URL Encoder and Decoder Online — Free Guide

Broken URLs are a daily annoyance — spaces in query params, ampersands in values, Unicode in paths. Percent-encoding (URL encoding) fixes it, but encodeURI vs encodeURIComponent trips up even experienced developers.

What is URL encoding?

URL encoding replaces unsafe characters with % followed by two hex digits. A space becomes %20, & becomes %26, and non-ASCII characters become UTF-8 byte sequences (e.g. é → %C3%A9).

Without encoding, special characters break query parsing, routing, and API clients.

encodeURI vs encodeURIComponent

Rule of thumb: encode individual parameter values with encodeURIComponent. Use encodeURI only when encoding a mostly-complete URL string.

Example

Base URL:     https://api.example.com/search
Query param:  q=hello world&lang=en

Correct: https://api.example.com/search?q=hello%20world&lang=en Wrong: encodeURI("hello world") on just the value — use encodeURIComponent ```

Encode and decode in your browser

The VyomaStack URL Encoder runs 100% locally:

1. Paste a URL or query string into the input 2. Choose encodeURIComponent or encodeURI mode 3. Click Encode or Decode 4. Copy the result or swap input/output for chained fixes

Nothing is sent to a server.

Common URL encoding bugs

• Double encoding — %2520 instead of %20 when you encode already-encoded text
• Encoding the whole URL with encodeURIComponent — breaks :// and /
• Plus vs space — HTML forms send spaces as +; decodeURIComponent handles both
• Unicode in paths — modern browsers encode automatically; APIs may not

When you need a URL encoder

• Debug REST API calls with special characters in filters
• Fix broken redirect links from analytics or email tools
• Decode log lines with percent-encoded request paths
• Build query strings for curl or Postman by hand

URL encoder vs JavaScript one-liner

javascript
encodeURIComponent("hello world");  // "hello%20world"
decodeURIComponent("hello%20world"); // "hello world"

The browser tool is faster when you're already debugging JSON, SQL, or JWT in VyomaStack — copy button included, no DevTools console.

Related tools

• Base64 Encoder — different encoding for binary/text payloads
• JSON Formatter — validate API bodies before URL-encoding fields
• QR Code Generator — encode URLs into scannable codes

Try it free

Encode and decode URLs instantly — no account, no server upload.