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AI alt-text with Vision

What it is

AISA writes the alt-text for your images with AI. With Vision turned on, the AI actually looks at the image and describes what is shown; with Vision off, it infers the alt-text only from context (filename, title, caption, parent page). Vision needs a vision-capable provider: Claude, GPT (OpenAI) or Gemini — DeepSeek and Mistral have no Vision model and always fall back to context. Alt-text is capped around 125 characters, descriptive, with no "image of" filler, and written in the language detected from the caption/title (or the site language).

Where to find it

Turn Vision on in AISA → Settings → API Keys → Images & Vision ("Vision active — the AI analyzes the image"). Generate alt-text from AISA → 1-Click SEO (tick "Images (alt-text)") or from the Images tab in Bulk SEO.

Requirements & tier

Requires at least one vision-capable provider configured (Claude / GPT / Gemini) in BYO-key mode, or Cloud credits. DeepSeek/Mistral only run the context fallback. Estimated Vision cost is roughly €0.0001–0.004 per image.

How to use

  1. Open Settings → API Keys → Images & Vision and pick the dedicated image provider.
  2. Make sure "Vision active" is checked.
  3. Open the Images tab in Bulk SEO, or run 1-Click SEO with "Images (alt-text)" ticked.
  4. Review the estimate, then start; the AI sees each image and returns alt + title.
  5. The alt-text is saved on the attachment (and, in the content, on the matching <img> tags).

Questions people ask

  • Does DeepSeek support Vision? No — neither does Mistral. They use the context-only fallback.
  • What language is the alt-text written in? The one detected from the title/caption, falling back to the page language and then the site locale.
  • How long is the alt-text? Up to about 125 characters, descriptive, no "image of".
  • What if Vision fails on an image? AISA automatically falls back to the context-based prompt for that image.
  • Which images are sent? A resized version (large/medium) under 5 MB, to keep payload and cost down.

Troubleshooting

If alt-text comes out generic, your provider may not be vision-capable — check the Images & Vision box and switch to Claude/GPT/Gemini. If nothing generates, confirm the provider key passes "Test connection" and that the image file is readable and under 5 MB.

Related

AI image titles · Alt-text for images inside the content (builders) · Product Image SEO Template.

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