How to Fix: Captions used

Captions used is an SEO check in the Image SEO category, and I will be honest about its weight: it is a lower-priority optimization. Handle your critical issues first. But captions are one of those small touches that, used well, lift engagement on exactly the pages where images carry the argument — so it earns a place on the list once the big rocks are moved.

What this check is actually about

This check looks at whether your images use captions — the visible text that sits beneath an image on the page. It is important to separate this from alt text, because people constantly conflate the two. Alt text is for accessibility and machines; it describes the image to screen readers and search engines. A caption is for the human reader, on the page, adding context they can see. This check is about the caption.

Captions are not needed on every image — a decorative background or an icon does not want one. They earn their place on images that carry meaning: a chart, a product shot with a detail worth naming, a photo that needs a “what am I looking at” line.

Why it matters for SEO

• Captions are among the most-read text on a page — readers scan them even when they skip body copy
• They add relevant on-page context near the image, reinforcing topical relevance naturally
• A well-captioned figure holds attention, feeding engagement signals
• They improve comprehension, which keeps readers on the page longer and reduces bounce

How to check where you stand

1. Review your key posts and pages — do meaningful images have a visible caption, not just alt text?
2. Confirm you are not confusing the caption field with the alt text field in the media library
3. Look at charts, diagrams, and product images specifically, where captions add the most
4. Check that captions say something useful rather than restating the obvious

How to fix this in WordPress

Difficulty Level: EASY – This fix is straightforward and can typically be completed by anyone with basic WordPress knowledge.

Estimated Time: varies

WordPress makes this trivial — the caption field is built into the block editor and the media library.

Step 1: Add captions where they add value

Select an Image block and type into the “Write caption…” field beneath it, or set the Caption field in the media library. Do this for images that carry information — not for every decorative graphic, which only adds clutter.

Step 2: Write captions worth reading

• Add context the image alone does not convey — the “so what,” not just the label
• Keep them concise; a caption is a line, not a paragraph
• Do not duplicate your alt text — the two serve different audiences

Step 3: Keep alt text separate and intact

1. Confirm every meaningful image still has descriptive alt text for accessibility and search
2. Clear your cache so the updated content is served
3. Re-run the SEO Roadmap audit to confirm the check passes

Recommended tools & plugins

• Yoast SEO – Comprehensive SEO plugin with image and readability checks
• Rank Math – Feature-rich SEO plugin with image SEO analysis
• Google Search Console – Free tool to monitor image search performance
• SEO Roadmap – Complete SEO audit and action plan tool

Common mistakes to avoid

• Confusing captions with alt text and filling the wrong field
• Captioning every image, including decorative ones, until the page feels noisy
• Writing captions that just repeat the heading or the obvious
• Adding captions but neglecting alt text, which matters more for accessibility and search

Need more help?

Captions are a quick win once your bigger image-SEO basics — compression, alt text, descriptive file names — are handled. If you are unsure where captions rank against your other tasks, a full SEO Roadmap audit will put this in its proper place in a prioritized plan.

This guide is part of the SEO Roadmap knowledge base – your complete resource for WordPress SEO optimization.