Use a browser that supports Web Serial (Google Chrome 89+ is recommended).
On your device, press the Export menu option to send data to this webpage.
After importing data, press Save Changes on this webpage to send the updated credentials to the device.
Only 16 characters will be stored per field. For email addresses (e.g. user@site.com), typing the @ character is enough for the device to automatically populate the site field.
All operations are performed locally. If you wish to run this application offline, simply download the file from GitHub.