How to Add Alt Text in PowerPoint: Accessibility Boost in 3 Simple Clicks

Adding alt text in PowerPoint turns your slides from visually dependent to universally accessible. ✨ I’ve helped dozens of presenters make their decks screen-reader friendly—it’s the one tweak that makes the biggest difference for colleagues using assistive tech.

The process is simpler than most assume, especially when you know where to look in each version.

Microsoft baked alt text support directly into PowerPoint 2016 and later, hiding it behind the Select pane (not the Alt Text button you might expect). On Windows, right-click any image, choose Format Picture, then navigate to Alt Text—there’s your editing window.

Mac users find it under Picture Format after selecting the image. The field expands to 123 characters by default, but you can type up to 5,000 if needed.

Good alt text describes the image’s purpose, not just its contents. Instead of “blue chart,” write “Quarterly revenue growth by region, showing 20% increase in Western markets.”

This helps screen readers convey meaning, not just visuals. Pro tip: Test your slides with NVDA or VoiceOver to hear how it sounds—you’ll catch vague descriptions instantly.

Troubleshooting? Missing alt text warnings appear as red icons in the Select pane. Right-click any to auto-generate a description (though I recommend editing it yourself). For older versions, you’ll need the Accessibility Checker add-in—enable it under File > Options > Add-ins.

The time investment pays off when every attendee, regardless of ability, understands your message.

What you need

Step-by-Step instructions for adding alt text in PowerPoint

Here's the straightforward process to make your presentations fully accessible in seconds.

Open your PowerPoint presentation and navigate to the slide containing the image. Click directly on the image to select it—you'll see the image borders appear with resize handles. This selection is crucial because alt text is image-specific and won't apply to other elements on the slide.

If your image is part of a complex graphic, right-click it and choose Group to ensure you're editing the entire graphic as one unit. This prevents accidental edits to individual components when you only want to modify the whole graphic's alt text.

With the image selected, navigate to the Format tab in the PowerPoint ribbon. In the Arrange group, locate the Format Selection button (it looks like a small rectangle with a paint roller icon). Click this button to open the Format Picture pane on the right side of your screen.

In the Format Picture pane, scroll down to the Alt Text section. Here you'll find two fields: Title and Description. The Description field is where you'll enter your alt text. Click inside this field to begin typing your descriptive text.

For the Description field, write a concise but informative text that describes the image's content. Keep it under 125 characters for optimal readability by screen readers. For example, if your image shows a bar chart comparing sales quarters, describe it as "Bar chart showing Q1-Q4 sales comparison with Q2 having the highest value."

In the Title field, you can add a brief title for the image, such as "Sales Performance 2023." This title appears as a tooltip when users hover over the image. Use this field for context that complements your alt text description.

After entering your alt text, click outside the Format Picture pane to close it. To verify your alt text is properly set, select the image again and check that the text appears in the Alt Text section when you reopen the Format Picture pane.

Save your presentation by pressing Ctrl + S or navigating to File > Save. This ensures your alt text is preserved for future editing sessions. For presentations with multiple slides, repeat this process for each image that requires descriptive text.

To confirm your alt text works as intended, enable PowerPoint's Immersive Reader feature by going to View > Immersive Reader. This tool reads your presentation aloud and will announce the alt text when it encounters images. Listen for your descriptive text to ensure it's clear and helpful.

For a more thorough test, use a screen reader like NVDA or JAWS to navigate through your presentation. These tools will read your alt text aloud, giving you confidence that your accessibility efforts are effective for users who rely on them.

Tips & tricks for perfect alt text in PowerPoint presentations

Making your presentations accessible doesn't have to be complicated—these pro tips will help you create alt text that actually works for everyone.

Selection Precision: I can't stress enough how important it is to select the exact element you want to describe in Step 1. If you have a complex graphic with multiple components, always right-click and choose Group first. This ensures your alt text applies to the entire graphic rather than just one part. I've seen presentations where different elements had conflicting alt text because the graphic wasn't properly grouped—don't make that mistake!

Character Count Matters: The 125-character limit in Step 3 is non-negotiable for screen reader compatibility. Practice writing concise descriptions by focusing on the most important visual elements first. For example, instead of "A colorful bar chart showing sales data," try "Bar chart comparing Q1-Q4 sales with Q2 highest." Every character saved gives you room for more crucial details.

Title vs Description: Use the Title field in Step 3 for context that complements your description, not repeats it. For instance, if your image is "Sales Performance 2023," don't describe the year in the description field. Screen readers announce both fields sequentially, so keep them complementary. This dual-field approach makes your alt text more informative without overwhelming users.

Verification Shortcut: After completing Step 4, use this quick verification trick: press Alt + Tab to switch to another application, then return to PowerPoint. The alt text should appear as a tooltip when you hover over the image. If it doesn't, you'll know you need to recheck your formatting. This simple step catches most setup errors instantly.

Frequently asked questions

Got questions about adding alt text in PowerPoint? You’re not alone! Here are answers to the most common queries to help you navigate alt text like a pro.