URL Encoder
URL encode text instantly. Free online URL encoder for query strings, path segments, and form data. No signup.
What Is a URL Encoder?
URL encoding is a fundamental web development skill needed whenever user input or dynamic data is placed into URLs. Improperly encoded URLs cause broken links, security vulnerabilities (injection attacks), and data corruption. This encoder handles the full RFC 3986 specification, converting all reserved and unsafe characters to their percent-encoded equivalents while preserving safe characters.
Example
Text Input:
Hello World! Special chars: &foo=bar bazURL-Encoded Output:
Hello%20World%21%20Special%20chars%3A%20%26foo%3Dbar%20bazHow to Use This Converter
- Paste your Text data into the input panel.
- View the converted URL-Encoded output — it updates instantly.
- Click Copy to copy the result to your clipboard.
- Verify the output matches your expectations before using in production.
Related Converters
All conversions run entirely in your browser — no data is sent to any server. For the specification, see RFC 3986 — URI Generic Syntax.
Frequently Asked Questions
What is URL encoding?
URL encoding (percent-encoding) replaces unsafe characters with a % sign followed by their hexadecimal ASCII value. Spaces become %20, ampersands become %26, and equals signs become %3D. This ensures special characters don't break URL structure.
When should I URL encode?
Encode user input before placing it in query strings, form submissions, or URL path segments. Any character that has special meaning in URLs (&, =, ?, #, /, spaces) must be encoded to be treated as literal data rather than URL structure.
What is the difference between encodeURI and encodeURIComponent?
encodeURI() encodes a full URI but preserves structural characters (:, /, ?, #, &). encodeURIComponent() encodes everything including those characters — use it for individual parameter values, not full URLs.
Should spaces be + or %20?
In query strings (application/x-www-form-urlencoded), spaces are encoded as +. In path segments and other URI components (RFC 3986), spaces are %20. Both are valid in their respective contexts.
The tools and calculators provided on The Simple Toolbox are intended for educational and informational purposes only. They do not constitute financial, legal, tax, or professional advice. While we strive to keep calculations accurate, numbers are based on user inputs and standard assumptions that may not apply to your specific situation. Always consult with a certified professional (such as a CPA, financial advisor, or attorney) before making significant financial or business decisions.
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