When I paste a url containing some reserved characters to the address bar of IE, FF, Chrome, I see that it displays it as it is but as far as I understand in uses percent-en
Put the URL into an HTML page, ie,
<a href="www.example.com?param=text with reserved characters">click</a>
Load in each browser, right-click, copy URL, paste into a text app or the address bar.
You can also use:
<script>
alert(encodeURIComponent('the text you want to see encoded'));
</script>
Copy the URL from the browser’s address bar and paste it into a text document.