URL Encoder / Decoder

Developer

Percent-encode special characters for safe URL usage, or decode encoded URLs back to readable format.

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Works great for

🔗

Encoding query string parameters

Percent-encode spaces, ampersands, and special characters in query parameters before appending them to a URL. Essential when building API request URLs or constructing search query strings dynamically.

📲

Building deep links with special characters

Encode user names, product titles, and UTM campaign values that contain slashes, plus signs, or Unicode characters. Ensures deep links open correctly across mobile apps and web browsers.

↩️

Preparing and debugging redirect URLs

Encode full URLs that appear as the value of a redirect_uri or return_url parameter in OAuth flows and login redirects. Decode percent-encoded redirect targets to verify they point to the right destination.

📋

Encoding HTML form POST data

Validate that form field values are correctly percent-encoded before submitting multipart or application/x-www-form-urlencoded requests. Useful when manually crafting curl commands or Postman bodies.

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Debugging URL parsing issues

Decode a mangled or double-encoded URL to see its original components and identify where encoding went wrong. Helps diagnose 400 Bad Request errors caused by incorrectly escaped characters.

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Creating bookmarklets and data URIs

Encode JavaScript bookmarklet code or Base64 data URIs that need to be embedded in href attributes. Handles all reserved characters that would otherwise break the enclosing HTML tag.

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