Smallpdf - PDF document management and conversion suite
TinyPNG - Make your website faster and save bandwidth. TinyPNG optimizes your PNG images by 50-80% while preserving full transparency!
iLovePDF - Free online PDF tool set
ImageOptim - Faster web pages and apps.
Adobe Acrobat DC - Make your job easier with Adobe Acrobat DC, the trusted PDF creator. Use Acrobat to convert, edit and sign PDF files at your desk or on the go.
TinyJPG - Compress JPEG images with perfect quality and file size