Free URL Encoder & Decoder Online

What is URL Encoding?

URL encoding (also called percent-encoding) is the process of converting characters into a format that can be safely transmitted in a URL. Special characters like spaces, ampersands, and non-ASCII characters are replaced with percent-encoded equivalents (e.g., space becomes %20).

This is essential for building valid URLs with query parameters, form submissions, API calls, and any data that travels through HTTP. Our tool supports both encodeURIComponent (for encoding individual parameters) and encodeURI (for encoding full URLs while preserving structural characters).

Key Features

Two Encoding Modes

Component mode for query params, Full URI mode for complete URLs.

100% Private

All encoding/decoding happens in your browser. No data leaves your device.

Unicode Support

Handles international characters, emojis, and multi-byte UTF-8 sequences.

Swap & Copy

One-click swap between encode/decode and instant clipboard copy.

Frequently Asked Questions

What's the difference between Component and Full URI mode?

Component mode (encodeURIComponent) encodes everything including /, ?, &, and =. Use this for individual query parameter values. Full URI mode (encodeURI) preserves URL structure characters, encoding only spaces and special characters within the URL.

When should I URL-encode strings?

Encode when passing user input as URL query parameters, building API requests with special characters, or when data contains spaces, ampersands, or non-ASCII characters that could break URL parsing.

Why does space become %20 instead of +?

Percent-encoding uses %20 for spaces (RFC 3986). The + notation for spaces is specific to application/x-www-form-urlencoded format (HTML forms). Both are valid in different contexts.

Is this tool secure?

Yes. All processing happens entirely in your browser. No data is ever sent to a server. Your URLs and parameters remain completely private.

About the URL Encoder / Decoder

The URL Encoder / Decoder is a free online tool that lets you encode and decode URL components and query strings. It runs entirely in your browser with no sign-up required, so you get instant results while your data stays on your device. It is built for developers, designers, and anyone who needs a fast, reliable url encoder / decoder without installing software.

Frequently asked questions

Is the URL Encoder / Decoder free to use?

Yes. The URL Encoder / Decoder is completely free with no account, sign-up, or installation required.

Is my data private when I use the URL Encoder / Decoder?

This tool runs entirely in your browser. Your data is never uploaded to a server, which makes it safe to use with sensitive input.

Do I need to install anything?

No. The URL Encoder / Decoder works in any modern web browser on desktop or mobile, with nothing to download.

Can I use the URL Encoder / Decoder on mobile?

Yes. The tool is responsive and works on phones, tablets, and desktops.

Free Online URL Encoder / Decoder