Why percent-encode a URL?

Certain characters such as spaces and '&' have special meaning in URLs. Percent-encoding makes them safe to transmit without breaking the URL structure.

What is the difference between component and full URL modes?

Component mode encodes every reserved character (like encodeURIComponent), while full URL mode preserves URL structure such as '://', '?', '#', and '&', encoding only spaces and truly unsafe characters.

How are spaces encoded?

Spaces are encoded as %20 (not '+'). The + encoding is specific to application/x-www-form-urlencoded in HTML forms; %20 is the correct general-purpose encoding for URL paths and query parameters.

Which characters are left unencoded?

Unreserved characters A-Z, a-z, 0-9, '-', '.', '_', and '~' are never encoded. In full URL mode, reserved characters like ':', '/', '?', '&', '=' are also preserved.

How are multibyte characters handled?

Characters are encoded to bytes using the selected charset (UTF-8 by default), then each byte is percent-encoded. '你好' becomes %E4%BD%A0%E5%A5%BD in UTF-8.

Is my data uploaded anywhere?

No. All encoding happens locally in your browser with no server round-trip.

Codificador de URL

Percent-encode text for safe use in URLs. Gratis, privado y 100% del lado del cliente.

ModoConjunto de caracteres

Entrada

Probar un ejemplo:

Salida

Local only

Historial reciente

Sin historial aún

Uso

Paste the text or URL into the input box.
Choose component or full URL mode.
Copy the percent-encoded result.

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Construct properly encoded consulta cadenas de JavaScript objetos. Handle arreglos, nested objetos, y special caracteres correctly.

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Codificar binary data into a JSON-safe string

Convertir raw bytes (images, encrypted blobs, file contents) into a Base64 string that can be embedded inside a JSON field without breaking the structure.

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Codificar text for safe use inside a URL query string

Turn arbitrary texto (con spaces, ampersands, Unicode, equals signs) en un valor ese puede ser placed directly después ?key= en un URL sin breaking parsing.

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Analizar a URL into components and construct URLs from parts

Decompose un URL en protocol, host, path, consulta, fragment — y construir un URL de individual componentes safely.

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Analizar URL query strings

Consulta cadenas pasar clave-valor pairs en URLs después el ?. Aprender parsing, codificación, y handling de arreglos, nested objetos, y special caracteres.

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Usar MQTT topic estructura para IoT messaging

MQTT topics usar slash-separated hierarchies con wildcards para subscription. Aprender topic design, QoS levels, y retained messages.

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Pipelines que usan esta herramienta

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Kebab Case y codificación URL

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Preguntas frecuentes

Why percent-encode a URL?: Certain characters such as spaces and '&' have special meaning in URLs. Percent-encoding makes them safe to transmit without breaking the URL structure.
What is the difference between component and full URL modes?: Component mode encodes every reserved character (like encodeURIComponent), while full URL mode preserves URL structure such as '://', '?', '#', and '&', encoding only spaces and truly unsafe characters.
How are spaces encoded?: Spaces are encoded as %20 (not '+'). The + encoding is specific to application/x-www-form-urlencoded in HTML forms; %20 is the correct general-purpose encoding for URL paths and query parameters.
Which characters are left unencoded?: Unreserved characters A-Z, a-z, 0-9, '-', '.', '_', and '~' are never encoded. In full URL mode, reserved characters like ':', '/', '?', '&', '=' are also preserved.
How are multibyte characters handled?: Characters are encoded to bytes using the selected charset (UTF-8 by default), then each byte is percent-encoded. '你好' becomes %E4%BD%A0%E5%A5%BD in UTF-8.
¿Se suben mis datos a algún lugar?: No. Toda la codificación se realiza localmente en su navegador sin round-trip al servidor.