URL EncoderRFC 3986 Percent Encoding Made Simple

URL encoding (also called percent-encoding) converts special characters into a format that can be safely transmitted over the internet. URLs can only contain a limited set of ASCII characters — any character outside this set (spaces, non-ASCII letters, symbols like &, =, ?, #) must be encoded. For example, a space becomes %20, and "hello world" becomes "hello%20world". Our tool handles this automatically using the RFC 3986 standard, making your URLs safe for APIs, webhooks, query strings, and any HTTP request.

Our encoder uses the browser's built-in encodeURIComponent() function, which follows RFC 3986 — the official internet standard for URL encoding. Simply paste any URL into the input panel, and the tool encodes it in real-time using auto-encode. You can optionally expand the "URL Components Breakdown" to see how the protocol, host, path, query parameters, and fragment are each encoded individually. Everything runs locally in your browser — no server involved.

encodeURI() preserves characters that have special meaning in a URL (like :, /, ?, #, &) because it's designed for complete URLs. encodeURIComponent() encodes ALL special characters and is designed for URL components — like query parameter values, path segments, and fragment identifiers. Our tool uses encodeURIComponent() to give you the most thorough encoding, ensuring your URL works safely in any context including query strings, API requests, and HTML attributes.

RFC 3986 defines reserved characters that must be percent-encoded when used outside their special purpose. These include: & (ampersand), = (equals), + (plus), ? (question mark), # (hash), % (percent), / (forward slash), : (colon), ; (semicolon), @ (at sign), ! (exclamation), $ (dollar), and others. Our tool displays all reserved characters found in your encoded URL with exact counts, so you always know which special characters are present.

Yes. The URL Components Breakdown feature automatically parses your URL and shows every query parameter individually. Each parameter name and value is encoded separately using encodeURIComponent. This is especially useful for constructing API URLs, webhook endpoints, and form submissions where each parameter must be properly encoded to avoid breaking the URL structure.

Absolutely. 100%. All encoding happens entirely in your browser using client-side JavaScript. Your URLs — including any sensitive API endpoints, authentication tokens, or internal links — are never uploaded, transmitted, stored, or logged on any server. We have no way of seeing your data. The optional auto-save feature stores input in your browser's localStorage only. This makes the tool safe for enterprise and production use.

Yes, encodeURIComponent (which powers this tool) handles full Unicode natively. Characters from Arabic, Chinese, Hindi, Japanese, Korean, Russian, and any other script are correctly encoded to their multi-byte UTF-8 percent-encoded forms. Emoji are also supported. For example, the Chinese character "你" becomes "%E4%BD%A0", and the emoji "🎉" becomes "%F0%9F%8E%89". This ensures your URLs work correctly across all browsers and servers globally.

Yes. Once the page loads in your browser, you can disconnect from the internet and continue using all features — encode URLs, view component breakdowns, undo/redo, copy, download, share. Everything runs locally with zero network requests after the initial page load. This is ideal for working in secure environments, on planes, or anywhere with limited connectivity. Your encoding stays private and instant regardless of your connection status.