XnConvert is a powerful and free cross-platform batch image processor, allowing you to combine over 80 actions. Compatible with 500 formats. 

Combine and choose between more than 80 different operations including:

• Metadata Editing.
• Transforms: Rotate, Crop, Resize,...
• Adjustments: Brightness, Contrast, Saturation,...
• Filters: Blur, Emboss, Sharpen,...
• Effects: Masking, Watermark, Vignetting,...