WebPDF

WebPDF is an online service that provides an easy an accessible way to alter PDF files. You can do any of the following operations using the web interface, but there's also a developer friendly API that you can integrate into your own application:

Merge multiple PDFs Split PDF Compress PDF Extract PDF metadata Flatten PDF forms Extract images from PDF Extract text from PDF Lock & Unlock PDF OCR PDF Change PDF size Change PDF version Watermark PDF Optimize PDF for web Etc...