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linkURL Encoder
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URL Encoder/Decoder is a free online tool that safely encodes special characters in web addresses or decodes them back to original characters. It properly converts URLs containing Korean characters, spaces, ampersands (&), equal signs (=), and other special characters so that web browsers and servers can accurately recognize them.

Useful when safely passing query parameters during website development, when including special characters in API calls, or when sharing links with Korean characters on social media to prevent URL corruption. Follows the Percent-encoding standard, and you can copy the conversion result with a single click.

Instruction

URL Encoder / Decoder

The URL Encoder is an essential utility for web developers and digital marketers, ensuring that text strings can be safely and correctly transmitted within a Uniform Resource Locator (URL). It strictly adheres to RFC 3986 standards for percent-encoding.

The Necessity of Encoding

The internet relies on URLs to locate resources. However, the URL specification RFC 3986 defines that only a limited set of characters (US-ASCII letters, digits, and a few special symbols like hyphen, period, underscore, and tilde) are allowed in a URL. All other characters—including space, emoji, non-Latin scripts (like Hangul or Kanji), and reserved functional characters (like ?, /, &, :)—must be encoded to be transmitted.

How Percent-Encoding Works

Percent-encoding is a mechanism for encoding information in a Uniform Resource Identifier (URI). Characters are replaced by a '%' followed by their two-digit hexadecimal value. For example, a space character (ASCII value 32, hex 20) becomes "%20". A UTF-8 character like '한' (Korean for 'One' or 'Great') takes up 3 bytes in UTF-8 (0xED, 0x95, 0x9C), so it is encoded as "%ED%95%9C". This ensures that web servers can correctly interpret the requested path or query parameters regardless of the language or content.

Scenarios for Use

  • Query Parameters: When sending data to a server via a GET request (e.g., `https://api.example.com/search?q=...`), the query 'q' must be encoded. If a user searches for "C&A", sending it raw would break the URL because '&' indicates the start of a new parameter. Encoding it to "C%26A" preserves the intent.
  • Return URLs: In authentication flows (like OAuth), you often pass a 'redirect_uri' as a parameter. If this URI itself contains parameters, they must be double-encoded to prevent the browser from interpreting them prematurely.
  • Debugging: Developers often find messy, encoded strings in server logs or browser address bars. The "Decode" function of this tool converts these back into human-readable text instantly.

Supported Standards

This tool utilizes the browser's native `encodeURIComponent` and `decodeURIComponent` functions, which are fully compliant with ECMAScript standards and RFC 3986. This guarantees that the output works correctly in all modern browsers and backend servers (Node.js, Python, Java, etc.). It correctly handles Unicode characters and high-surrogate pairs (like emojis), preventing the common "malformed URI sequence" errors found in older tools.

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13:43
2025-12-28