Unwanted ftp surprises

Sometimes, when I upload files to ftp, and then download them, I face with some "unwanted tricks" inside gotten files.

Initial file:

<ul>
 <li><a href="#">Home</a></li>
 <li><a href="#">Works</a></li>
 <li><a href="#">About</a></li>
 <li><a href="#">Docs</a></li>
 <li><a href="#">Blog</a></li>
 <li><a href="#">Forums</a></li>
</ul>

2 examples:

1) Unwanted blank lines.

When I get files back, code becomes look like:

<ul>

 <li><a href="#">Home</a></li>

 <li><a href="#">Works</a></li>

 <li><a href="#">About</a></li>

 <li><a href="#">Docs</a></li>

 <li><a href="#">Blog</a></li>

 <li><a href="#">Forums&开发者_如何学Pythonlt;/a></li>

</ul>

2) Tabulation clearing:

Code transforms to:

<ul><li><a href="#">Home</a></li><li><a href="#">Works</a></li><li><a href="#">About</a></li><li><a href="#">Docs</a></li><li><a href="#">Blog</a></li><li><a href="#">Forums</a></li></ul>

Why it happens and how to to beat these surprises?

Make sure your transfer type is correct. In other words, ASCII or auto.