Bộ mã hóa/giải mã HTML
Thoát các ký tự đặc biệt hoặc giải mã HTML
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What is HTML Encoder/Decoder?
HTML special characters like <, >, &, and " must be encoded as HTML entities (<, >, &, ") to display correctly in browsers and prevent Cross-Site Scripting (XSS) attacks. DailyDevTools' HTML Encoder/Decoder instantly converts text containing HTML special characters to safe entity-encoded HTML, and decodes encoded HTML back to readable text.
How to use HTML Encoder/Decoder
- 1Paste your text or HTML into the input field
- 2Click Encode to convert characters like <, >, &, ", and ' to their HTML entity equivalents
- 3Click Decode to convert HTML entities (&, <, ', etc.) back to their original characters
- 4Use the output for safely rendering user input in HTML pages or escaping content for attributes
Frequently asked questions
Why do I need to encode HTML characters?
Unencoded user input inserted into HTML can break page structure or enable XSS attacks. If a user enters <script>alert('xss')</script>, without encoding, the browser executes it. Encoding turns < into < — harmless text.
What is the difference between HTML encoding and URL encoding?
HTML encoding converts characters to HTML entities (&, <) for safe display in HTML. URL encoding converts characters to percent-encoded sequences (%26, %3C) for safe use in URLs. They serve different contexts.
Which characters need to be HTML encoded?
The five essential characters: & (→ &), < (→ <), > (→ >), " (→ "), ' (→ ' or '). Encoding all non-ASCII characters is optional but recommended for international text in older systems.
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