Adding my support to this. I’ve just gone through this issue with Ahrefs support today and they confirmed that it’s not currently possible to exclude specific external image URLs from the “missing alt text” audit.

The problem is that Meta Pixel <noscript><img> URLs are parsed at the HTML stage before any crawl-exclusion or regex filtering is applied, so even adding a pattern like:

facebook\.com/tr

.

…does not remove the warning.

Support confirmed that this behaviour is expected.

For sites like mine (London-based equipment hire, ~200+ pages, SEO-heavy), this creates large volumes of false-positive warnings that cannot be resolved, and it makes the audit harder to use as a decision tool.

A proper solution would be:

Site Audit → Settings → “Exclude these external image URLs or patterns”

Allowing:

Single URL

Partial URL

Whole domain

RE2 regex

Or an allow/deny list (toggles)

This would solve the Meta Pixel issue, Google Ads tracking pixels, LinkedIn Insight tags, DoubleClick, etc., without turning off legitimate external image checks.

Support told me the only current workaround is creating a new view and hiding the issue, which works visually, but doesn’t solve the underlying noise.

This feels like a small feature with a big quality-of-life impact for anyone using tracking tags.