Developer Tool

URL Encoder & Decoder

Instantly encode text to URL-safe format, or decode percent-encoded strings back to readable text. Fast, secure, and strictly client-side.

Input Text to Encode

Options

Full URL EncodingOff: Uses encodeURIComponent() - encodes all characters including / ? & #.
On: Uses encodeURI() - preserves URI structure characters like / ? & #.

Output Encoded URL

Waiting for input...

About the URL Encoder & Decoder

The Neuctra Tools URL utility is designed for developers who need to encode or decode text for safe transmission over the Internet. URL encoding (also known as percent-encoding) replaces unsafe characters with a "%" followed by two hexadecimal digits, ensuring your data can be safely used in URLs, query parameters, and form submissions.

By processing everything on the client side via the browser's native Web APIs, your data remains completely private. Whether you're encoding query parameters for an API call, or decoding a URL-encoded payload, nothing is ever uploaded to a remote server.

Common Use Cases

API Query Parameters

Encode special characters in query parameters to ensure they are properly transmitted to APIs. Special characters like spaces, ampersands, and question marks must be encoded.

Form Data Submission

Encode form field values to safely transmit user input via HTTP GET or POST requests. URL encoding prevents injection attacks and data corruption.

Internationalized URLs

Encode non-ASCII characters (like é, ñ, or 中文) in URLs to ensure they work across all browsers and systems that only support ASCII.

Data URL Generation

Encode text-based resources like CSS, HTML, or JSON for use as data URLs (data:text/plain;charset=utf-8,encoded-content).

Understanding URL Encoding

What gets encoded?

Reserved characters: ; , / ? : @ & = + $
Unsafe characters: (space), < > " # % | \ ^ ~ [ ]
Non-ASCII characters: Any character above 127 (like á, ü, 漢) gets encoded as UTF-8 byte sequence

Common Encodings

space→ %20

!→ %21

"→ %22

#→ %23

$→ %24

%→ %25

No. All encoding and decoding is performed locally inside your browser using JavaScript Web APIs. Your sensitive data never leaves your device.

URL encoding (also known as percent-encoding) converts characters into a format that can be transmitted over the Internet. It replaces unsafe ASCII characters with a '%' followed by two hexadecimal digits.

URL encoding is essential when you need to include special characters (like spaces, &, ?, #) in URLs or query parameters. It ensures the URL remains valid and is interpreted correctly by web servers.

Encoding converts special characters to their percent-encoded format (e.g., space becomes %20). Decoding reverses this process, converting percent-encoded strings back to their original characters.