URL Encoding & Decoding Converter – Free Online Tool

Instantly convert any string into URL-encoded or decoded format.
Supports UTF-8, EUC-KR, and URI encoding, making it useful for web development and data processing.

It works for addresses (URLs), parameters, and query strings, all without installation—just open it in your browser.

Vivoldi’s URL converter delivers fast, reliable performance, making it a trusted free solution for both developers and marketers.

Encoding results:

Decoding results:

Have questions?
Check the FAQ.

URL encoding (percent-encoding) is the standard method of converting Unicode, spaces, and special characters in a web address (URL) into % symbols with numeric codes.
For example, a space becomes %20, and symbols like “?” or “&” are replaced with their unique codes.

This ensures that browsers and servers interpret characters consistently, making it essential to prevent broken links or data loss.

URL encoding is most commonly used in the following cases:

  • When generating URLs with query string parameters
  • When sending HTML form data using application/x-www-form-urlencoded
  • When sharing external links with international characters or emojis

Therefore, URL encoding is not just character conversion—it is a core technology for web development, SEO, and security.

If a URL-encoded string is encoded again, the % symbol becomes %25, resulting in a double-encoded state.
For example, the Korean character 가 → %EA%B0%80 → encoded again becomes %25EA%25B0%2580.

When double encoding occurs, browsers or servers may misinterpret the data, leading to broken links, corrupted parameters, or failed API calls.
Therefore, URL encoding should be applied only once when needed, and strings already encoded multiple times must be decoded repeatedly to restore the original.

In particular, API integrations, query string transfers, and external service calls are prone to such issues, so always check the encoding status to avoid errors.

Yes. Vivoldi’s URL encoding/decoding tool automatically and accurately converts not only Korean, Japanese, Chinese, and other multilingual characters, but also special symbols like spaces ( ), %, &, #, and =.

Complex website addresses, query parameters, and external links can be handled easily with copy → paste → instant conversion, and results are displayed in real time.

This feature is especially useful for web development, data transmission, email link creation, and global service operations, helping prevent encoding errors and ensuring efficient workflows.