URL Encoder / Decoder
Switch between Encode and Decode mode to convert text to percent-encoded format or back to readable strings. This tool uses JavaScript's encodeURIComponent/decodeURIComponent functions, making it safe for query parameters, form data, and API payloads. Nothing is sent to a server.
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[1 suggestions]About the URL Encoder / Decoder
URL encoding (also called percent-encoding) replaces characters that have special meaning in URLs — such as spaces, ampersands (&), question marks (?), hash symbols (#), and forward slashes (/) — with a percent sign followed by their two-digit hexadecimal byte value. For example, a space becomes %20 and an ampersand becomes %26. This tool uses JavaScript's encodeURIComponent(), which encodes all reserved URI characters, making it safe for individual query parameter values, form field submissions, and API request bodies. The companion decodeURIComponent() reverses the process, converting percent-encoded sequences back to readable UTF-8 characters. Developers commonly need this when debugging API integrations, constructing redirect URLs with dynamic parameters, or inspecting encoded cookie values. Unlike encodeURI() (which leaves structural characters like / and ? intact for encoding full URLs), encodeURIComponent() is the correct choice when your input is a single value that may contain any of these reserved characters.
Why do URLs need encoding?▾
Characters like spaces, &, ?, #, and / have special syntactic meanings in URLs. Percent-encoding (e.g., space becomes %20) ensures user data is not mistaken for URL delimiters.
What is the difference between encodeURI and encodeURIComponent?▾
This tool uses encodeURIComponent, which encodes all special characters including /, ?, and #. Use this when encoding individual query parameter values, not entire URLs.
Can I decode complex nested query strings?▾
Yes — the decoder handles nested percent-encoded characters and UTF-8 sequences. Paste any encoded string and get the readable version instantly.