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URL Encoder Developer Guide
100% Client-Side & Private
Prepare URL-safe values or inspect encoded query components without sending the URL content to a remote service.
Key capabilities
Encodes special characters, spaces, and symbols into standard RFC 3986 percent-encoding
Decodes complex percent-encoded strings back into readable UTF-8 text
Differentiates between full URI encoding and URI component encoding
Instant, deterministic client-side transformation
Common use cases
Encoding URL query parameters to avoid breaking links with ampersands and question marks
Decoding redirect URLs and OAuth state parameters during debugging
Preparing safe callback URLs and deep links for mobile and web applications
How to use URL Encoder
Choose Encode or Decode mode depending on your workflow
Enter the URL or string fragment in the input area
Copy the correctly percent-encoded or decoded output instantly
Frequently asked questions
What is the difference between encodeURI and encodeURIComponent?
encodeURI preserves URL structure characters like / and : while encodeURIComponent encodes everything except alphanumeric characters and -_.!~*'(), making it ideal for query parameter values.