Simply visit your Zotero account profile and select a storage plan.

All payment and billing information is handled by Google Checkout. Zotero and the Corporation for Digital Scholarship never see your credit card number, only confirmation that your payment has been processed.

If Google Wallet does not support your billing address, we can invoice you via PayPal. Please check https://checkout.google.com/buyerSignup for a current list of supported countries. If you find that your country is not yet supported, then please send an email to storage@digitalscholar.org including your Zotero username and the quantity of storage you would like to purchase (2, 6, 10, or 25 GB).

Yes, any groups that you own will draw from your storage subscription. Any members of those groups may freely access any stored files.

Your personal library and any groups you own automatically draw their storage from your subscription. Groups not owned by you draw their storage from the group owner's subscription.

If you choose to upgrade your storage subscription, the prorated balance on your existing account will be used to extend the term of your new subscription. Example: You have 6 months left on a $20 2 GB subscription and decide to upgrade. (6 months ÷ 12 months) x $20 = $10 remaining value. If you upgrade to the $60 6 GB plan, we apply that $10 to your purchase to extend your new subscription term. ($70 ÷ $60) * 12 months = 14 months.

If you opted to renew your subscription automatically, you can cancel your next renewal by visiting your storage settings. As stated in the terms of service, paid accounts are non-refundable. We implement this policy because costs incurred on our end fluctuate dramatically according to individual usage patterns.