URL Encoder / Decoder
Percent-encode your parameters to ensure perfect web and API reliability.
Calculator Settings
Total Breakdown
All About URL Encoder / Decoder
The URL Encoder / Decoder (Percent-encoding) is a critical utility for ensuring the reliability of web addresses and API requests. URLs can only contain a limited set of ASCII characters. Any special characters, spaces, or non-English symbols must be "percent-encoded" to ensure that web servers and browsers interpret the link correctly without errors. ### Why URL Encoding is Mandatory - **Character Compatibility**: Standardizing symbols like `&`, `=`, and `?` which have special meanings in URLs (query parameters) so they can be passed as actual data values. - **Global Character Support**: Allowing non-ASCII characters (like Korean, Arabic, or Emojis) to be part of a URL path or search query without breaking the link. - **Security & Integrity**: Preventing "URL Injection" or accidental truncation by ensuring that spaces and reserved characters are safely escaped during transmission. - **API Reliability**: Ensuring that data sent via GET requests or headers reaches the server exactly as it was sent, regardless of the server's platform. ### Common Use Cases - **Dynamic Search Queries**: Encoding user-generated search terms that may contain spaces or special characters before appending them to a URL. - **Redirect URL Management**: Passing a full destination URL as a parameter inside another URL (e.g., `?redirect=https%3A%2F%2Fsite.com`). - **REST API Parameterization**: Safely sending complex data strings, like email addresses or file paths, as part of a RESTful resource path or query. - **Social Sharing Links**: Creating custom "Tweet this" or sharing buttons that include pre-filled text with punctuation and symbols. ### Reliable Web Standards Our tool strictly follows RFC 3986 standards, providing instant and accurate conversion for all your web development needs. Whether you are debugging a complex tracking link or building a globalized web application, this utility ensures Your URLs are always 100% compliant and error-free.
How to Use This Tool
Input the 'Link' or 'Parameter String' you need to transform.
Choose 'Encode' to escape special characters, or 'Decode' to restore the human-readable text.
Check the 'Encoded' result for the characteristic '%' symbols used for escaping.
Copy the result for use in your browser address bar or code-based HTTP requests.
Practical Example
A space character is encoded as '%20' or '+' depending on the specific URL context.
Common Questions
Should I encode the entire URL?
Usually no. You should only encode the 'Value' part of query parameters. Encoding the 'http://' or domain part will make the link non-functional.
What characters are 'Reserved'?
Characters like :, /, ?, #, [, ], @, !, $, &, ', (, ), *, +, ,, ;, and = have special internal roles in URL structure.
Is URL encoding the same as Base64?
No. URL encoding is for escaping characters within a string; Base64 is for converting binary data into a text string. They serve completely different roles.
Why do spaces sometimes turn into '+'?
In the query string part of a URL (after the ?), a space is often replaced with '+'. In the path part, it is always '%20'.
Can URL encoding prevent hacking?
It helps prevent some basic interpretation errors, but it is not a substitute for proper input validation and security practices on the server side.