Assuming you are using WordPress 4.x, and want to remove the meta tag in each page like:
<meta name="generator" content="WordPress 4.1" />
you can add the following line into your theme’s functions.php file (not your core functions.php file)
remove_action('wp_head', 'wp_generator');
Before (in page source): 
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<style type="text/css">.recentcomments a{display:inline !important;padding:0 !important;margin:0 !important;}</style> <style type="text/css" id="custom-background-css"> body.custom-background { background-color: #ffffff; } </style> |
