Finding a fresh image for every blog post is one of those tasks that sounds simple until you’re actually doing it. Stock photo sites return generic results you’ve seen a dozen times before, custom photography is expensive, and spending twenty minutes searching for something that’s only vaguely relevant is time nobody wants to give up.
AI image generators have changed this. Describe what you want, and the tool produces several options in seconds. No design skills required, no recurring stock library subscription, and the result is unique to your site rather than already appearing on thousands of others.
For WordPress sites the workflow is straightforward: generate the image, download it, upload it to the media library, set it as the featured image. Once you know which tools work and how to prompt them effectively, the whole process takes under five minutes per post.
Quick Answer
To generate AI images for your WordPress website, write a descriptive prompt in a tool such as Bing Image Creator, Canva AI, or Midjourney, download the result at the highest available resolution, upload it to your WordPress media library, add descriptive alt text, and set it as your featured image. Most major AI image tools allow commercial use under their standard terms, but check the specific platform’s terms before publishing.
Why AI Images Work for WordPress Sites
The practical case is straightforward. Stock photos are shared across thousands of sites — the image you’re about to use has almost certainly appeared on dozens of others already. AI-generated images are unique by default, which helps with brand consistency and gives posts a more original feel.
Cost matters for small sites too. A decent stock subscription runs £10–30 per month and still produces results that look like stock photos. AI tools, especially the free-tier options, produce images that can be styled to match your site’s tone at no recurring cost.
Consistency is the less obvious benefit. Once you settle on a prompt style — same colour palette, same visual mood — you can generate featured images that look like they belong together across your whole post archive. If you’re also using AI for content, combining it with image generation creates a tightly integrated publishing workflow. See how to use AI to write blog posts for WordPress for that side of the process.
How to Generate and Use AI Images in WordPress: Step by Step
Step 1 — Choose an AI Image Tool
Several tools generate images suitable for WordPress featured images and inline content:
- Bing Image Creator — powered by DALL-E 3 via Microsoft, free to use with a Microsoft account. Good output quality for both illustrative and photorealistic styles.
- Canva AI (Magic Media) — built into Canva’s free plan, convenient if you’re already using Canva for graphics. Downloads as PNG or JPG.
- Adobe Firefly — free tier with commercial use rights, integrates well with Adobe tools if you already use them.
- Midjourney — paid subscription, consistently produces the most polished results, especially for editorial or stylised images.
- Stable Diffusion — open-source models accessible through various platforms. The image models from Stability AI are among the most widely deployed in the industry.
For most WordPress site owners, starting with Bing Image Creator or Canva AI is the lowest-friction option — both are free and require no setup beyond an account login.
Step 2 — Write an Effective Prompt
Vague prompts produce generic results. Specific prompts produce usable images.
A weak prompt: “WordPress website on a laptop”
A strong prompt: “Flat illustration of a laptop on a desk, WordPress dashboard visible on screen, dark blue and white colour scheme, minimal background, no text in image”
Include: the subject, the visual style (flat illustration, photorealistic, 3D render, watercolour), the mood or colour palette, what to exclude, and composition notes if relevant. Add “no text in the image” to almost every prompt — AI tools often add illegible placeholder text otherwise.
Generate several variations and pick the best fit. Most tools let you regenerate with minor prompt adjustments at no extra cost. In my experience, over-described prompts sometimes produce cluttered results — start specific, then simplify if the outputs are too busy.
Step 3 — Download and Prepare the Image
Download at the highest resolution the tool offers. For featured images in WordPress, aim for at least 1200×628px — wide enough to display cleanly in your theme and in social sharing cards.
Rename the file to something descriptive before uploading: ai-wordpress-seo-illustration.png performs better for image SEO than download (3).png. Include the post topic in the filename.
If you want to serve the image in WebP format for faster loading, most performance plugins handle this conversion automatically on upload. Make sure your featured image is also configured correctly for social previews — how to add Open Graph and social sharing images in WordPress covers the setup.
Step 4 — Upload to WordPress and Add Alt Text
In WordPress, go to Media → Add New and upload your image. Before setting it as a featured image, open it in the media library and fill in the Alt Text field. Write a plain-language description of what’s in the image: “Flat illustration showing a WordPress admin dashboard on a laptop screen” is useful to a visitor using a screen reader. “AI image” is not.
Alt text matters for accessibility and image SEO. See how to add featured images in WordPress for the full workflow, including recommended image dimensions by theme type and how to set a global placeholder for posts without a featured image.
Step 5 — Set as Featured Image or Inline Image
To set a featured image: in the post editor, open the Settings panel in the right sidebar, scroll to Featured image, and click Set featured image. Select the image you uploaded and confirm.
For inline images — to illustrate a specific step or concept within the post body — insert an Image block, upload or select from the media library, and add alt text in the block sidebar.
Practical Tips
- Keep a “house style” prompt — same colour palette, same illustration style — and use it as a base for every new image. This is the fastest way to make a site’s featured images look cohesive without a designer.
- AI tools generate at fixed aspect ratios by default; check that the output ratio matches what your theme expects for featured images before you commit to a style.
- If you have several posts to publish, batch your image generation in one session — it’s significantly faster than switching between writing and generating for each post individually.
- When a prompt produces something close but not quite right, adjust one element at a time rather than rewriting the whole prompt. Small changes produce more predictable results.
Common Mistakes
Uploading low-resolution images. If a tool only offers small output sizes, don’t upscale artificially — it will look blurry in your theme. Use a higher-resolution export option or switch to a different tool for that image.
Skipping alt text. AI-generated images need alt text just like any other image. “AI illustration” is not descriptive enough. Write what’s actually in the image.
Prompts that are too short. “A blog post image about SEO” will produce something generic. Thirty seconds spent on a prompt typically produces noticeably better output than a three-word description.
A Note on Licensing
Most AI image tools allow commercial use of generated images under their standard terms. Bing Image Creator and Adobe Firefly are explicitly designed with commercial use in mind. Midjourney’s paid plans include commercial rights. Stable Diffusion outputs are generally permissive due to the open-source nature of the underlying models.
Check the specific terms of whichever tool you use before publishing images on a revenue-generating site. Platform terms change as these tools evolve, so reviewing them once a year is a reasonable habit.
If you’re building out the full visual and content side of a new site, the step-by-step guide to building a WordPress website covers images, design, and content strategy as part of the complete process.
Conclusion
AI image generation removes one of the more repetitive parts of running a WordPress blog — finding something that works for every post. Pick a tool, develop a prompt style that matches your site’s tone, and fold it into your publishing workflow. The result is faster content production and images that actually reflect your content rather than borrowed from a generic library.
Etienne Basson works with website systems, SEO-driven site architecture, and technical implementation. He writes practical guides on building, structuring, and optimizing websites for long-term growth.