Updated: April 3, 2026 By: Marios
Right now, somewhere on your WordPress site, there are images with no alt text.
Maybe a dozen. Maybe hundreds. On one site I audited last month, 847 out of 1,200 media library images had empty alt text fields — over 70% of the entire library.
Each missing alt text is three problems at once: a screen reader user who encounters a blank void instead of a description, a Google image search result you’ll never appear in, and — as of June 2025 — a potential legal compliance issue under the European Accessibility Act.
Writing alt text manually for every image takes roughly 30-60 seconds per image if you’re thoughtful about it. For a site with 500 images, that’s 4-8 hours of tedious work. For a WooCommerce store with 2,000 product images, it’s a full work week.
AI can do the same job in minutes. Not someday — right now, with WordPress plugins that are already available.
This guide covers how to audit your existing alt text coverage, the best methods to generate alt text with AI in bulk, and how to make sure the quality is good enough for both accessibility and SEO.
Why this can’t wait
The European Accessibility Act is now in effect
The EAA came into force in June 2025. It requires websites that sell products or services to EU consumers to meet accessibility standards — which includes providing text alternatives for non-text content. That means alt text for images.
The directive applies to any business targeting EU customers, regardless of where the business is based. If your WooCommerce store ships to Europe, or your SaaS product has European users, your image alt text isn’t just an SEO nicety anymore. It’s a compliance requirement.
Google’s AI systems need alt text to understand your images
Google’s image search and AI Overviews rely heavily on alt text to understand what your images show. Without alt text, your images are invisible to both traditional image search and the AI systems that generate visual answers.
More importantly, alt text is one of the signals AI systems use when deciding whether to cite your content. A well-optimized page with descriptive image alt text demonstrates attention to detail and accessibility — both trust signals in the E-E-A-T framework.
Screen readers depend on it
This is the reason alt text exists in the first place. Visually impaired users navigate the web using screen readers that read alt text aloud. An image without alt text is announced as “image” or simply skipped — leaving the user confused about what they’re missing. This isn’t an edge case: over 2 billion people globally have some form of vision impairment.
Step 1: Audit your current alt text coverage
Before generating anything, find out how bad the situation actually is.
Manual check (small sites)
Go to WP-Admin → Media Library. Switch to list view. Look at the Alt Text column (if it’s not visible, click Screen Options and enable it). Scroll through and note how many images have empty alt text fields.
Plugin-based audit (recommended for any size)
Several AI alt text plugins include an audit feature that scans your entire media library and tells you exactly how many images are missing alt text.
SOOZ – AI for SEO shows a dashboard with your overall SEO coverage, including a specific count of images without alt text. Install the plugin, go to SOOZ → Dashboard, and you’ll see the number immediately.
AltText.ai shows how many images need processing when you open the Bulk Generate tool. Install the plugin, go to AltText.ai → Bulk Generate, and the queue count tells you how many images lack descriptions.
Altify AI includes a scan feature that identifies images with missing alt text across your posts, pages, and WooCommerce products.
Record your baseline number. You’ll want to measure the improvement after processing.
Step 2: Choose your approach
There are three distinct methods for AI alt text generation on WordPress, each with different trade-offs.
Approach 1: Dedicated alt text plugin (easiest)
These plugins do one thing — generate alt text — and they do it well. They’re the fastest path to a fully-optimized media library.
AltText.ai is the most established option, with 20,000+ WordPress sites using it. It automatically generates alt text when you upload new images, supports bulk processing of your existing library, integrates with WooCommerce to include product names in alt text, pulls focus keyphrases from Yoast, Rank Math, AIOSEO, and SEOPress, and supports 130+ languages with WPML and Polylang compatibility.
Setup takes under 2 minutes: install from WordPress.org, create a free account at alttext.ai, paste your API key into the plugin settings, and you’re running. New uploads get alt text automatically. For existing images, click Bulk Generate and let it process your library.
Pricing works on a credit system — each image costs one credit. The free plan includes a trial allocation. Paid plans start at a few dollars per month for small sites.
