HTML Encoder / Decoder
Encode or decode HTML entities in any text.
Encode or decode HTML entities in any text.
This free HTML Encoder / Decoder from KX Toolkit is part of our all-in-one online toolkit. It runs entirely in your browser, so your data never leaves your device for client-side operations. 100% free, forever - no paywall, no credit card, no trial.
How to use the HTML Encoder / Decoder
- Paste your input - JSON, regex pattern, JWT, URL etc.
- Pick any flags or options the tool supports.
- Click the action button (Format, Test, Decode).
- Copy the result or download it as a file.
What you can do with the HTML Encoder / Decoder
- Format and validate API responses while debugging.
- Test regex patterns against real input before deploying.
- Decode JWTs to inspect claims and expiry.
- Generate UUIDs for migrations, tests and seeders.
Why use KX Toolkit's HTML Encoder / Decoder
- Browser-based: Works on Windows, macOS, Linux, iOS and Android - no install, no extension.
- Privacy-first: Client-side tools never upload your data; server-side tools delete files right after processing.
- Mobile-friendly: Full feature parity on phones and tablets - not a stripped-down view.
- Fast: Optimised for instant feedback. No artificial waiting screens, no email-gated downloads.
- One hub for everything: 300+ tools across SEO, text, image, PDF, code, color, calculators and more - skip switching between sites.
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When do I need to encode HTML entities?
Encode any user input that you insert into HTML to prevent cross-site scripting. The five characters that must be encoded are less-than, greater-than, ampersand, double quote, and single quote. Server-side templating engines escape by default, but raw insertion of user data into innerHTML or template strings bypasses that protection - encode manually in those cases.
What is the difference between named and numeric entities?
Named entities like & and © are easier to read but limited to a fixed list. Numeric entities like & (decimal) and & (hex) work for any Unicode codepoint. Numeric entities are universally supported, while a handful of named entities only work in HTML5 documents. When unsure, prefer numeric form for portability across XML and older parsers.
Should I encode every Unicode character or just the special ones?
Only the special HTML characters need encoding for safety. Most Unicode characters render natively when the document declares UTF-8, which it should. Encoding everything bloats the file and makes search and copy harder. Reserve full encoding for legacy systems that cannot guarantee UTF-8 transport, such as certain email clients or older XML pipelines.
How do I decode entities back into plain text?
Use a DOMParser or set innerHTML on a temporary element and read textContent. Avoid hand-rolled regex replacements because they miss edge cases like numeric entities and rare named ones. On the server, use the encoding library that ships with your framework - for example html_entity_decode in PHP or the he package in Node.
Is HTML encoding the same as URL encoding?
No. HTML encoding turns characters into ampersand-prefixed entities for use in markup. URL encoding (percent encoding) turns them into percent-prefixed bytes for use in URLs and form data. They cannot substitute for each other - using URL encoding in HTML produces visible percent signs, and using HTML entities in URLs corrupts the destination address.
Does encoding protect against all XSS attacks?
It blocks the most common reflected and stored XSS in HTML body context but is not enough by itself. Different contexts need different encodings: attribute values, JavaScript strings, CSS values, and URLs each have unique escape rules. Use a context-aware templating engine and a Content Security Policy as defense in depth rather than relying on a single encoder.
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