String Escape & Unescape Tool

String Escape & Unescape Tool: Core Features and Principles

When you need to display < in an HTML document without it being parsed as a tag, or pass query parameters containing spaces in a URL, special character escaping ensures accurate data transmission. This tool uses standardized algorithms to convert special characters into escape sequences (such as < or %20), or unescape them back to their original form. It covers three main scenarios: HTML entities, URL encoding, and JavaScript strings.

Why Choose Our Escape & Unescape Tool?

• 3-in-1 Processing: Supports HTML, URL, and JS escaping standards all in one place.
• Instant Bidirectional Conversion: Get results immediately as you type, with no page reloads required.
• Client-Side Processing: Sensitive data is never uploaded to our servers, ensuring your privacy and security.

How to Use

1. Paste your original text containing special characters into the input box.
2. Select the escape (encode) or unescape (decode) operation.
3. Specify the target format (HTML, URL, or JS).
4. Copy the processed result from the output box to use directly.

Frequently Asked Questions (FAQ)

Why does URL encoding convert spaces to %20?
This is defined by the RFC 3986 standard: spaces in URLs must be encoded as %20, while the plus sign (+) is generally reserved for query parameters.

How do I handle multi-layered nested escape characters? We recommend processing them in the order of your actual application scenario: first unescape the outermost encoding (e.g., HTML entities), then process the inner escaping (e.g., JS strings). Processing them in the wrong order will cause parsing failures.

Important Notes

Please verify the original encoding format before unescaping. Mixing different escape standards (such as treating HTML entities as JS escapes) will result in garbled text. When processing JSON strings containing sensitive information, we recommend operating in an offline environment.

Technical Notes & Best Practices

When developing API endpoints, it is highly recommended to use URL encoding for query parameters. For example, the search term "咖啡&茶" should be encoded as q=%E5%92%96%E5%95%A1%26%E8%8C%B6, where the Chinese characters use UTF-8 encoding and the & symbol is converted to %26. Note that browser address bars will automatically decode and display the text, but the actual transmitted data remains the encoded string.