Yes, completely free with no signup or usage limit.

Is my data uploaded to a server?

No. Encoding and decoding happen directly in your browser.

What does URL encoding do?

It converts characters that aren't safe in a URL (spaces, &, =, etc.) into percent-encoded sequences like %20.

Encode text for safe use in a URL, or decode a percent-encoded string back to plain text.

Plain text or URL

: Yes, completely free with no signup or usage limit.
: No. Encoding and decoding happen directly in your browser.
: It converts characters that aren't safe in a URL (spaces, &, =, etc.) into percent-encoded sequences like %20.