URL Encoder & Decoder Online Free
Convert URLs, query parameters, and web strings into RFC 3986 percent-encoded format and decode obscure `%20` encoded parameters back into human-readable text. Features an automatic query string parameter inspector table.
URL Encoder & Decoder In-Browser Workspace
Input data or select files to begin. 100% private, client-side execution with zero server transmission.
How to Use URL Encoder & Decoder
- Step 1: Choose whether you want to 'Encode' or 'Decode' your web address or parameter string.
- Step 2: Select your encoding scope: `encodeURIComponent` (encodes all delimiters for parameter values) or `encodeURI` (preserves `https://` protocol and path slashes).
- Step 3: Optionally check 'Encode Space as +' if formatting for `application/x-www-form-urlencoded` form submissions.
- Step 4: Paste your URL into the left editor to observe immediate conversion.
- Step 5: Inspect the extracted query parameters table and click 'Copy Result' to export.
About URL Encoder & Decoder
Uniform Resource Identifiers (URIs) only permit a limited subset of standard US-ASCII characters. Characters outside this unreserved set—including spaces, ampersands (`&`), question marks (`?`), forward slashes (`/`), and non-Latin international glyphs—must be translated into percent-encoded triplets (a `%` symbol followed by two hexadecimal digits representing the character's UTF-8 byte). For instance, a space becomes `%20`, an ampersand becomes `%26`, and an exclamation mark becomes `%21`. Failing to encode parameters causes web servers to misinterpret query boundaries, leading to broken 400 Bad Request or 404 Not Found routing errors. Our URL Encoder and Decoder operates 100% in client-side JavaScript memory, preventing sensitive query tokens from leaking across public network proxies.
Frequently Asked Questions
What is the difference between encodeURI and encodeURIComponent?
`encodeURI` is intended for complete URLs and does not encode structural characters like `http://`, `/`, `?`, and `&`. `encodeURIComponent` encodes all special characters and is designed for individual parameter values.
When should I encode spaces as '+' instead of '%20'?
Spaces should be encoded as `+` when submitting HTML forms using `application/x-www-form-urlencoded` MIME types. For standard URI query parameters, `%20` is preferred.
Does this tool support international non-English characters?
Yes. All characters are encoded according to UTF-8 standards, supporting Chinese, Arabic, Cyrillic, Japanese, and emoji symbols.
Are my URLs logged or tracked?
No. All encoding and decoding execute strictly in your local browser sandbox. No URLs or search strings are ever recorded on our servers.