URL Encoder Guide
What is URL Encoding?
URL encoding, also known as percent encoding, is a mechanism for encoding information in URLs by replacing unsafe ASCII characters with a "%" followed by two hexadecimal digits. This encoding ensures that URLs containing special characters can be safely transmitted over the internet without being misinterpreted by web browsers, servers, or other systems.
URLs can only contain a limited set of characters from the ASCII character set. Characters outside this set, or characters that have special meaning in URLs (like spaces, &, ?, #), must be encoded to prevent conflicts with URL syntax and ensure proper transmission across different systems and protocols.
Why URL Encoding is Necessary
- • URLs can only safely contain certain ASCII characters
- • Special characters have reserved meanings in URL syntax
- • Different systems may interpret unencoded characters differently
- • Ensures reliable data transmission across all platforms
- • Prevents broken links and server errors
Reserved and Unsafe Characters
Reserved Characters (Have Special Meaning)
Character → Encoded
- Space → %20
- ! → %21
- # → %23
- $ → %24
- % → %25
- & → %26
- ' → %27
- ( → %28
- ) → %29
- * → %2A
- + → %2B
- / → %2F
Unsafe Characters (Control/Non-Printable)
- : → %3A
- ; → %3B
- < → %3C
- = → %3D
- > → %3E
- ? → %3F
- @ → %40
- [ → %5B
- \ → %5C
- ] → %5D
- ^ → %5E
- ` → %60
Safe Characters (No Encoding Needed)
These characters can be used in URLs without encoding:
A-Z a-z 0-9 - _ . ~
How to Use Our URL Encoder
Encoding URLs
1. Select "Encode" mode in the tool
2. Enter your URL or text with special characters
3. Click "Encode" to generate percent-encoded result
4. Copy the encoded URL for use in web applications
Decoding URLs
1. Select "Decode" mode in the tool
2. Paste the percent-encoded URL
3. Click "Decode" to reveal the original characters
4. View the human-readable version of the URL
Common Use Cases
Query Parameters
Encoding values passed in URL query strings to handle spaces, special characters, and non-ASCII text.
Before: ?search=Hello World&filter=price > 100
After: ?search=Hello%20World&filter=price%20%3E%20100
Form Data Submission
HTML forms automatically encode data, but manual encoding is needed for AJAX requests and API calls.
- • POST request body encoding
- • AJAX form submissions
- • API parameter passing
- • File upload parameters
API Integration
Properly encoding parameters when making HTTP requests to APIs.
- • REST API query parameters
- • OAuth callback URLs
- • Webhook URL parameters
- • Search API queries