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Alt-Text Optimizer Pro

Configuration

All settings at a glance: API, image analysis and alt text rules.

You'll find the settings in the administration under Extensions → My extensions → Alt-Text Optimizer Pro → … → Configuration. They are split into three clear sections.

Good news: for most shops the default values already work very well. You can get started right away and don't need to change anything here – apart from the OpenAI key you added in the previous step.

1. API configuration

This is where you decide which AI is used, and with which key.

SettingWhat it meansDefault
AI modelThe OpenAI model that describes your images. GPT-4o mini is cheap and fast – the recommended choice.GPT-4o mini
OpenAI API tokenYour key from platform.openai.com. Required – nothing works without it.–
Plugin configuration: sales channel selection along with the API configuration showing the AI model and the OpenAI API token.
The API configuration: pick a model and store your OpenAI key. The sales channel can be switched at the top.

2. Image analysis settings

These settings determine how closely the AI looks – and therefore how much the analysis costs.

SettingWhat it meansDefault
Image resolutionLow is fast and cheap and is plenty for most product images. High picks up more detail (small text, for instance) but costs more. Automatic lets the AI decide.Low
Maximum response length (tokens)A technical upper limit for the AI's answer. One "token" is roughly 4 characters. The default is comfortably enough for an alt text.150
Default languageWhich language the alt texts are written in: German, English, French, Spanish, Italian or Dutch.German

How is the language determined?

The plugin works through this in order:

  1. If you set a default language here, that one is used.
  2. If none is set, the plugin takes the language of the shop context.
  3. If that doesn't work either, German is the fallback.

3. Alt text settings

Here you decide how long the finished texts may be.

SettingWhat it meansDefault
Minimum number of charactersLower bound. If a result comes out shorter, it is discarded and you get a message.20
Maximum number of charactersUpper bound. Longer texts are trimmed cleanly. Proven for SEO: 80–125 characters.125
Include product nameWhen enabled, the product name and description feed in as context – which makes the texts for product images more accurate.enabled
Further settings: image resolution, maximum response length, default language as well as minimum and maximum length and the “include product name” toggle.
Image analysis and alt text settings: resolution, length, language and whether the product context feeds in.

If a text exceeds the maximum length, the plugin trims it automatically and appends "…". If it is shorter than the minimum length, it is discarded – in that case lower the minimum length or raise the response length (tokens).

What we recommend to start with

For most shops this combination is a good starting point – and it is already preconfigured:

  • Model: GPT-4o mini
  • Image resolution: Low
  • Default language: German (or the language of your shop)
  • Min./max. length: 20 / 125 characters
  • Include product name: enabled

That gives you meaningful, SEO-friendly alt texts at minimal cost. How to generate them is covered in the next chapter: Generating alt texts.

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