Guide

Gemini Canvas: how to prompt it to build a whole slide deck

Published 7 October 2026

Hands typing on a laptop that shows a grid of colourful slide thumbnails, beside printed storyboard sheets on a wooden desk

Short answerGive Gemini Canvas the audience, the goal and either your source material or a topic, and ask for a set number of slides. It builds a themed deck with text, layout and images that you then open and finish in Google Slides.

Google added presentation generation to Gemini's Canvas, the workspace inside the Gemini app. Instead of writing a slide-by-slide outline yourself and pasting it into Google Slides, you can ask Canvas for the whole deck in one prompt, or upload a document and let it build slides from that. It comes back with a themed set of slides, with text, layout and images already in place, and a button to export straight into Google Slides for editing.

It rolled out to Pro subscribers first, with free users getting it over the following weeks, and it works on both personal and Google Workspace accounts. If you don't see it yet, look for Canvas in the Gemini app and check for a presentation option when you start a new one.

This guide covers how to prompt it well, since a vague request gets you a generic deck you'll end up rebuilding anyway.

What Canvas actually does

Canvas builds the deck from one of two things:

A prompt. You describe the topic, the audience and the goal, and it writes the content and picks a layout and images for each slide.
A document. Upload a report, a set of notes or a research paper, and Canvas pulls out the key points and turns them into slides.

Either way, what comes out is a starting point, not a finished deck. The structure and the first draft of the text are usually solid. The exact wording, the image choices and anything with a specific number in it are worth checking before you present.

Write the brief before you ask for slides

The biggest difference between a deck you can use and one you have to rebuild is whether you gave Canvas a real brief first. Compare these two prompts:

Weak:

prompt

Make a presentation about our Q3 results.

Stronger:

prompt

Build a 10-slide presentation on our Q3 sales results.

Audience: the leadership team, who care about revenue, churn and next quarter's plan.
Goal: get agreement on cutting the underperforming product line.
Tone: direct, numbers-first, no filler slides.
Structure: a title slide, one slide per key metric, a risks slide, and a clear recommendation on the last slide.

Use only the figures in the document I've attached. If a number isn't in it, say "not in the data" instead of estimating.

The second version works because it answers the three questions a real presentation always needs: who is it for, what should they do after watching it, and what is the one thing it has to say. Building a presentation outline first, even as plain text, is a good way to think this through before you ask Canvas for the deck itself.

A copy-ready prompt for a work deck

prompt — 6 blanks

Create a presentation titled "[TITLE]" for [AUDIENCE].

Goal: [WHAT THEY SHOULD DECIDE OR DO AFTERWARDS]
Number of slides: [NUMBER]
Must include: a title slide, an agenda, [KEY SECTIONS], and a closing slide with next steps.
Tone: [e.g. formal, friendly, data-heavy]

Base the content on the attached [DOCUMENT TYPE]. Where the document doesn't cover something, say so instead of inventing it.

Attach the source document in the same message if you have one. Canvas reads it alongside the prompt, and the deck sticks closer to your real content than when you describe the topic from memory.

A copy-ready prompt for a pitch deck

Investor and sales decks need a tighter structure, since every slide is competing for a few seconds of attention.

prompt — 4 blanks

Create a 10-slide pitch deck for [COMPANY], a [ONE-LINE DESCRIPTION OF WHAT IT DOES].

Audience: [SEED INVESTORS / A CUSTOMER / A PARTNER]
Include: problem, solution, how it works, market size, traction, team, the ask.
Key facts to use: [YOUR REAL NUMBERS, e.g. users, revenue, growth rate]

Keep each slide to one idea and a short headline that states the point, not a label. End with a clear ask.

This follows the same shape as the pitch deck outline prompt: one headline per slide that could stand alone, rather than a topic name with four bullets under it.

Fixing what comes back

The slides are too wordy. Add "Maximum 15 words per bullet, maximum 4 bullets per slide" to your next prompt, or ask Canvas to "shorten every slide to half the current text."

It invented a statistic. This is the one to watch for. Tell it up front: "Use only numbers from the attached document. Write 'not stated' rather than estimate." Then check every number before you present.

The images don't fit the topic. Ask for a regenerate on just that slide: "Replace the image on slide 4 with something that matches [DESCRIPTION]," rather than rebuilding the whole deck.

The structure is wrong for your audience. Rather than editing slide by slide, go back to the brief and add the missing constraint, for example "this audience has 10 minutes, so cut to 6 slides," then ask for a fresh version.

You need a specific slide type. Build individual slides with image prompts once the structure is right: an agenda slide to open with, or a quote slide to break up a long section.

When to build slide by slide instead

A full-deck prompt works best for a first draft or a deck you'll heavily edit anyway. For a deck where the visual design matters more than speed, such as a pitch deck's cover slide or a closing thank-you slide, it's often faster to prompt each slide as its own image and assemble them yourself. The pitch deck cover slide prompt is a good example: a single, specific image prompt gets a sharper result than asking Canvas to "make the cover slide look professional."

Where to go from here

If you want the same idea for a different tool, see how Claude builds docs and slides. For more slide and deck images, browse the image generation prompts collection, and the prompt builder can turn any of the templates above into a prompt for your own topic.