Free URL Encoder / Decoder
Encode and decode URL components instantly with this free online tool. Safely convert special characters for query strings, APIs, and redirects — everything runs 100% client-side, so your text never leaves your device.
URL Encoder / Decoder
URL Encoder / Decoder FAQ
What is URL encoding?
It’s a method of converting characters into a format that can be safely transmitted in URLs using percent-encoding.
When should I use URL encoding?
Use encoding when passing special characters (spaces, symbols, unicode) in query strings, parameters, or API calls.
What characters are encoded?
Reserved characters like ?, =, &, %, /, spaces, and non-ASCII characters are replaced with percent-encoded values.
What is the difference between encodeURI and encodeURIComponent?
`encodeURI` leaves URL parts like `?` and `&` untouched, while `encodeURIComponent` encodes everything, making it safer for query parameters.
Is decoding safe?
Yes, decoding simply reverses percent-encoded values back to their original characters. Just make sure the input is valid.
What is URL Encoding?
URL Encoding & Decoding (Percent-Encoding)
URL encoding, also known as percent-encoding, is a mechanism that ensures special characters can be safely transmitted inside a URL. Certain characters have reserved meanings in URLs (like ?, =, or &), so encoding replaces them with a % symbol followed by their two-digit hexadecimal ASCII value.
For example:
| Character | Purpose | Encoded |
|---|---|---|
? | Separates query string | %3F |
= | Assigns values | %3D |
& | Separates parameters | %26 |
space | Whitespace in URLs | %20 or + |
Why Encoding is Needed
- Reserved characters: Symbols like
?or&have special meanings in query strings and must be encoded to appear as literal text. - Unsafe characters: Some characters (e.g., spaces, quotes, brackets) are not valid in URLs and must be encoded.
- Non-ASCII data: Unicode characters must be percent-encoded so browsers and servers interpret them correctly.
Decoding
URL decoding reverses the process by converting percent-encoded sequences back to their original characters. For example:
Encoded: https://example.com/search?q=Hello%20World%21 Decoded: https://example.com/search?q=Hello World!
Decoding is essential when processing query strings, form data, or API requests where parameters must be read as human-readable values.
Common Use Cases
- Encoding query parameters in GET requests.
- Safely embedding data in URLs, links, and redirects.
- Handling OAuth tokens or API keys in headers or query strings.
- Making user input (e.g., search queries) safe for transmission.
About This Tool
This URL Encoder/Decoder allows you to instantly convert between plain text and percent-encoded strings. Everything is processed locally in your browser, ensuring:
- No data is ever transmitted to a server.
- 100% privacy and security.
- Instant results with no dependencies.
Whether you're debugging query strings, securing API requests, or working with redirects, this tool provides a fast, reliable way to encode and decode URLs safely. Just remember: Encoding ≠ Encryption — it protects formatting, not data secrecy.