Zolkit

URL Encoder / Decoder

Encode and decode URLs or individual components in real time using JavaScript's native URI functions. Private, instant, free.

Encode & Decode URLs Instantly

URL encoding (percent-encoding) replaces unsafe ASCII characters with a '%' followed by two hexadecimal digits. This ensures URLs remain valid across all browsers, servers, and platforms. Zolkit's encoder/decoder runs entirely in your browser using JavaScript's native encodeURIComponent and decodeURIComponent functions.

Real-Time Processing

Output updates instantly as you type — no button needed.

Two Modes

Component mode encodes/decodes individual query parameters. Full URL mode preserves the URL structure while encoding/decoding the necessary parts.

100% Private

All processing happens locally. Your URLs and data never leave your browser.

Standards-Compliant

Uses JavaScript's native encodeURIComponent and encodeURI, which follow RFC 3986.

Handles Edge Cases

Correctly encodes multibyte Unicode characters, special symbols, and spaces. Use Component mode for query parameters and Full URL mode for complete addresses.

Instant Copy

Copy the result to your clipboard with a single click.

How to Encode or Decode a URL

  1. 1

    Choose Encode or Decode mode and select Component (for query parameters) or Full URL.

  2. 2

    Paste your text or URL into the Input field. The result appears instantly in the Output field.

  3. 3

    Click Copy to copy the result to your clipboard.

Frequently Asked Questions

What is URL encoding?

URL encoding (percent-encoding) converts characters that are not allowed or have special meaning in URLs into a '%' followed by their hexadecimal ASCII value, e.g. a space becomes %20.

What is the difference between Component and Full URL mode?

Component mode uses encodeURIComponent, which encodes almost all characters including '/', '?', '#', and '&'. Full URL mode uses encodeURI, which preserves the structural characters of a URL such as '://', '/', '?', '#', and '&'.

When should I use Component mode?

Use Component mode when encoding individual query parameter values or path segments, for example when building a URL programmatically: key=encodeURIComponent(value).

When should I use Full URL mode?

Use Full URL mode when you have a complete URL and want to encode only the unsafe characters while keeping the URL structure intact.

Why does decoding sometimes fail?

Decoding fails when the input contains a malformed percent-encoded sequence, such as a lone '%' or an incomplete sequence like '%2'. The tester catches this error and displays a warning.

Does this handle Unicode characters?

Yes. JavaScript's encodeURIComponent correctly handles Unicode by first converting to UTF-8 and then percent-encoding each byte.