URL Encoder/Decoder

Our URL Encoder/Decoder helps you percent-encode text so it's safe to use inside a URL, or decode a percent-encoded string back to readable text. Both directions share one box, with instant results and clear error handling for malformed input.

How to Use the URL Encoder/Decoder Tool

1. Enter Your Text

• Type or paste plain text, a query parameter value, or a full URL
• Choose encode or decode
• View results instantly

2. Choose Operation

• Encode: Convert text into a percent-encoded, URL-safe string
• Decode: Convert a percent-encoded string back to plain text
• Copy results with one click

3. Handle Results

• View the converted output
• Copy to clipboard
• Malformed input is reported clearly instead of silently mangled

Key Features

Encoding Options

• Text and full URL support
• UTF-8 character support, including emoji and non-Latin scripts
• Instant, live conversion

Decoding Options

• Percent-encoded string to text conversion
• Malformed % sequence detection
• Clear error message instead of a thrown exception

Use Cases

1. Web Development

• Building a query string value that contains spaces, &, or ?
• Debugging a URL that looks garbled after being pasted from another system
• Preparing a redirect URL or webhook parameter for safe transport

2. API Work

• Encoding a value before appending it to a REST API query string
• Decoding a percent-encoded parameter received from a webhook or log line
• Checking exactly what a third-party service sent inside an encoded URL

3. General Troubleshooting

• Making sense of a URL copied from a browser address bar with encoded characters
• Verifying that a link shared on social media or in an email will resolve correctly
• Cleaning up a URL before sharing it in documentation

Technical Features

• UTF-8 Support: Full character set, not just ASCII
• RFC 3986 Encoding: Uses encodeURIComponent, the standard for URL path segments and query values
• Real-Time Processing: Instant results
• Error Handling: Malformed input detection with a readable message
• Clipboard Integration: Easy copying

Why Use Our URL Encoder/Decoder

1. User-Friendly Design

• One box, two clear actions
• Instant feedback
• Easy copying

2. Reliable Conversion

• Standards-based encoding, not a custom approximation
• Graceful handling of invalid % sequences
• Full UTF-8 support

3. Privacy Focused

• Client-side processing
• No data storage
• Offline capable once loaded

Understanding URL Encoding

What Is Percent-Encoding?

Percent-encoding (also called URL encoding) represents characters that aren't safe to use directly in a URL — spaces, &, ?, #, and non-ASCII characters — as a % followed by two hexadecimal digits representing that character's byte value. It lets arbitrary text travel safely inside a URL without breaking the URL's own structural characters.

encodeURIComponent vs. encodeURI

This tool uses encodeURIComponent, which encodes everything except letters, digits, and - _ . ! ~ * ' ( ) — the right choice when encoding a single value that will be placed inside a query string or path segment. The related encodeURI function leaves characters like /, :, and & untouched, since those are meant to preserve the structure of a complete URL rather than a single component.

Common Applications

1. Query Strings: Encoding a search term, email address, or free-text value before appending it to a URL
2. API Requests: Safely embedding parameters in REST endpoints
3. Form Data: Understanding how browsers encode submitted values
4. Log Analysis: Decoding encoded values found in server access logs

Best Practices

1. Encode Values, Not Whole URLs: Run encodeURIComponent on individual parameter values, not the full URL string, to avoid double-encoding structural characters like / and ?
2. Decode Once: Decoding an already-decoded string can corrupt data that legitimately contains a % character
3. Watch for Double-Encoding: If a decoded result still contains %XX sequences, the input was likely encoded twice
4. Validate Before Decoding: A malformed % sequence (not followed by two hex digits) will fail decoding — this tool reports that clearly instead of crashing

Remember: percent-encoding is a reversible transport format, not encryption or compression — encoded text is exactly as readable as the original once decoded, and typically a little longer.