Not exactly offline, but if you have a spare clean android device with internet access and a camera, you could use the app/website I created, https://throwpass.

Not exactly offline, but if you have a spare clean android device with internet access and a camera, you could use the app/website I created, https://throwpass.com https://throwpass.com . It allows you to send your password from your android device to any computer with a browser. It encrypts the password end to end with a public key generated in the browser and distributed to the device via qr code.