Thumbs Up is a free software for Mac OS X to create thumbnails of pictures and movies. It can also be used to batch-resize images.
Thumbs Up has a simple preferences window. To resize images, you can configure the various options in the preferences window, and then drag-drop the images to the Thumbs Up icon.
Resized images are created in the same folder as the original files. You can choose prefixes or suffixes to filenames, or let Thumbs Up create all the images to a folder (which will be within the folder that contains original files).
Resizing can be configured by percentage or maximum size. Formats supported include JPEG, TIFF, PNG, BMP and GIF. There are also options for antialiasing and sharpening. You can choose the level of compression to be applied while saving the image. ThumbsUp also supports PDF to image conversion, so you can use it to convert PDFs to other image formats.
Download Thumbs Up
I started using Thumbs Up to write tutorials on this site, which mostly requires resizing several images to fit the width of content column.
Windows users might like Al Image Converter, a free software for Windows, with similar features and functionality.
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