员日常调试与数据转换
  • UI/UX 设计师资产处理
  • 运营与办公人员效率提升

常见问题解答 (FAQ)

处理的数据会被记录或保存吗？

绝不会。所有运算均在您的浏览器本地完成，没有任何数据回传。