AltTextLab GTM Template

A tag template for Google Tag Manager (Web) that connects the AltTextLab Web Snippet and automatically generates alt-text for images.

• Loads the AltTextLab Web Snippet from a CDN
• Improves accessibility (WCAG/ADA) and SEO
• Works without changing your website code (via GTM)

Requirements

• Google Tag Manager Web container
• AltTextLab access data:
  • Site ID
  • Public Key

Install in GTM

1. Install the GTM template
2. On https://app.alttextlab.com/web-snippets create a new Web Snippet and copy the provided Site ID and Public Key
3. Publish the tag

Configure the tag

Fill in the fields:

• Site ID - the site identifier in AltTextLab
• Public Key - the project public key
• Language - the generation language (default en)
• Style - text style:
  • descriptive
  • neutral (default)
  • matter-of-fact
  • minimal

Recommended start trigger: All Pages.

Check that it works

1. In GTM enable Preview
2. Open your site and make sure the tag fired
3. In DevTools verify:
   • the presence of window.__alttextlab_config
   • that https://cdn.alttextlab.com/embed.js is loaded

Template permissions

The template uses standard GTM permissions:

• access_globals - access to __alttextlab_config
• inject_script - loads the script from https://cdn.alttextlab.com/embed.js*
• logging - logging in debug environments

Possible issues

• The tag doesn't fire: check the trigger and container publication
• No output: make sure Site ID and Public Key are set correctly

Useful links

• Site: https://www.alttextlab.com/
• Web Snippet documentation: https://www.alttextlab.com/docs/web-snippet