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URL Encoder/Decoder

Encode and decode URLs

URL Encoder / Decoder

Switch between encode and decode modes to transform text for safe URL usage or back to readable form.

Encoded/decoded output will appear here
URL Encoder / Decoder

Encode & Decode URLs Safely with a Single Click

Use this URL Encoder/Decoder tool to convert text into URL-safe format or decode already encoded URLs. Perfect for developers working with query strings, redirects, APIs, and web integrations.

Safe URL Encoding

Convert special characters into URL-safe sequences using encodeURIComponent, so your text works correctly in query params, redirects, and dynamic links.

One-Click Decode

Take encoded URLs like hello%20world%3F and decode them back to readable text using decodeURIComponent for easier debugging and review.

Error Handling Built-In

Invalid encoded strings are gracefully handled with a helpful error message instead of breaking the page or throwing cryptic browser errors.

What is URL Encoding?

URL encoding converts characters into a format that can be safely transmitted in URLs. Spaces, symbols, and non-ASCII characters are replaced by percent-encoded sequences like %20, %3F, and others. This prevents browsers and servers from misinterpreting those characters as control symbols or delimiters.

This tool helps you both encode raw text for use in URLs and decode already encoded values when debugging or reading query strings, making it easier to work with redirects, OAuth callbacks, and API request logs.

How the URL Encoder / Decoder Works

  1. In Encode mode, your input text is passed through the native JavaScript function encodeURIComponent.
  2. This function replaces unsafe characters (spaces, &, ?, =, /, non-ASCII, etc.) with percent-encoded sequences such as %20 or %3D.
  3. In Decode mode, the tool uses decodeURIComponent to reverse the process and rebuild the original human-readable text from the encoded string.
  4. If decoding encounters an invalid percent-encoded sequence, the tool catches the error and displays a friendly message instead of crashing the page.
  5. All logic runs client-side in your browser using standard web APIs.

How to Use this URL Encoder / Decoder

  1. Select whether you want to Encode or Decode using the mode buttons.
  2. Paste or type your text into the Input area. For encode mode, this is normal text; for decode mode, this is an encoded URL string.
  3. The output is generated automatically as you type and appears in the Output panel beneath.
  4. If you want to flip the direction, click the swap button – the current output becomes the new input and the mode toggles.
  5. Use the Copy Output button to copy the result to your clipboard for use in code, logs, or browser address bars.

Common Use Cases

  • Encoding search terms, filters, or user input into query parameters before redirecting.
  • Decoding redirect or callback URLs when inspecting logs or debugging OAuth flows.
  • Checking how frameworks and libraries encode specific strings for URLs.
  • Debugging API requests that use encoded query strings or path segments.
  • Preparing safe URLs for frontend links, buttons, and client-side routing.

Privacy & Safety Disclaimer

All encoding and decoding happens entirely in your browser using built-in JavaScript functions. Your input is not uploaded, logged, or stored on any server by this tool. For highly sensitive data such as access tokens or personal identifiers, always follow your organization's security policies and avoid sharing or storing encoded URLs in unsafe places.

FAQ – URL Encoder / Decoder Tool

1. What's the difference between encoding and decoding?

Encoding converts readable text into a URL-safe format. Decoding reverses that process, turning encoded text back into human-readable form.

2. When should I use URL encoding?

Whenever you insert dynamic text into URLs (for example, search queries, user names, or filter values), you should encode it to avoid breaking the URL or misinterpreting special characters.

3. Why do I sometimes see errors when decoding?

decodeURIComponent expects valid percent-encoded sequences. If the string is partially encoded or incorrectly formatted, decoding can fail – this tool will show a clear error message instead of crashing the page.

4. Is this safe for production URLs?

The underlying functions (encodeURIComponent and decodeURIComponent) are the same ones used in real web applications, so the output matches what you'd see in actual code.