Now you can post photos on Instagram from your computer
Thanks to Instagram’s new mobile website you can use your desktop browser to upload photos from your computer!
How to post photos on Instagram from your computer in 4 easy steps
Step 1: open your browser and go to Instagram.com
Step 2: open your browser’s developers tools
Step 3: toggle device toolbar and set the screen to a mobile device of your choice.
Step 4: press the upload button and upload your photo directly from your computer!!!
PS: the first time it might not work properly; just try again a second time and it should let you publish the photo.