I have seen really lot of bad reviews that pdffiler is not free. They have comprehensive description on pricing of their services.
So, engines describe them wrong. I was very annoyed when discovered that and made bad review because was sure that they make money by misleading.
But when I made some research I changed my mind and can say that main problem is really in engines.
I read a lot of comments that pdfiller is not free. And it is true, actually. They have subscription plans and never said that they are free.
That's the problem of search engines which say that product is free and misleads people. So, at real it is not a problem of pdffiler.
Quite lot of options for working with documents. And it is completely safe. I don't trust negative stuff here and on other review websites because main complaint that "it is not free". Well, their website never said that it is free.
No need to make scans and send documents with local services. It is very slow and lot of bureaucracy, which makes me annoyed.
And price for their service is really good.
Trustworthy and honest business.