What is a URL Encoder Online?

A URL encoder online is a browser-based tool that converts any text or URL into percent-encoded format — instantly, without installing anything. You paste your raw URL or query string, click encode, and get back a URL-safe string ready to use in your application or API request.

URLs can only contain a limited set of safe ASCII characters — letters (A–Z, a–z), digits (0–9), and a few symbols (-, _, ., ~). Every other character must be percent-encoded: replaced with a % followed by two hex digits. This process is formally called percent-encoding, standardized in RFC 3986 by the IETF.

For example, a space becomes %20, a + becomes %2B, and / becomes %2F. Any reliable URL encoder online handles all of these automatically.

How Percent-Encoding Works — The Rules Every URL Encoder Uses

The formula is simple: take the ASCII or UTF-8 byte value of the character, convert it to hexadecimal, and prefix with %. Every URL encoder online applies this same rule — the difference is which characters it encodes by default.

When to Encode vs Decode — Choosing the Right Direction

URL Encoding in Code — JavaScript, Python, PHP

Every major language has a built-in URL encoder. Use these instead of a manual URL encoder online when you need to encode dynamically at runtime.

JavaScript — Three Functions You Must Know

    
JavaScript — URL EncoderCopy
    // ✅ Encode a query parameter value
const query = "hello world & more";
const encoded = encodeURIComponent(query);
// → "hello%20world%20%26%20more"

// ✅ Build a URL safely with URLSearchParams
const base = "https://example.com/search";
const params = new URLSearchParams({
  q: "hello world",
  lang: "urdu",
  page: 1
});
const url = `${base}?${params.toString()}`;
// → https://example.com/search?q=hello+world&lang=urdu&page=1

// ✅ Decode a URL parameter
const raw = "hello%20world%20%26%20more";
const decoded = decodeURIComponent(raw);
// → "hello world & more"

// ✅ Parse URL parameters from current page
const urlParams = new URLSearchParams(window.location.search);
const searchQuery = urlParams.get('q'); // Already decoded!
  

Python — URL Encoder

    
Python — URL EncoderCopy
    from urllib.parse import quote, unquote, urlencode, urljoin

# Encode a query string value with Python
query = "hello world & more"
encoded = quote(query, safe='')
# → "hello%20world%20%26%20more"

# Decode a percent-encoded string
decoded = unquote("hello%20world%20%26%20more")
# → "hello world & more"

# Build URL with query parameters
params = {'q': 'hello world', 'lang': 'urdu', 'page': 1}
query_string = urlencode(params)
url = f"https://example.com/search?{query_string}"

# Encode non-ASCII (Arabic text)
arabic = "مرحبا"
enc_arabic = quote(arabic)
# → "%D9%85%D8%B1%D8%AD%D8%A8%D8%A7"
  

PHP — URL Encoder

    
PHP — URL EncoderCopy
    // PHP — urlencode vs rawurlencode
$query = "hello world & more";
$encoded = urlencode($query);
// → "hello+world+%26+more" (spaces become +)

$encoded_raw = rawurlencode($query);
// → "hello%20world%20%26%20more" (spaces become %20)

// Decode
$decoded = urldecode($encoded);
$raw_decoded = rawurldecode($encoded_raw);

// Build a URL safely
$params = ['q' => 'hello world', 'lang' => 'urdu'];
$url = 'https://example.com/search?' . http_build_query($params);
  

Common URL Encoding Mistakes to Avoid

Even experienced developers make these errors. A good tool handles them automatically — but you need to understand them when coding manually.

Frequently Asked Questions

Here are the most common questions developers ask about URL encoding.