AutoAlt is a newer option from a German company, notable for its strict GDPR compliance — images are processed and then deleted, never stored or used for AI training. It supports 100+ languages, includes smart keyword controls (add mandatory keywords, block competitor names), and generates alt text that meets WCAG 2.1 Level AA standards.
SOOZ – AI for SEO takes a broader approach. Beyond alt text, it generates meta titles, descriptions, focus keyphrases, and social media tags. Its SEO Autopilot mode can process your entire site’s metadata on a schedule. If your alt text problem is part of a larger metadata gap, SOOZ handles everything at once. It has a generous free tier — when your credits drop below 100, the plugin adds 5 free credits daily.
Approach 2: OpenAI Vision API directly (most flexible)
If you already have an OpenAI API key (perhaps from your WordPress 7.0 AI provider setup), you can use plugins that connect directly to OpenAI’s vision models to generate alt text.
AI Image Alt Text Generator with OpenAI Vision Models is a lightweight, free plugin that sends your images to OpenAI’s GPT-4o or newer vision models and returns alt text. It supports bulk generation, automatic generation on upload, and you can choose which OpenAI model to use (GPT-4o Mini for cost efficiency, GPT-4o for quality).
The advantage: you control the AI model and prompt. You can add custom instructions like “Describe this product image in a way that includes the brand name and primary color” or “Focus on the subject’s action, not the background.”
The cost: OpenAI charges per image processed. Using GPT-4o Mini, each image costs approximately $0.001-0.003 depending on resolution. Processing 500 images costs roughly $0.50-1.50. This is extremely cheap, but you need to manage your own API key and monitor usage.
Approach 3: AI Engine for custom workflows (most control)
If you’re already running AI Engine for your chatbot or content generation (from our earlier tutorials), you can use it for alt text generation as part of a broader workflow.
AI Engine doesn’t have a dedicated alt text feature, but its content generation capabilities can be combined with Uncanny Automator to create an automation: when a new image is uploaded, send it to the AI with a custom prompt (“Describe this image in 10-15 words for use as alt text, focusing on the subject and action”), and save the response as the image’s alt text.
This approach is more complex to set up but gives you complete control over the prompt, model, and output format. It’s best suited for developers or agencies who want alt text generation integrated into a larger automated workflow.
Step 3: Process your existing library in bulk
Whichever approach you’ve chosen, the bulk processing step works roughly the same way.
Before you start
Back up your database. Alt text is stored in the wp_postmeta table. Before bulk-updating hundreds of entries, create a database backup. All major backup plugins (UpdraftPlus, BackWPup, BlogVault) handle this in one click.
Decide on overwrite rules. Most plugins offer a choice: only fill empty alt text fields, or overwrite existing alt text too. Unless your existing alt text is genuinely bad, choose “only fill empty” to preserve any manual work you’ve already done.
Set your language. If your site targets a non-English audience, configure the target language before processing. Most plugins support this in their settings. Generating alt text in the wrong language means redoing the entire batch.
Running the bulk process
In AltText.ai: Go to AltText.ai → Bulk Generate. The plugin shows you how many images need processing. Click Start and wait — processing 500 images typically takes 10-20 minutes.
In SOOZ: Go to SOOZ → Media. Click “Set up SEO Autopilot,” select Media as the content type, and start bulk generation. SOOZ processes images in batches automatically.
In the OpenAI Vision plugin: Go to Media Library → select images → choose “Generate Alt Text” from the bulk actions dropdown. Processing time depends on your selected model and image count.
What to expect
AI-generated alt text is good but not perfect. Across the plugins I’ve tested, roughly 85-90% of generated alt text is accurate and usable. The remaining 10-15% falls into three categories:
Vague descriptions. The AI writes “a building” when it should write “a Victorian brick townhouse.” This happens most with generic or zoomed-out images.
Incorrect details. The AI misidentifies a specific location, brand, or object. One user reported that the AI described a street in their Dutch town as being in Belgium. These errors are uncommon but real.
Over-literal descriptions. The AI writes “a white background with a red circle in the upper left corner” when the image is actually a logo that should be described as “Company Name logo.” Logos and graphics consistently produce worse alt text than photographs.
This is why Step 4 exists.
