Can anyone explain this in detail?
They provide everything free for online users. But Offline software they askings some money.
Proof Check this image below: (Found this image on Online)
But why they provide all tools online for free
Read this post and if you still have questions then ask…
How to build tools like this
Marketing Strategy bro. Most of the people only want the offline editor because online take some times to upload & process. So, They set online free to get more customers.
PDFCandy developed using JQuery & JS
How can I get these kind of tools for my blog
Develop yourself or Hire developers