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smartdevbox
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URL Decoder — Decode Percent-Encoded URLs Online

URL Decoder converts percent-encoded strings (e.g. %20, %26) back to their original characters. Paste a URL-encoded string and the decoded output appears immediately. SmartDevBox uses decodeURIComponent() for full component decoding.

Common Use Cases

  • Reading encoded query strings in browser developer tools
  • Decoding redirect_uri values in OAuth flows
  • Understanding encoded log entries from web servers
  • Debugging URL construction in API integrations

Frequently Asked Questions

How do I decode a URL-encoded string?

Paste the percent-encoded string (e.g. hello%20world) into SmartDevBox. The URL Decoder converts it back to the original text (hello world) automatically on paste.

Privacy & Security

This tool runs entirely in your browser using client-side JavaScript. No data is sent to a server — your input never leaves your machine. SmartDevBox has no account system, no usage tracking, and no paid tier. See the Privacy & Security page for full details.

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