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Alt text has long been associated with accessibility — a behind-the-scenes feature that ensures users relying on screen readers can understand the content of images. While that remains a critical function, its role is expanding in increasingly relevant ways to marketers. Today’s email clients, including Apple Mail and Gmail, use more advanced methods to display message previews. These systems often draw not only from subject lines, preview text, and image metadata. In this environment, well-written descriptions don’t just support accessibility — they contribute to how an email is summarized, interpreted, and prioritized in the inbox.
Beyond Compliance: Why Alt Text Quality Matters
Despite its growing importance, alternative text is often overlooked or inconsistently applied. It’s not uncommon to see placeholders like “image1.jpg” or vague descriptors such as “photo” or “graphic.” While these may satisfy technical requirements, they do little to enhance the user experience or support your messaging.
Common challenges include:
Missing or empty attributes, resulting in poor screen reader experiences and vague previews.
Generic or overly broad language, which provides no meaningful context.
Manual inconsistencies can reduce content quality and introduce errors across campaigns.
As inbox environments evolve, these shortcomings become more noticeable and impactful. Descriptions are increasingly part of the first impression your email makes. It can differ between a reader opening your email or scrolling past it.
A More Strategic Approach
When treated as part of a broader content strategy, alternative text can reinforce brand voice, support clarity, and contribute to stronger engagement. Clear, specific descriptions make your message more inclusive and help ensure that it’s understood and presented accurately, even when images are not displayed.
Effective alt text:
It enhances the experience for users with visual impairments or those using privacy tools that block images.
Supports better inbox previews, especially in platforms that generate summaries dynamically.
Reduces confusion and improves overall clarity across email campaigns.
Demonstrates attention to detail and reinforces brand professionalism.
Improves email deliverability and prevents your email from landing in the spam folder.
This is particularly valuable in high-volume or high-visibility campaigns, where consistency and quality are critical.
Moving Forward
To address these challenges, incorporating AI into your content development and quality assurance processes can significantly improve the quality of your alt text and reduce errors. AI can check image descriptions and suggest improvements. This helps improve the quality of alt text and reduces the risk of errors, making it easier to meet accessibility standards.
An AI-powered solution works by analyzing template documents or completed HTML, generating a list of recommendations based on the context and intent of the image. Features like:
Automated heat maps that highlight weak or missing alt text,
Can include a glossary for a more detailed explanation of recommendations for new users,
Best-practice templates for common marketing use cases and
…make it easier to maintain quality across campaigns while saving time and reducing risk.
The ability to standardize and optimize alt text at scale — without sacrificing clarity or nuance — represents a practical and modern approach to marketing operations. It ensures that each image reinforces the message rather than becoming a missed opportunity or a source of confusion.
Get started with AI Tools for Image Alternative Text
You can use almost any AI tool to check the quality of your alt text. To help you get started, we recommend using a good prompt (which we’ll provide at the end of this article), or you may use the 4TM Alternate Text Checker Custom GPT developed by 4Thought Marketing. This Custom GPT is designed to check if content templates include high-quality alt text and can be used on HTML code.
Moving Forward
Alternative text may not be the centerpiece of an email campaign, but their impact is meaningful. They improve accessibility, enhance user experience, and increasingly contribute to how content is perceived in the inbox. They also have the potential to improve email deliverability. Marketers who give this element the same strategic attention as other content elements and adopt modern, AI-powered tools to support that process will be better positioned to meet evolving standards, reach broader audiences, and present their messages more effectively across every device and inbox.
Alt Text Checker Prompt
You are an accessibility and SEO expert specializing in HTML content. Your task is to analyze the provided alt text attributes in the images for accessibility and SEO compliance. Follow these best practices: 1. Choose alt text language as per the content language used in a document, PDF, or the HTML content language 2. Descriptive Language & Context Relevance: Use concise, accurate language that clearly describes the image’s content and purpose, including any links present. Standards & Compliance:Ensure alt text adheres to ADA compliance and WCAG 2.0 guidelines. 3. The alt text should be informative for visually impaired users using concise. 4. With Apple Intelligence introducing AI Summaries and Gmail’s Automatic Extraction, your alt text prompt should be adjusted to: Optimize for machine readability (AI Summaries & SEO) 5. Ensure clarity in all-image emails 6. Enhance AI-generated preview text accuracy 7. Character Count Limit: Keep alt text within 90 characters. 8. Decorative Images: If an image is decorative, confirm the alt attribute is either empty or managed appropriately. 9. Output Requirements:Alt Text Improvement Table, Heatmap Table. a) For Alt Text Improvement Table: Columns: Section/Element, Original Alt Text, Analysis, Suggested Alt Text Provide an analysis of the current alt text along with a suggested improvement. b) For Heatmap Table: Columns: Section/Element, Alt Text, Analysis Use heatmap indicators (🟢, 🟡, 🔴) with a short explanation.
Glossary: Include definitions and examples for terms used in the analysis.
Note: For decorative images, an empty alt attribute is recommended.
2. Heatmap Table in a formatted way as alt text improvement
Glossary: 1. Alt Text: Text alternative for images to convey content for users who can’t see them. Example: "Promotional banner featuring seasonal discounts with a 'Shop Now' link." 2. Banner Image: A prominent image used on webpages (often at the top) that typically includes key messaging or links. 3. ADA Compliance: Adhering to the Americans with Disabilities Act guidelines to ensure digital content is accessible to all users, including those with disabilities. 4. WCAG 2.0: Web Content Accessibility Guidelines version 2.0; a set of recommendations for making web content accessible. 5. Descriptive Language: Use of detailed, specific language to clearly describe an image’s content. Example: "Welcome banner displaying company mission with a link to the About page." 6. Context Relevance: Ensuring that the alt text reflects the image’s purpose and any associated functionality (like clickable links). 7. Decorative Image: An image used solely for visual enhancement with no essential informational value; such images should have an empty alt attribute to avoid distraction.
The American Privacy Rights Act introduces a unified federal privacy standard, reshaping marketing compliance with stronger consumer rights, consent requirements, and a push toward privacy by design and accountability.
Privacy first third party risk management aligns vendor controls with your standards, improves compliance and monitoring, and turns external dependencies into measurable trust across the entire vendor lifecycle.