String Flux

URL Encode Online - Free & Privacy First Encoder | StringFlux

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ABOUT URL ENCODE

This page provides a specialized tool for URL encoding. URL encoding (also known as percent-encoding) is a method to encode special characters in URLs to make them safe for transmission over the internet. This is essential for web development, API requests, and any situation where data needs to be included in a URL.

The URL Encode tool converts special characters like spaces, ampersands, question marks, and other non-ASCII characters into their percent-encoded equivalents. For example, a space becomes %20, an ampersand becomes %26, and so on. This ensures that URLs remain valid and can be properly interpreted by web servers and browsers.

As part of StringFlux, this tool can be chained with other operations for more complex transformations. For instance, you can URL encode a string and then encode it to Base64, or decode a URL-encoded string and then format it as JSON. If you need to decode URL-encoded strings instead, check out our URL Decode Tool.

FAQ

When should I use this URL encoder tool?

Use URL encoding when you need to safely transmit characters in URLs or HTTP requests that would otherwise be misinterpreted. Common use cases include:

  • • Encoding query string parameters (name=John Doe → name=John%20Doe)
  • • Preparing form submissions (application/x-www-form-urlencoded)
  • • Escaping reserved characters (?, &, =, /) in URLs
  • • Encoding data for redirects, cookies, or API requests

What encoding standard is used?

This tool follows the percent-encoding rules from RFC 3986 and uses UTF-8 character encoding:

  • • Reserved characters (/, ?, &, =, etc.) are percent-encoded unless they serve a structural role in the URL.
  • • Spaces are encoded as %20.
  • • Non-ASCII characters (e.g., ✓, 漢字) are UTF-8 encoded and then percent-encoded.

Is my data safe when encoding URLs here?

Yes. All processing occurs locally in your browser. Your input is never sent to a server, stored, or logged.

Do you support reserved characters like + and %?

Yes.

  • • A space is encoded as %20.
  • • The + symbol itself is encoded as %2B to avoid ambiguity.
  • • The % character is encoded as %25.

Can I see examples of URL encoding?

Yes. Here is one example:

Original string:

http://stringflux.io/?name=John&city=Fremont

When you encode it with this tool, you’ll get:

http%3A%2F%2Fstringflux.io%2F%3Fname%3DJohn%26city%3DFremont

Try this shared URL encoding example.

FEATURES

Transformation Chains

Chain multiple operations to perform complex transformations, similar to a command line pipe.

Privacy First

All string transformations happen purely on the browser side, ensuring your data never leaves your device.

Intuitive UX

Simple and intuitive UX to provide operation in 3 ways: recommended by content type, search and category.

Share & Collaborate

Share your string transformation chain with others using share links.