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Guide

How to use this tool, examples, and related tips.

How to Use the URL Encode / Decode Tool

Paste your string into the input field.

Click Encode to percent-encode special characters, or Decode to convert percent-encoded sequences back to their original characters.

Copy the output for use in URLs, query strings, or API requests.

What Is URL Encoding?

URL encoding — formally called percent-encoding — replaces characters that are not permitted in URLs with a % followed by their two-digit hexadecimal ASCII code. For example, a space becomes %20, & becomes %26, and = becomes %3D. This is necessary because URLs have a defined syntax where certain characters carry structural meaning (separating query parameters, for instance) and others are simply not valid. URL decoding reverses the process, converting percent-encoded sequences back to their original characters for readability or processing.

When to Use This Tool

Constructing query strings — Encode parameter values that contain special characters before appending them to a URL.

Debugging malformed URLs — Decode a percent-encoded URL to read it clearly and identify where encoding has gone wrong.

Working with OAuth and API authentication — Many OAuth flows require precisely encoded redirect URIs and scope strings.

Handling user input in URLs — Encode user-supplied strings before embedding them in URLs to prevent injection or broken links.

Related Tools

  • URL encoder
  • URL decoder
  • URL parser
  • Slug generator
  • HTML encoder

FAQ

Answers about this tool and how your data is handled.

What is the difference between encodeURI and encodeURIComponent in JavaScript?

encodeURI encodes a full URL and leaves structural characters like /, ?, and & intact. encodeURIComponent encodes a single component (e.g., a query parameter value) and percent-encodes those structural characters too. This tool encodes a string as a component — equivalent to encodeURIComponent.

Should I encode the entire URL or just parts of it?

Encode individual components — query parameter keys and values, path segments, fragment identifiers — not the full URL. Encoding the entire URL will break its structure by encoding the ://, /, and ? characters.

Does this tool send my data to a server?

No. Encoding and decoding run entirely in your browser. Nothing is uploaded.

What characters are not encoded?

Unreserved characters — letters (A–Z, a–z), digits (0–9), and -, _, ., ~ — are never percent-encoded, per RFC 3986.

Is URL encoding the same as HTML encoding?

No. They target different characters and use different syntax. URL encoding uses %XX sequences; HTML encoding uses entity references like &. Use the right tool for the context.

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