Legitimate downloaders do not ask for credentials. If a site asks you to log in via their portal, close it immediately. That is a phishing scam.
Open a new tab and navigate to your chosen "Patreon Image Downloader Online" tool. Patreon Image Downloader Online
If you are bulk downloading hundreds of images from a creator's page, Patreon might temporarily rate-limit your IP address (to prevent bots). A VPN allows you to cycle IPs, though for standard personal use (50-100 images), you likely won't need this. Legitimate downloaders do not ask for credentials