HTML Entity Encoder and Decoder
This tool makes characters such as ampersands, angle brackets, and quotation marks visible as text in an HTML context.
Encode reserved HTML characters for display
Convert text to safe visible entities or decode common entities back to characters.
Processing mode: browser-only for this tool. The interface does not require a server upload to perform its transformation.
Start with a focused browser tool
This tool makes characters such as ampersands, angle brackets, and quotation marks visible as text in an HTML context.
Designed for: Web developers, technical writers, and QA testers inspecting HTML snippets.
How to use this tool
Choose Encode or Decode, paste a small text sample, and inspect the output. Treat the result as a display aid and still use the output-encoding rules of the target framework.
How the result is produced
The browser uses a small explicit mapping for common HTML-sensitive characters and numeric character references for other selected code points. It does not execute the input as HTML.
Test examples
<script> becomes <script> for visible documentation text. An ampersand in a URL query value still needs URL-component handling in addition to HTML context handling.
Limitations
Encoding for HTML text is not the same as URL encoding, JavaScript-string escaping, SQL escaping, or sanitization. Context-specific output encoding and a trusted framework remain necessary.
Privacy and processing
The sample is transformed locally and is not sent to the server.
Related guide
HTML escaping is context-specific output encoding
Related tools in this category
Documentation
- https://html.spec.whatwg.org/multipage/syntax.html
- https://developer.mozilla.org/en-US/docs/Glossary/Entity
This page describes the implementation shipped with the NOFYI Tool Factory. Review the interface output before using it in a production workflow.