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 a ...
Free programs and Web services let you create, edit, and convert PDFs, although they lack Acrobat's bells and whistles. Dennis O'Reilly began writing about workplace technology as an editor for ...
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