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

Zotero Lab and Zotero Institution provide members of your organization with unlimited personal and group cloud storage.

All major credit cards are accepted for payment. Institutions can also pay via bank transfer.

If you don't have a credit card or you encounter problems after trying to pay via your storage settings page, then we can invoice you via PayPal. Please send an email to storage@zotero.org including your Zotero username and the quantity of storage you would like to purchase (2 GB, 6 GB, or unlimited).

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 calculate the expiration 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 new subscription level to set a new expiration. ($10 ÷ $60) * 12 months = 2 months.

When you purchase a storage subscription, you may choose to renew or not to renew automatically each year. You can cancel automatic renewal at any time from your storage settings. You'll also receive a reminder email when your subscription is expiring or about to renew automatically.

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.