How to Add Alt Text in Adobe InDesign

Here’s something most people don’t know: 56.6% of home pages tested fail WCAG accessibility standards because of missing image alt text — and that’s not just a compliance problem. It’s a visibility problem, a credibility problem, and in some industries, a legal problem.

If you’re working in Adobe InDesign — whether you’re building PDFs, digital publications, or interactive documents — getting alt text right is non-negotiable.

The good news? It’s easier than you think. This guide breaks down exactly how to add alt text in InDesign, why it matters more than ever in 2025, and the fastest ways to do it right.

Let’s get into it.

Why Alt Text in InDesign Actually Matters

Before we get into the how, let’s talk about the why — because understanding the stakes makes you care about the execution.

Alt text (alternative text) is a written description of an image embedded in your file. When someone uses a screen reader, assistive technology reads the alt text aloud so visually impaired users still understand what the image communicates.

Here are the numbers that should make you take this seriously:

• 7.6 million people in the United States live with visual disabilities (National Federation of the Blind)
• 98.1% of home pages tested in the WebAIM Million report have detectable WCAG 2 failures
• Missing alt text is the fourth most common WCAG failure across the web
• ADA-related digital accessibility lawsuits have climbed consistently year over year, with over 4,600 federal lawsuits filed in 2023 — a record high
• Screen reader usage is growing, with an estimated 2.2% of all web users relying on them as their primary way of navigating content

Beyond legal compliance, alt text directly impacts SEO. Search engines can’t “see” images — they read the alt text. If you’re exporting InDesign documents to PDF or HTML, those alt text descriptions get indexed. That’s free discoverability you’re leaving on the table if you skip this step.

What Types of Images Need Alt Text in InDesign?

Not every visual element needs descriptive alt text. Here’s how to think about it:

Images that need alt text:

• Photos that communicate meaning or context
• Charts, graphs, and infographics
• Icons used as functional elements
• Diagrams and illustrated instructions
• Product images or promotional visuals

Images that should be marked as decorative (empty alt text):

• Pure design elements like background textures, dividers, or decorative borders
• Repeated visual elements that add no informational value
• Watermarks and logos that appear multiple times

The distinction matters. Decorative images marked correctly allow screen readers to skip them — reducing cognitive load for visually impaired users and making the document cleaner to navigate.

How to Add Alt Text in Adobe InDesign — Step by Step

Method One: Using the Object Export Options Panel

This is the most common and flexible method. It works for individual images and gives you full control.

Step one: Select the image frame

Click on the image you want to add alt text to. Make sure you’re selecting the frame (the container), not just the image inside it. You’ll see the blue selection handles appear around the frame.

Step two: Open Object Export Options

Go to Object > Object Export Options in the top menu bar. A dialog box will open with three tabs: Alt Text, Tagged PDF, and EPUB and HTML.

Step three: Click the Alt Text tab

This is where you write your description. By default, the dropdown is set to “From XMP: dc:description” or “None” — depending on your version of InDesign.

Step four: Choose your Alt Text source

You have three options in the dropdown:

• Custom — You write the alt text yourself (recommended for precise control)
• From Structure — InDesign pulls text from your document’s XML structure
• From XMP Metadata — Pulls alt text from the image’s embedded metadata

Select Custom and type your description in the field that appears.

Step five: Write clear, descriptive alt text

Keep it concise. Describe what the image shows and why it matters in context. Aim for 125 characters or fewer. Don’t start with “image of” or “picture of” — screen readers already announce that context.

Bad example: “Image of a chart”

Good example: “Bar chart showing Q3 sales increase of 34% compared to Q2”

Step six: Click Done

That’s it for this image. Repeat for each image in your document.

Method Two: Using the Articles Panel for EPUB Export

If you’re exporting to EPUB or creating accessible digital publications, InDesign’s Articles panel gives you an additional layer of control over reading order and alt text.

Step one: Open the Articles panel

Go to Window > Articles to open the panel.

Step two: Add your content to an article

Drag your image frames (and text frames) into the Articles panel in the order you want them read. This controls the logical reading order for screen readers.

Step three: Apply alt text through Object Export Options

For each image inside your article, right-click on it in the Articles panel and select Object Export Options to add your alt text.

This method is especially powerful for magazines, reports, and long-form documents where reading order matters as much as image descriptions.

Method Three: Adding Alt Text via XMP Metadata (Batch Workflow)

If you’re managing a large document with dozens of images, adding alt text one by one gets tedious fast. Here’s a smarter approach.

Step one: Embed metadata in your source images

Use Adobe Bridge or Adobe Photoshop to add metadata to each image file before placing it into InDesign. In Photoshop, go to File > File Info and add a description in the “Description” field. This gets written into the image’s XMP metadata.

Step two: Place images into InDesign

When you place these images, InDesign can reference that XMP description as the alt text automatically.

