Occasionally I get a couple of PDFs that I need to unlock or want to merge. There are a series of websites that will help you with this. They all appear to be run by the same people:
- PDFUnlock! – Unlock secured PDF files online for free
- PDFSplit! – Split PDF files online for free
- PDFProtect! – Add password protection to PDF files online for free
- PDFRotate! – Rotate PDF documents online for free
- PDFMerge! – Merge PDF files online for free
The sites are kind of ugly and have lots of ads, but the features work just great.