Easily encode unsafe characters in URLs with Qodex’s URL Encoder. This tool ensures your links are safely formatted for web use. Combine it with the URL Decoder to reverse changes, or use it alongside UTF8 Encoder and Base64 Encoder for advanced encoding tasks.
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Regular Expression - Documentation
Introduction
When sending URLs over the internet—whether in forms, APIs, or query strings—some characters can break the structure or introduce security risks. That’s where URL encoding steps in. It converts special characters into a format that can be safely transmitted over HTTP.
What is URL Encoding?
URL Encoding (also called percent-encoding) replaces unsafe characters with a % followed by two hexadecimal digits. For example:
Space becomes %20
/ becomes %2F
: becomes %3A
& becomes %26
This ensures URLs are interpreted correctly by browsers, APIs, and servers.
How Does It Work?
Under the hood:
The tool scans your input for characters not allowed in a URL.
It converts each unsafe character into its ASCII code in hexadecimal.
It prepends % to the hex value and returns the fully encoded string.
This is based on RFC 3986, which defines which characters are reserved or unreserved in a URI.
Practical Examples
Example 1: Query string in a GET request
Original:
https://example.com/search?query=hello world
Encoded:
https://example.com/search?query=hello%20world
Example 2: Email as a query parameter
Original:
mailto:user@example.com
Encoded (for safe inclusion in a URL):
mailto:user%40example.com
Example 3: Text with symbols
Original:
50% discount at Café Déjà Vu!
Encoded:
50%25%20discount%20at%20Caf%C3%A9%20D%C3%A9j%C3%A0%20Vu%21
Use Cases
Encoding data in web forms
Making URLs safe for API calls
Preventing broken links due to special characters
Encoding redirect URLs
Preparing OAuth or token-based requests
How to Use the Qodex URL Encoder
Paste your URL or text in the input box.
Click “Encode”.
Instantly copy the encoded version.
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Pro Tips
Always encode query parameters separately to avoid breaking the base URL.
Use double encoding if your parameter already contains an encoded string.
Combine with the URL Decoder for testing bidirectional conversions.
Encoding can prevent XSS when user data is injected into links.
Reserved characters (?, =, &) should be encoded only if they’re part of the data, not the structure.
