World's most comprehensive, powerful, process-based PDF editor
iLovePDF Rest Api - PHP Library
Flexxi can resize, compress, rotate, rename, convert images
PDF File Converter / Compression / Fusion
Auto Check big images and compress images in building
Batch Images Converter
Converts every printable document to PDF, JPG, PNG, TIF and more
scale down and compress jpg images
Jekyll plugin for compress/optimize images (jpg, png, gif, svg)