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URL Encoder / Decoder

Convert reserved special characters into standardized percent-encoded strings or decode escaped query parameters instantly using a privacy-focused, browser-based URL encoder decoder online tool.

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How to Use This Tool

Converting plain text into URI-safe strings or decoding escaped URL parameters is straightforward with our browser-based percent encoding tool:

  • Input String or URL: Enter or paste raw strings, query parameters, or encoded web addresses into the input area. You can also click Sample URL to populate a test string or Upload Text to load a file.
  • Configure Encoding Mode: Choose encodeURIComponent for individual query key-value pairs, encodeURI to preserve structural URL delimiters like slashes and colons, or RFC 3986 for strict compliance.
  • Set Space Encoding Rule: Toggle between standard percent-encoding (%20) or application form POST-data style (+).
  • Execute Transformation: Click Encode to online url escape special characters, or click Decode to url decode string data back into human-readable text.
  • Copy or Export Result: Instantly copy the output to your clipboard or download it as a plain text file for incorporation into API payloads or configuration files.

Understanding Percent Encoding, URL Safety, and Query Parameters

Uniform Resource Identifiers (URIs) and URLs rely on a restricted set of ASCII characters to represent address locations across web networks. When passing arbitrary data, search queries, authentication tokens, or JSON strings through HTTP GET parameters, non-ASCII characters or reserved structural characters (such as ?, &, =, /, and space) must be translated into an escaped format. This process is called percent-encoding or URL escaping, governed by RFC 3986 specifications.

A reliable url encoder decoder online utility allows software developers and web administrators to convert sensitive characters into a triplets format consisting of a percent character (%) followed by two hexadecimal digits representing the character's UTF-8 byte encoding (for example, a space becomes %20 and an ampersand becomes %26).

When you need to url encode query params, it is critical to distinguish between full URI encoding and component encoding:

  • encodeURI: Encodes characters while preserving structural protocol characters such as http://, /, ?, and #. Use this when escaping a complete web address without breaking its routing structure.
  • encodeURIComponent: Encodes all reserved characters including slashes, question marks, and ampersands. Use this when escaping data values assigned to query parameters (e.g., https://example.com/search?query=val).
  • RFC 3986 Strict Encoding: Standard JavaScript methods leave characters like !, ', (, ), and * unescaped. Strict mode ensures even these characters are percent-encoded for maximum cross-platform compatibility.

Using an online url escape and decoding tool eliminates syntax errors in API integrations, prevents query string parameter injection, and helps troubleshoot escaped payload issues directly inside your browser.