There is no single solution and PDF is a very unhelpful choice for editing. You need ro be exact and specific. Slow people to upload files made with particular software WHICH YOU OWN. Edit in the original software. You may need the exact version.
When the editing is FINISHED make a PDF, not before.
Sorry slow -> allow.
Thanks for your reply. are there any vendors for this kind of software?
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There isn't any "kind of Software". only the right software. If someone sends you a Word document you need Word. If someone sends you an Illustrator document you need Illustrator. on the other hand if someone sends you an image file (eg JPEG PNG BMP) you can use Photoshop for them.
i suggest you consider exactly what kinds of file you want to handle and describe the kind of editing you want.