Having consistent images is so important. Consistency in colour, presentation, content.. all of it. There is a great free app you can use to process your images for instagram, pinterest, blogging, you name it. Go to the app store for your device and download VSCO.
Set yourself up with a login, and get started on your device. Now go and login on the VSCO site.
You can upload images from you desktop if you click the circular arrows in the top right corner. These images then sync to your device for processing.
There are so many processing options! Some are paid, but the cost is very low. You then save to your device's gallery/photos folder to publish to instagram or upload to your website. Easy Peasy.