URL Encoder / Decoder

URL encoding (percent-encoding) replaces unsafe characters with a % followed by two hex digits. For example, a space becomes %20. This ensures special characters like &, =, ?, and # are transmitted correctly in URLs without being misinterpreted as delimiters.

encodeURI encodes a full URL but preserves characters that have special meaning in URLs (: / ? # @ & = +). encodeURIComponent encodes everything except letters, digits, and - _ . ~ making it safe for encoding individual query parameter values. Use encodeURIComponent for values, encodeURI for full URLs.

No. Everything runs 100% in your browser using built-in JavaScript functions. Your URLs and data never leave your device. No server, no logging, no tracking.

URLs use certain characters as delimiters: ? separates the path from query, & separates parameters, = separates keys from values, # marks the fragment. If your data contains these characters, they must be encoded so browsers and servers interpret them as data rather than structure.

Base64 URL encoding is a variant of Base64 that replaces + with -, / with _, and removes padding =. This makes it safe to use in URLs and filenames. It is commonly used in JWTs, OAuth tokens, and data URIs.