When to use this prompt
When you’re creating or optimizing blog posts, landing pages, or articles that include multiple images and need SEO-friendly alt text.
When your goal is to improve image search visibility and accessibility compliance (e.g., ADA or WCAG).
When conducting SERP analysis or content audits to strengthen keyword targeting and metadata quality.
When building or updating content at scale (for marketers, SEO specialists, or content teams) where consistency and keyword use matter.
The prompt
Act as an accessibility-focused SEO copywriter. Write alt text for images in an article about [TOPIC]. Each description should be ≤ 125 characters, include the primary keyword [PRIMARY_KEYWORD] naturally, and accurately describe what is visually present in the image. Audience: screen reader users and search engines. Generate [N] options per image. For each option, include a character count. Add a self-check: if the alt text could apply to multiple unrelated images, rewrite it to be specific and contextual. Avoid phrases like ‘image of’ or ‘picture of.
Variables to replace:
Real-life example of how to use this prompt
To start, let's assume I'm a content lead at Nvidia. The prompt in the context of Nvidia would look like:
As you can see, I added the main keyword "Nvidia" and specified the intent as well.
Example output from ChatGPT for this prompt
And here's the output:
Option 1:
Nvidia CEO Jensen Huang presenting new AI graphics breakthroughs at GTC 2025 keynote.
(113 characters)
Option 2:
Jensen Huang discusses Nvidia’s next-gen GPU innovations on stage at GTC 2025.
(102 characters)
Option 3:
Nvidia CEO unveils cutting-edge GPU and AI roadmap during his GTC 2025 presentation.
(109 characters)
✅ Self-check:
Each description specifies the event (GTC 2025), role (CEO Jensen Huang), and context (AI/GPU presentation) — making them unique and non-generic.
The primary keyword “Nvidia” is included naturally.
None could apply to unrelated tech presentations.
Or to be more specific:
Pro tips
Replace variables [TOPIC], [PRIMARY_KEYWORD], and [N] with specific, narrow terms (e.g., “AI chip design” instead of “technology”) to keep context tight.
Provide brief image descriptions or filenames in your input so ChatGPT can generate precise alt text that actually matches visuals.
After generation, review the “self-check” section — it helps spot vague or duplicate alt text before publishing.
Use this in batches (e.g., 5–10 images at once) to maintain consistent tone, keyword use, and readability across an entire article or gallery.
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