Installation & configuration - AltTextLab

Basic installation

Copy the snippet from your Web Snippets dashboard and paste it before </head>. If you haven’t created a snippet yet, see Get started.

<script src="https://cdn.alttextlab.com/embed.js"
  data-site-id="your_site_id"
  data-public-key="your_public_key"
  data-lang="en"
  data-style="neutral"
  defer
></script>

Google Tag Manager

If you don’t have direct access to the HTML source, deploy via GTM. Option 1 — Custom HTML tag

In GTM, create a new Custom HTML tag
Paste the <script> tag as the tag content
Set the trigger to All Pages
Publish the container

Option 2 — GTM Template Gallery Use the official AltTextLab template from the GTM Template Gallery. The template includes all parameters as configurable fields — no manual script editing required.

Parameters

Parameter	Required	Default	Description
`data-site-id`	Yes	—	Auto-generated site ID. Do not change.
`data-public-key`	Yes	—	Auto-generated public key. Do not change.
`data-lang`	Yes	—	Language code for generated alt text (e.g. `en`, `de`). See supported languages.
`data-style`	Yes	—	Writing style: `neutral`, `descriptive`, `matter-of-fact`, or `minimal`. See Writing styles.
`data-min-natural-size`	No	`0`	Minimum image dimension in pixels. Images smaller than this value are skipped. Default `0` processes all images.
`data-delay`	No	`0`	Delay in milliseconds before the snippet starts scanning.