Crypto

URL Encoder / Decoder

Encode and decode URLs with percent-encoding. Component mode for query params. 100% client-side.

Component mode: encodes / ? & = for query strings. Full URL mode: preserves :// and path structure. 100% client-side.

How to use

  1. Enter a domain, URL, or value relevant to URL Encoder / Decoder.
  2. Run the check and review the output carefully.
  3. Apply recommended fixes, then run the check again to verify.

Common use cases

  • Pre-deployment validation for URL Encoder / Decoder.
  • Incident triage when security checks fail in production.
  • Periodic security review as part of technical SEO and hardening.

Example inputs

https://example.com?q=hello worldencodeURIComponent for query params

Common issues and fixes

Double encoding

Encoding already-encoded strings corrupts data. Decode once before re-encoding.

Wrong encoding mode

encodeURI preserves :/@. Use encodeURIComponent for query params and path segments.

Invalid UTF-8 in URL

Percent-encoding must represent valid UTF-8. Fix source encoding first.

Recommended remediation

Use encodeURI for full URLs. Use encodeURIComponent for query values and path parts. Decode before comparing.

FAQ

Is URL Encoder / Decoder free to use?

Yes. This tool is free and can be used without account registration.

Do you store submitted values?

Only the minimum processing needed for the check. For client-side tools, data stays in your browser.

How should I use these results?

Use the output as a diagnostic baseline, apply fixes in your stack, then re-run the check to confirm remediation.

Related security tools

Base64 Encoder / Decoder

Encode and decode text to and from Base64 format. Fully client-side — your data never leaves the browser.

Hex Encoder / Decoder

Convert text to hex and hex to text. UTF-8. 100% client-side.

URL Parser

Parse URL into protocol, host, path, query params. 100% client-side.