Step three: Set Object Export Options to pull from XMP

Select each image frame, open Object Export Options, and from the Alt Text dropdown, choose From XMP: dc:description. InDesign will pull the description you added in Photoshop or Bridge.

This workflow saves significant time on large projects and keeps your alt text consistent with your asset library.

How to Check If Your Alt Text Is Working Before Export

Adding alt text is only half the battle. You need to verify it’s actually embedded correctly in your final export. Here’s how.

For PDF exports:

When you export to PDF (File > Export > Adobe PDF), make sure you check the Create Tagged PDF option in the General tab. Tagged PDFs preserve the alt text you’ve added so screen readers can access it.

After exporting, open the PDF in Adobe Acrobat and run the accessibility checker: Tools > Accessibility > Full Check. Any missing alt text will be flagged as an error.

For EPUB exports:

When exporting to EPUB (File > Export > EPUB), InDesign transfers your Object Export Options settings directly. Validate your EPUB file with an accessibility checker like DAISY’s Ace by DAISY tool.

For HTML exports:

InDesign transfers alt text to the alt attribute on <img> tags in the HTML output. Check your exported HTML file to confirm the attributes are populated correctly.

Common Alt Text Mistakes and How to Avoid Them

Even when people know to add alt text, they often do it wrong. Here are the most frequent errors and how to fix them.

Mistake: Writing vague descriptions

“Graph showing data” tells a screen reader user nothing. Be specific. Include the key data point or takeaway the image communicates.

Mistake: Stuffing alt text with keywords

Alt text is not an SEO keyword field. Writing “lead generation strategy B2B marketing sales funnel conversion rate” as alt text for a chart is both useless for accessibility and actively penalised by search engines for keyword stuffing.

Mistake: Leaving alt text blank on important images

An empty alt text field signals to screen readers that the image is decorative. If the image matters — if removing it would reduce a reader’s understanding — it needs a description.

Mistake: Forgetting to enable Tagged PDF on export

The most common technical error. You can add perfect alt text in InDesign and lose all of it if you export without enabling the Tagged PDF option. Always double-check your export settings.

Mistake: Ignoring reading order

Even with perfect alt text, a document where images and text appear out of logical sequence in the tag tree creates a confusing experience. Use the Articles panel or the Tags panel to verify reading order on complex layouts.

Alt Text Best Practices for InDesign Documents in 2025

These principles apply whether you’re creating a one-page flyer or a 300-page annual report:

Keep it under 125 characters when possible. Longer descriptions increase cognitive load without adding proportional value. For complex images like detailed infographics, consider adding an extended description in the body text instead.

Write for context, not just content. The best alt text explains why the image is there, not just what it shows. “Team collaborating in open office” is less useful than “Three-person marketing team reviewing campaign analytics dashboard.”

Treat decorative images consistently. Set them all to empty alt text with the “Decorative” checkbox. This is a WCAG requirement, not optional.

Test with actual screen readers. NVDA (free) and JAWS are the two most widely used screen readers among visually impaired users. Testing your exported PDFs or EPUBs with real assistive technology reveals issues no automated checker will catch.

Document your alt text in a content audit. For large ongoing projects, maintain a spreadsheet tracking which images have alt text, what the descriptions say, and when they were last reviewed. According to WCAG 2.1 guidelines, alt text should be reviewed whenever an image’s context changes.

The Business Case for Accessible InDesign Documents

If you’re still thinking of accessibility as a “nice to have,” here’s the business case:

• The global accessible tech market is worth over $500 billion — organisations that design for accessibility from the start reach a larger audience by default
• Companies with strong accessibility practices have been shown to outperform peers by up to 28% in total shareholder return over a four-year period (Accenture)
• 71% of disabled customers will leave a website immediately if it’s inaccessible — that same behaviour applies to digital documents
• US federal contractors are required to meet Section 508 standards for all digital content, and similar requirements exist across the EU under the European Accessibility Act

Getting alt text right in InDesign isn’t just about compliance. It’s about building materials that work for every reader — and protecting your organisation from avoidable legal and reputational risk.

Conclusion

Adding alt text in Adobe InDesign is one of those things that takes fifteen minutes to learn and saves you from real problems — legal, reputational, and audience-reach problems — indefinitely.

Here’s the core takeaway: select your image frame → open Object Export Options → choose Custom alt text → write a clear, specific description → export with Tagged PDF enabled. That’s the full loop.

The accessibility gap is real. Over 56% of websites and documents fail on alt text alone. The teams and organisations that close that gap aren’t just being compliant — they’re reaching every reader, every time.

Fix alt text in your InDesign files today. Then make sure every other part of your outbound system is built with the same precision. If you’re not sure whether your lead generation approach is reaching the right people consistently, book a strategy meeting with Salesso — we’ll show you exactly what a complete targeting, campaign design, and scaling system looks like in practice.