Almost all bloggers use Photo Editing tools like Photoshop and GIMP. The main reason it the we cannot afford to hire an expert whenever we want to modify a photo, like adding text to it or changing its size etc, specially when all this is so simple. But it may happen that we do not have access to these tools,due to some unavoidable circumstances. In these cases, these free online, yet powerful tools come to the rescue.
These sites are also very useful when you do not want to use those heavy applications for small applications. All of them offer basic photo-editing functions for free although there may be a premium (or rather ‘pro’) version for advanced features and tools.