Picasa has an "Email Upload" feature which allows you to upload photos to Picasa web using a secret email address which is created by Picasa. First you need to enable this feature on your Picasa Web Albums. To enable, click 'Gear icon' located at the top right corner of the window and select 'Settings' option and then click 'General' tab. In the 'Upload photos by email' section, select the "Allow me to upload photos by email". Enter a 'secret word. The secret word must be 6-15 letters/digits long. As soon as you enter this word, you will get an email address. Click 'Save changes' button. Now download and install 'Instagram' app on your mobile. If you are using iPhone, enable the 'Save Original Photos' option located in the Instagram's account settings. If you are a Android user, then Instagram automatically saves your photos to 'Camera shots' album in your phone photo gallery. Select the Instagram photos which you want to upload to Picasa. To email upload your photos, just attach them to an email and send it to the email address provided by Picasa. This is how you can get Instagram photos into Picasa.