How do you URL encode a string?
To URL encode text, paste it and the percent-encoded version appears instantly. Spaces become %20, ampersands %26, slashes %2F, and question marks %3F, so 'hello world&lang=en' becomes hello%20world%26lang%3Den. Encoding follows the JavaScript encodeURIComponent standard, which leaves letters, digits, and - _ . ! ~ * ' ( ) unchanged, and runs entirely in the browser.
What is the difference between %20 and + for spaces?
Both represent a space, but in different contexts. %20 is the standard percent-encoding valid anywhere in a URL. The plus sign is only a space inside application/x-www-form-urlencoded data, such as HTML form submissions and query strings built by browsers. encodeURIComponent always outputs %20, which is safe in both places.
Runs in your browser. Your files and text never leave your device - nothing is uploaded.