Doodle Aquarium

Draw custom fish and watch them swim around every webpage you visit.

Doodle Aquarium is a playful browser extension that lets you build your own custom aquarium right on top of the web pages you visit. Use the built-in drawing tools to sketch fish, choose colors, adjust brush settings, and fine-tune their motion. Save each fish to your personal gallery and manage which ones are active in the tank. Once they’re in the aquarium, your fish swim around the page, bounce off the edges, and react to your mouse position in real time. You can create multiple fish with different sizes, speeds, and behaviors, then hide, edit, delete, or export them whenever you want. Everything is stored locally in your browser, so your aquarium feels personal and persistent without needing an account. Whether you want a calm background scene or a whimsical set of reactive swimming creatures, Doodle Aquarium adds a little personality to every webpage.