How do the online file converting tools work which simultaniously create backlinks?

Hi there,

I have read some posts here about websites which offer a free service, like converting a pdf to a doc.

In these posts it is mentioned that the files are used as a backlink after conversion.

I was wondering how this work, so I can check of I can build a similar useful tool for my niche too.

submitted by /u/EntrepeNetherlands
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