URL Encoder/Decoder — Encode and Decode URLs Free in Your Browser

URLs have strict rules about which characters are allowed. Characters like spaces, &, =, +, and non-ASCII characters must be percent-encoded before they can be used in a URL. SimpleTools URL Encoder/Decoder handles both directions instantly — encode special characters for safe transmission or decode encoded URLs to human-readable form.

What Is URL Encoding?

URL encoding (also called percent encoding) replaces unsafe characters with a % followed by their hexadecimal code point. For example:

• Space → %20
• & → %26
• = → %3D
• + → %2B
• @ → %40
• / → %2F
• Non-ASCII characters like é → %C3%A9 (UTF-8 bytes)

This ensures that the URL is unambiguous — characters that have structural meaning in URLs (like & and = in query strings) don’t get confused with literal data.

Two Encoding Modes

Full URL encoding (encodeURI): Encodes a complete URL, preserving the URL structure characters (/, :, ?, &, =, #). Use this when you have a full URL that needs encoding.

Component encoding (encodeURIComponent): Encodes a URL component (like a query parameter value), encoding ALL special characters including &, =, and ?. Use this for individual query parameter values.

Example:

Input: https://example.com/search?q=hello world&lang=en
encodeURI: https://example.com/search?q=hello%20world&lang=en
encodeURIComponent: https%3A%2F%2Fexample.com%2Fsearch%3Fq%3Dhello%20world%26lang%3Den

Features

• Encode URL: Full URL or component mode
• Decode URL: Decode any percent-encoded string
• Auto-detect: Identify whether input is encoded or plain text
• Live conversion: Encodes/decodes as you type
• Form data encoding: Encode data for application/x-www-form-urlencoded format (+ for spaces)
• Copy output: One-click copy of the result
• Batch mode: Encode/decode multiple values at once

Why Use a Browser-Based Encoder?

URL parameters sometimes carry sensitive values — authentication tokens, session IDs, user identifiers. Processing these in a local browser tool is more secure than sending them to a cloud API.

SimpleTools URL Encoder:

✅ Your URLs and values never leave your browser
✅ Works offline
✅ No logs, no tracking
✅ Free forever

How It Works

JavaScript has built-in URL encoding functions:

// Encode a full URL (preserves URL structure)
encodeURI('https://example.com/search?q=hello world');
// "https://example.com/search?q=hello%20world"

// Encode a URL component (encodes everything)
encodeURIComponent('hello world & more');
// "hello%20world%20%26%20more"

// Decode percent-encoded string
decodeURIComponent('hello%20world%20%26%20more');
// "hello world & more"

The tool wraps these native browser functions and handles edge cases like invalid encoding sequences, double-encoding, and mixed encoding.

How to Use the URL Encoder/Decoder

1. Visit simpletools.one/url-encoder
2. Paste your URL or text in the input field
3. Select Encode or Decode
4. Choose encoding mode: Full URL or Component
5. The result appears instantly
6. Click Copy to copy the output

Common Use Cases

API development: Encode query parameter values when building API request URLs by hand.

Decoding log entries: Application logs often contain percent-encoded URLs — decode them to understand the original request.

Form submissions: Debug application/x-www-form-urlencoded POST body data by decoding the encoded form values.

OAuth/authentication: OAuth callback URLs and state parameters are often double-encoded — decode layer by layer to inspect.

i18n URLs: Encode non-ASCII characters in internationalized URLs containing accented characters, Chinese, Arabic, etc.

Quick Reference

Encode and decode URLs at simpletools.one/url-encoder — instant, private, and completely free.