ReaTIFF is a popular image converter, allowing you to convert images from most commonly used graphic formats to TIFF. You can convert you images to TIFF either one by one or all at once as a batch job. Built-in image editor provides all popular image processing functions, including resize, crop, rotate, mirror, brightness, contrast, border, watermark, red eye correction and a dozen of various artistic effects. Batch job automation features include Windows® Explorer right-click menu integration and command-line usage capabilities.
Key Features:

Simple TIFF conversion 35+ image formats support		Batch conversion with processing Command line interface
full features list

System Requirements:

Windows® XP, 2003 server, Vista, 2008 server, Windows 7, 8 ( full 32-bit & 64-bit editions support )

Knowledge base related issues: ReaSoft all-round image processing solution:

ReaConverter - high quality batch image converter with 400+ supported formats.