URL Encoder & Decoder
Percent-encode a URL or query string, or decode it back. It safely handles Korean, spaces, and special characters, and all processing happens in your browser, so the values you enter are never sent out.
How to use
Encode converts Korean, spaces, and special characters into %XX percent-encoding. Decode turns a percent-encoded string back to its original form.
This tool uses the encodeURIComponent method, widely used for query values.
Frequently asked questions
When do I need URL encoding?
It's needed when a URL's query string contains special characters such as Korean text, spaces, or &. Encoding keeps the address from breaking and lets it transfer safely.
Are the values I enter sent to a server?
No. All processing happens inside your browser, and the values you enter are not sent to any external server.
Practical example and verification criteria
URL Encoder & Decoder: First identify whether the source is plain text, a URL component, JSON, CSV, CSS, JavaScript, a color, or a token, then check character encoding, delimiters, quoting, and line-ending rules. Encoding is not encryption, decoding is not signature verification, and minification is not code optimization; define the required output format and destination before running the tool.
URL Encoder & Decoder: For a quick check, start with a b?c ↔ a%20b%3Fc as a small input whose result relationship you can verify directly. Confirm that the input summary, units, and options match your intent before applying the tool to real values or a copy of the source; this reduces setup mistakes.
URL Encoder & Decoder: Put the output into the target browser, build tool, API, or design surface and check for parsing errors or changed meaning. Decoding does not prove authenticity, a hash cannot be decrypted, and minified code is not guaranteed to behave like the source. Preserve the original and tests, and avoid entering passwords, tokens, or personal data.
URL Encoder & Decoder · Work record: For real work, record the input conditions, selected options, and result together. Do not assume the same state will remain after a refresh or device change. Preserve important results separately using copy, download, a screenshot, or another method the page supports, then reopen them in the target environment.
URL Encoder & Decoder · Error check: If an error or unexpected result appears, reduce the input, run again with default options, and then change one condition at a time. Recording error messages and boundary values helps distinguish format issues, unsupported cases, and browser resource limits, and prevents an empty result from being mistaken for success.
URL Encoder & Decoder · Scope of use: Check the page guidance for browser processing versus server lookup, storage location, and supported scope. Use sensitive source material or secrets only when strictly necessary. High-impact work such as legal, financial, or medical decisions or changes to an operational system requires current authoritative information and a separate verification process.