URL encoding (also called percent-encoding) replaces unsafe characters in URLs with a percent sign followed by their hex code. This ensures URLs transmit correctly across the internet. For example, a space becomes %20 and an ampersand becomes %26.
encodeURI() to encode a full URL while preserving the structure (://?#&= are kept).encodeURIComponent() to encode a value for use inside a query parameter (encodes everything including &, =, ?).Encode or decode URLs and query strings in three steps.
Enter a URL, query parameter value, or any string that needs percent-encoding. The tool handles Unicode and special characters.
Select encodeURIComponent for query parameter values or encodeURI to encode a full URL while preserving its structure. Click Encode or Decode.
Copy the encoded or decoded result, or use Swap to reverse the operation and verify round-trip accuracy.
Safely encode values before appending them to URLs. Characters like &, =, and spaces must be percent-encoded to avoid breaking the query string structure.
Marketing and analytics platforms wrap URLs in layers of encoding. Paste a percent-encoded redirect URL here to decode it and reveal the actual destination.
OAuth flows require the redirect_uri parameter to be properly encoded. Paste your callback URL, encode it with encodeURIComponent, and drop it into the authorization request.
Paste your text into the input field and click Encode to convert it to a URL-safe format, or click Decode to convert a percent-encoded string back to readable text. Results appear instantly with no server calls.
URL encoding (also called percent-encoding) replaces unsafe or reserved characters in a URL with a percent sign followed by two hex digits (e.g., space becomes %20). This ensures URLs are valid and can be transmitted correctly by browsers, servers, and APIs.
Yes. All encoding and decoding runs entirely in your browser. No data is transmitted to any server, so it's safe to encode API keys, query parameters with sensitive values, and authentication tokens.
encodeURI encodes a full URI but preserves characters that have special meaning in URLs (like /, ?, #, &). encodeURIComponent encodes everything except letters, digits, and a few safe characters — use it for encoding individual query parameter values. This tool uses encodeURIComponent for maximum safety.
Characters that must be encoded include spaces, &, =, ?, #, /, +, and non-ASCII characters like accented letters and emoji. Reserved characters have special meaning in URLs and must be encoded when used as data rather than delimiters.
Yes, it's completely free with no sign-up or usage limits. All processing runs locally in your browser.