HTML 实体编码 / 解码
将特殊字符编码为 HTML 实体或将其解码还原
| 字符 | 实体 (Named) | 实体 (Numeric) | 名称 |
|---|---|---|---|
| & | & | & | Ampersand |
| < | < | < | Less Than |
| > | > | > | Greater Than |
| " | " | " | Double Quote |
| ' | ' | ' | Apostrophe |
| ␣ | |   | Non-breaking Space |
| © | © | © | Copyright |
| ® | ® | ® | Registered |
| ™ | ™ | ™ | Trademark |
| € | € | € | Euro |
| £ | £ | £ | Pound |
| ¥ | ¥ | ¥ | Yen |
| « | « | « | Left Guillemet |
| » | » | » | Right Guillemet |
| — | — | — | Em Dash |
| – | – | – | En Dash |
| … | … | … | Ellipsis |
| · | · | · | Middle Dot |
| • | • | • | Bullet |
| × | × | × | Multiplication |
| ÷ | ÷ | ÷ | Division |
使用方法
粘贴或输入内容
在输入区域输入您的文字、代码或数据。
选择选项
选取要应用的转换方式或格式。
复制结果
一键将输出结果复制到剪贴板。
为什么使用此工具
100% 免费
没有隐藏费用，没有付费等级——所有功能完全免费。
无需安装
完全在浏览器中运行。无需下载或安装任何软件。
隐私且安全
您的数据永远不会离开您的设备。不会上传至任何服务器。
支持移动设备
完全响应式设计——在手机、平板或桌面电脑上均可使用。
HTML Entity Encoding for Secure Web Content
Key Takeaways
- HTML entity encoding converts special characters like <, >, and & into safe representations that browsers render as text, not code.
- Proper entity encoding is a primary defense against Cross-Site Scripting (XSS) attacks in web applications.
- All encoding and decoding is processed in your browser — your content never leaves your device.
HTML entity encoding is a fundamental web security practice that converts characters with special meaning in HTML into their entity equivalents. Without proper encoding, user-supplied content containing characters like < or > could be interpreted as HTML tags, leading to broken layouts or dangerous XSS vulnerabilities. Every web developer should understand when and how to apply entity encoding.
Cross-Site Scripting (XSS) remains in the OWASP Top 10 — proper output encoding prevents the majority of XSS attacks.
Security Importance
Key Concepts
Named vs. Numeric Entities
Named entities like & and < are human-readable, while numeric entities like & and < (or hex &) work for any Unicode character. Named entities cover only a subset of characters.
The Five Critical Characters
The characters < > & " ' must always be encoded in HTML content: < > & " '. These five characters form the minimum encoding set for XSS prevention.
Context-Specific Encoding
Different HTML contexts (element content, attributes, JavaScript, CSS, URLs) require different encoding strategies. Entity encoding alone is not sufficient for JavaScript or URL contexts.
Unicode Special Characters
HTML entities give access to thousands of special characters — from mathematical symbols to currency signs to arrows — without needing special fonts.
Pro Tips
Always encode output, never input — store raw data in your database and encode when rendering to HTML.
Use your framework's built-in escaping (React JSX, Angular templates, Vue {{ }}) rather than manual entity encoding.
Remember to encode inside HTML attributes too — an unencoded quote in an attribute value can break out of the attribute context.
For content that should contain real HTML (like a rich text editor), use a sanitization library like DOMPurify instead of entity encoding.
All HTML entity encoding and decoding is performed entirely in your browser. Your content is never transmitted to any external server, ensuring privacy for sensitive HTML content.