Disable Form Autocomplete

You can add the attribute → autocomplete="off" to your <form> tag.

Some browsers will ignore this though. A complete breakdown of this attribute can be seen here.

Quick example in code: 

<form method="post" autocomplete="off">
<input type="email" id="email" name="email">
<input type="password" id="password" name="password">
<input type="submit">
</form>