Whenever you put text with spaces or special characters into a URL or query string, encoding keeps the link valid.
Yes. URL Encode/Decode is completely free with no sign-up, no watermarks and no usage limits.
No. URL Encode/Decode runs entirely in your browser, so your data never leaves your device.
Only your device's available memory — there are no server-side limits because nothing is uploaded.
Percent-encode text for safe use in URLs, or decode it back.