URL Encode
Free URL Encoder Online
About URL Encode
URL Encode is a free, instant, browser-based tool that converts any text or string into a URL-safe format using percent-encoding (also called URL encoding or percent-encoding). Percent-encoding replaces characters that are not safe in URLs — such as spaces, special characters, Unicode characters, and reserved characters — with a % followed by the character's two-digit hexadecimal ASCII value.
URL encoding is a fundamental requirement for correctly constructing URLs, query strings, form data, and API endpoints. Without proper URL encoding, special characters in URL components can break URL parsers, cause data corruption, trigger security vulnerabilities, and produce incorrect behavior in web applications. For example, the & character in a query string value would be interpreted as a parameter separator rather than a literal value; the # character would be interpreted as the start of a URL fragment; the = character would be interpreted as the separator between parameter name and value.
The URL encoding standard is defined in RFC 3986, which specifies that only unreserved characters (letters A-Z, digits 0-9, hyphen -, underscore _, period ., and tilde ~) may appear unencoded in URIs. All other characters must be percent-encoded when appearing in query strings, path segments, or other URI components. The encodeURIComponent() function in JavaScript, urllib.parse.quote() in Python, and URLEncoder.encode() in Java all follow this same standard.
URL encoding is a fundamental requirement for correctly constructing URLs, query strings, form data, and API endpoints. Without proper URL encoding, special characters in URL components can break URL parsers, cause data corruption, trigger security vulnerabilities, and produce incorrect behavior in web applications. For example, the & character in a query string value would be interpreted as a parameter separator rather than a literal value; the # character would be interpreted as the start of a URL fragment; the = character would be interpreted as the separator between parameter name and value.
The URL encoding standard is defined in RFC 3986, which specifies that only unreserved characters (letters A-Z, digits 0-9, hyphen -, underscore _, period ., and tilde ~) may appear unencoded in URIs. All other characters must be percent-encoded when appearing in query strings, path segments, or other URI components. The encodeURIComponent() function in JavaScript, urllib.parse.quote() in Python, and URLEncoder.encode() in Java all follow this same standard.
starKey Features
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RFC 3986 Compliant Percent-encoding
Encodes strings according to RFC 3986, the current standard for Uniform Resource Identifier syntax. Compatible with all modern browsers, HTTP clients, and web frameworks.
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Full Unicode Character Support
Correctly encodes international characters, Chinese, Arabic, Japanese, emoji, and all other non-ASCII characters by first converting to UTF-8 bytes before percent-encoding each byte.
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Real-time Encoding as You Type
Encodes your input in real time as you type or paste characters, showing immediately how each character will be represented in a URL-safe format.
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Client-side and Private
All encoding happens entirely in your browser without sending any data to a server. Safe for encoding sensitive query parameters, user data, or internal system identifiers.
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One-click Copy
Copy the URL-encoded output with a single click and paste it directly into your URL, API request, curl command, or configuration file immediately.
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Encode and Decode Together
Pair this tool with the URL Decode tool to verify that your encoded strings round-trip correctly back to the original input without data loss.
help_outlineHow to Use
1
Enter Your Text
Type or paste the text or string you want to URL encode into the input area. This could be a search term, a file path, an email address, or any text with special characters.
2
Click Process
Press the Process button or Ctrl+Enter. The tool immediately converts your string to its percent-encoded URL-safe representation.
3
Check the Output
Review the encoded string to confirm all special characters have been converted to their %XX equivalents. Spaces become %20, @ becomes %40, and so on.
4
Copy and Use
Click Copy to copy the URL-encoded string and paste it into your URL, API request builder, curl command, or application source code.
lightbulbUse Cases
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Query String Parameter Encoding
Encode user-submitted search terms, filter values, and other input before appending as URL query parameters, preventing broken URLs and injection vulnerabilities.
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API Endpoint Construction
Encode path segments and query parameter values when constructing API request URLs to ensure that special characters like &, =, ?, /, and # do not corrupt the URL structure.
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HTML Form Data Encoding
Understand how browsers encode HTML form data in application/x-www-form-urlencoded format for POST submissions and replicate this encoding programmatically.
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Deep Link and Shareable URL Building
Build shareable deep links that embed user content, route state, or navigation parameters by correctly encoding all special characters in the URL.