EMBED <iframe src="https://archive.org/embed/metropolis-background-sheets_20250121" width="560" height="384" frameborder="0" webkitallowfullscreen="true ...

The PDF format is meant to be non-editable, but if you scan a document that comes out too light or receive a contract with type that is too faint to read, you need a way to darken a PDF. Here are ...