Google shows how to turn paper sketches into interactive apps with Gemini Canvas

From paper to prototype

Google recently published a walkthrough demonstrating how a photograph of a paper sketch can be transformed into an interactive application. The process begins with a user taking a photo of a hand-drawn mock-up, such as a game board or a habit tracker. This image serves as the visual blueprint for the AI to follow.

Once the image is uploaded, the user selects the Canvas feature and asks Gemini to write the code. The AI analyzes the visual elements in the photo to determine the layout and functionality. This allows a user to move from a physical drawing to a digital draft in a single step.

As reported by Unite.AI, this workflow is designed to shorten the route to a first version of a project. While the sketch initiates the prototype, the subsequent work involves using the various tools provided within the Canvas environment to refine the result.

How the Canvas works

Canvas is an interactive space for documents and code that Google introduced in March 2025. It supports the generation and previewing of web app prototypes, specifically those built with HTML and React. It provides a dedicated environment where the code and the visual output live side-by-side.

The system provides several controls for managing the generated output. Users can view the raw code in a dedicated window for direct editing or use a show console to see errors and logs from the preview. There is also a recent-changes view that lets users inspect previous revisions of the code.

A specific feature called Select & ask allows for targeted updates. Instead of giving a broad instruction to the entire app, a user can highlight a specific section and describe the desired change. This allows for precise adjustments to colors, fonts, or specific features through a conversation with the AI.

Editing and testing features

After the initial code is generated, the app appears in a preview window for immediate testing. Users can interact with the tool to see how it behaves in real-time. If something is not working as expected, the user can request changes through the chat interface or by editing the code manually.

The platform includes specific features for mobile users, such as the ability to add a home-screen shortcut for a Canvas app on Android devices. However, some formatting and text style controls remain exclusive to the desktop web app. This ensures that the most complex editing tasks are handled in a full browser environment.

For users who need to handle more complex projects, Google offers specific tiers. Subscribers to Google AI Pro and Google AI Ultra have access to a 1-million-token context window. This larger capacity is intended to support more intricate projects that require the AI to remember more information at once.

Sharing and data access

The workflow extends beyond the individual creator through public sharing links. Users can share their Canvas apps via a link that allows others to view the project. This makes the link a primary method for both distribution and managing access to the work.

Sharing a link involves specific data implications for the recipient. Anyone with the public link can view and edit the data associated with the app. This means that the link acts as an access decision, granting the recipient the ability to interact with the app's data across different sessions.

Recipients who have the link can also copy the shared Canvas to continue editing it themselves. However, this specific functionality is restricted to users who are 18 years of age or older. Shared links currently open only on the web and do not support the Gemini mobile app.

Next steps for creators

While the sketch-to-app feature provides a fast start, the success of a project depends on the inspection tools. Users will need to spend time checking the generated behavior in the preview window and monitoring the console for any errors. These steps are essential for moving from a rough draft to a functional tool.

The availability of these features depends on the region and language supported by the Gemini App. Users who are signed in and over 18 can also select 'Add Gemini features' to include image or text generation. This allows for even more iterative changes as the project grows in complexity.

Moving forward, the focus for users will be on mastering the balance between AI generation and manual refinement. By using the code view and targeted selection tools, creators can ensure the final product matches their original vision. The transition from a paper sketch to a live app is now a matter of how well a user can guide the AI through those refinements.

Summary of tools

The Canvas environment provides a suite of tools designed for both beginners and more experienced users. For those who want to stay in the flow of the conversation, the chat interface handles broad changes. For those who want more control, the Code view and show console provide the necessary transparency into how the app is built.

The integration of image uploads as a starting point is a significant shift in how prototyping can begin. It allows for a more tactile, human-centric way to start a project. Instead of typing out a long list of requirements, a user can simply draw what they want and let the AI handle the heavy lifting of the initial coding.

Ultimately, the tool is designed to be a collaborative space. It combines the creative freedom of a sketch with the technical power of Gemini's code generation. By providing a preview window and sharing capabilities, Google is creating a loop where ideas can be visualized, tested, and distributed quickly.