Cloud Signer by JKRB

Cloud Signer is a desktop Firefox extension for managing Polkadot signing accounts and reviewing website requests from a convenient sidebar. Your accounts stay encrypted on your device, and you decide which accounts each website can access.

• Create or import signing accounts and manage encrypted JSON backups.
• Review transaction details and message signing requests before approving or rejecting them.
• Choose which accounts to share with each website, and revoke website access in settings.
• Lock your wallet manually or choose an automatic lock duration.
• Use the same wallet interface in light or dark mode.

Private keys, recovery phrases and vault passwords are not shared with websites. Approved websites receive only the public accounts you authorise and the signatures you explicitly approve. Cloud Signer signs transactions; the requesting website submits them.

Cloud Signer supports desktop Firefox 140 and later. Click its toolbar icon to open the sidebar. No Cloud Signer service account or subscription is required. Keep independent backups: Cloud Signer cannot recover a forgotten vault password or lost keys.