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Encode or decode strings to ensure safe transmission within query parameters.
Working on API integrations, UTM tracking links, or web database queries? Special characters in URLs can break routing paths. Our Free online URL Encoder / Decoder helps you convert strings to percent-encoded formats or decode escaped strings instantly.
Web browsers and server directories use URIs to fetch files and route web pages. To prevent parsing conflicts, the internet standard defines a strict character set. If you need to send data—like an email address containing an @ symbol, or a nested URL containing slashes—inside a query parameter, you must escape them. The URL Encoder / Decoder converts these characters into safe hexadecimal byte values. If you are building tracking links, run your variables through our UTM Campaign Builder before encoding. If you want to package links into scannable graphics, try our QR Code Generator.
When developing web scripts, selecting the correct encoding scope is crucial:
http://, slashes, and colons). Use this when repairing broken links containing spaces.%20 into %2520, which can break server routing controllers. Always decode your strings first if you are unsure of their status.%2F for slashes). Use our tool to automate conversions and prevent syntax errors.To learn more about URI guidelines, consult the official IETF RFC 3986 URI Specification and explore JavaScript developer references at the MDN Web Docs encodeURIComponent Page.
URL encoding (also known as Percent-Encoding) is a mechanism used to translate special characters within a Uniform Resource Identifier (URI) under specific conditions. Internet routers and web browsers are designed to interpret a specific set of characters (like `/`, `?`, `&`, `=`, `#`) as syntax controls. If your target data contains these characters (for example, putting an email address or another URL inside a query parameter), you must encode them to prevent parsing errors.
Percent-encoding replaces non-ASCII or reserved characters with a percent sign (`%`) followed by a two-digit hexadecimal representation of the character's ASCII byte value. For example, a space character is replaced by `%20`, a question mark becomes `%3F`, an ampersand becomes `%26`, and an equals sign becomes `%3D`.
Under URI guidelines (RFC 3986), characters are split into two groups: Unreserved characters (letters `A-Z`, `a-z`, numbers `0-9`, and symbols `-`, `_`, `.`, `~`) do not have special syntactic meaning and never need encoding. Reserved characters (such as `/`, `?`, `:`, `@`, `&`, `=`, `+`, `$`) have syntactic purposes. If they are used as part of the data query, they must be escaped.
No. URL encoding actually increases the character length of your text blocks. Since a single space (1 character) translates into `%20` (3 characters), your query string grows longer. Keep this in mind when developing API layouts with tight URL length limits (typically 2048 characters in older web browsers).
In JavaScript, `encodeURI` is designed to encode a full website address, leaving address controls (like `http://`, slashes, and port colons) intact. `encodeURIComponent` is designed to encode a single query key or value parameter, escaping all reserved characters (including slashes and colons) to ensure they do not break the parent URL structure.
Yes, but you will need to run the decoding process twice. If a string is encoded twice, symbols like `%` become `%25`. Running the decoder once will return a percent-escaped string (e.g. `%20`), and running it a second time will restore the original standard text.
No. Our URL Encoder / Decoder runs 100% locally in your web browser. The conversions are processed using standard client-side JavaScript APIs (like `encodeURIComponent` and `decodeURIComponent`). Your confidential passwords, API keys, and email addresses are never sent over the internet, ensuring total data security.
Instant, browser-local utilities to streamline your digital workflows.