Thumbsup by devon social advice

Mac users interested in Thumbsup by devon generally download:

ThumbsUp 4.5 Free

ThumbsUp is a helpful tool that enables Mac users to transform their favorite pictures into thumbnails suitable for being uploaded onto their webpages. The application lets you choose from various output formats, supports batch processing, and offers the results you need in minimum time.

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— Can we change the DPI output of the thumb for higher resolution?

DPI changing is not available if you use ThumbsUP. The quality is proportional with the size of the thumbnail. The bigger the thumbnail in size the lower the quality will be.