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URL Encoder / Decoder

Encode or decode URLs and query parameters for safe transmission.

Input
Output

      

      

    

  

    
Overview
Encode or decode URLs so special characters travel correctly.
Best for
  • Build query strings with spaces or symbols.
  • Decode tracking links to read parameters.
  • Encode query parameters before sharing links.
Step-by-step
  1. Choose encode or decode mode.
  2. Paste the URL or component.
  3. Copy the normalized result.
Examples

        
Example 1

        

          

            
Input

            
hello world

          

          

            
Output

            
hello%20world

          

        

        
Spaces become %20.

      

        
Example 2

        

          

            
Input

            
q=ai%20tools&lang=zh

          

          

            
Output

            
q=ai tools&lang=zh

          

        

        
Decoded parameters are readable.

      

        
Example 3

        

          

            
Input

            
name=alice & bob

          

          

            
Output

            
name=alice%20%26%20bob

          

        

        
Spaces and & are safely encoded.

      
Common mistakes
  • Encoding the whole URL vs a component uses different rules.
  • Double-encoding breaks links.
  • Encoding the full URL when you only need a parameter.
Pro tips
  • Encode only parameter values when possible.
  • Test the link in a browser.
FAQ
Why does + appear for spaces?
In query strings, spaces may be encoded as '+'; %20 is also valid.
Does this upload my data?
No. Everything runs locally in your browser.
Can I use it offline?
Yes. After the page loads, most tools work offline. Some assets (like fonts) may need a connection.
Data & privacy
All processing happens locally in your browser. No data is uploaded or stored.