Online or Offline tool to align html script into same line and remove extra-spaces?

Is there any online or offline tool to align HTML scripts into same line and remove extra-spaces for example:

Before:

<head>
  <h1>This is my page.</h1>
  </head>
  <body>
    <h4>Text example.</h4>
  </body>

After:

<head><h1>This is my page.</h1></head><body><h4>Text example.</h4></body>

I want a tool because my scripts are too large to do this manually, if so it will take me some time to finish.

Solution