#remove html file extension-e.g. https://example.com/file.html will become https://example.com/file RewriteEngine on RewriteCond %{REQUEST_FILENAME} !-d RewriteCond %{REQUEST_FILENAME}\.html -f RewriteRule ^(.*)$ $1.html [NC,L]
#remove php file extension-e.g. https://example.com/file.php will become https://example.com/file RewriteEngine on RewriteCond %{REQUEST_FILENAME} !-d RewriteCond %{REQUEST_FILENAME}\.php -f RewriteRule ^(.*)$ $1.php [NC,L]