About URL & Query String Encoder / Decoder
Safely percent-encode special characters in URLs, query strings, and webhook payloads, or decode %20, %2F, and %3F sequences back into clean human-readable text.
Key Capabilities & Features
- Dual mode: encodeURIComponent (query parameters) and encodeURI (full URLs)
- Handles international multi-byte UTF-8 character sequences
- Instant swap between input and output
- Real-time live conversion
- 1-Click copy to clipboard
How to Use URL & Query String Encoder / Decoder
Select Action
Choose Percent-Encode or Decode Percent-Encoding.
Input URL
Paste the web address, query parameter, or webhook string.
Copy Result
Copy the encoded or decoded URL output.
Privacy & In-Browser Execution Guarantee
Executed locally inside your browser. Zero data sent to any remote server.
Frequently Asked Questions
What is the difference between encodeURI and encodeURIComponent?
encodeURI preserves protocol markers like 'https://' and '/', whereas encodeURIComponent encodes all special characters, making it ideal for query string parameters.
Why do spaces become %20 instead of +?
%20 is the official RFC 3986 percent-encoding standard for URLs, whereas '+' is traditionally used only in HTML application/x-www-form-urlencoded forms.
What causes URI malformed decode errors?
A malformed error occurs when an isolated '%' character is not followed by two valid hexadecimal digits, violating percent-encoding syntax.