Step 4: Review and refine the results
AI-generated alt text should be reviewed — not blindly accepted. Here’s an efficient review process:
Prioritize your review
You don’t need to review every image immediately. Focus your review time on product images (inaccurate alt text here affects sales and compliance), images on your highest-traffic pages, hero images and featured images (these are the most visible), and any images where the AI flagged low confidence.
Batch review in the Media Library
Switch to list view in WP-Admin → Media. Sort by date modified (your recently-processed images will be at the top). Scan through the alt text column, opening any that look too short, too vague, or suspicious.
What good alt text looks like
Good alt text is concise (under 125 characters), descriptive (explains what the image shows, not just what it is), contextual (relevant to the surrounding content), and specific (uses actual details, not generic descriptions).
Bad: “Image of a person” Acceptable: “Woman using a laptop at a desk” Good: “Content strategist reviewing WordPress analytics on a MacBook in a home office”
The last version includes the subject’s role (content strategist), the action (reviewing analytics), the tool (WordPress), the device (MacBook), and the setting (home office). That’s the level of specificity that benefits both accessibility and SEO.
Edit in bulk
Both AltText.ai and SOOZ include history/review pages where you can scan through generated alt text and edit inline without opening each image individually. This is much faster than clicking into each media item.
Step 5: Set up ongoing automation
The bulk process handles your existing library. But you also need alt text generated for every new image going forward.
Auto-generate on upload
Most alt text plugins support automatic generation when you upload a new image. Enable this in your plugin settings:
In AltText.ai: The plugin generates alt text automatically for every new upload by default. No additional configuration needed.
In SOOZ: Enable SEO Autopilot for new content, and new images get alt text as part of the automated SEO workflow.
In the OpenAI Vision plugin: Enable “Auto-generate on upload” in Settings → Media.
Schedule regular scans
Some images slip through — uploaded via FTP, imported by another plugin, or added through a theme’s media uploader. Set up a weekly or monthly scan to catch these:
In SOOZ, the SEO Autopilot runs on a schedule you define. In AltText.ai, you can run bulk generation periodically to catch new images. Altify AI includes a daily background scan for missing alt text.
WooCommerce product images
If you add products regularly, make sure your alt text automation covers WooCommerce product images, including gallery images and variation images — not just featured images. AltText.ai and Altify AI both support this explicitly.
The cost breakdown
Here’s what each approach actually costs for a site with 500 images needing alt text:
AltText.ai: Varies by plan. The free trial covers an initial test. Paid plans start at a few dollars per month. For 500 images, expect roughly $5-15 depending on your plan.
SOOZ – AI for SEO: Free for most small and medium sites. When credits drop below 100, the plugin adds 5 free credits daily. For a one-time bulk process of 500 images, you’d need to process over several weeks on the free tier or purchase credits for faster processing.
OpenAI Vision plugin (BYOK): Using GPT-4o Mini, 500 images costs approximately $0.50-1.50 in API fees. This is by far the cheapest option if you already have an OpenAI API key.
Altify AI: Offers an offline mode that generates alt text from image metadata without any API calls — completely free but with lower quality. AI mode uses OpenAI and costs per-image based on your own API key.
Compare any of these to the manual alternative: 500 images × 45 seconds average = 6.25 hours of tedious manual work. At even $20/hour, that’s $125 in time cost. The AI approach is cheaper by 10-100x.
The result
A site that goes from 70% missing alt text to full coverage sees measurable improvements across three dimensions:
Accessibility. Every image on your site is now described for screen reader users. You’ve moved from non-compliant to meeting WCAG 2.1 Level AA standards for text alternatives.
SEO. Your images become indexable by Google Image Search and contribute to your page-level relevance signals. Alt text also strengthens your pages for AI Overviews, which use image context when generating visual answers.
Legal compliance. You’ve addressed the image accessibility requirements of the European Accessibility Act and the Americans with Disabilities Act. While alt text alone doesn’t guarantee full compliance, it eliminates one of the most common and easily fixable violations.
All of this from a process that takes less than an hour to set up and runs automatically going forward. This is the definition of a quick win — high impact, low effort, immediately measurable.
