PDF Blender
Merge PDF files
PDF Blender is an open source web app powered by iText for merging / combining pdf documents and files online – on the fly.
PDF Blender respects your privacy.
Uploaded PDF documents are not stored or saved on the server.
Files are immediately disposed from memory when a merge is complete.
PDF Blender currently supports setting output filename, document language and preserving tags in PDF/UA documents (accessibility enabled PDF files).
Full source code hosted on GitHub.