Why index backlinks?

Backlink indexing is necessary so that search engines can actually "see" the donor page and register the link it contains. Until a page is discovered and indexed, a link from it may technically exist, but it won't be included in the calculation of link signals for ranking in systems like Google and Yandex.

From an SEO perspective, this means a simple thing: an unindexed source page conveys little or no value. The search engine robot has either not yet reached it, or it has crawled it but not included it in the index. In both cases, the link is effectively "inactive" for ranking algorithms.

This is why backlink indexing is considered a separate stage of link building. First, a link is placed, then it's important to ensure its discovery by search engines, and only then can one expect a full SEO effect. Without this step, part of the link profile may remain unaccounted for.

This is especially critical for links placed on pages with low internal visibility: forums, comments, profiles, crowdfunding platforms, web 2.0 sites, small blogs, or pages without strong internal linking. Such URLs may be indexed slowly or even completely missed by crawlers.

Accelerating backlink indexing helps reduce the gap between a link's placement and its actual ranking. The faster a search engine discovers a source page, the sooner the link begins to contribute to the site's authority and influence its rankings.

It's important to understand that indexing alone doesn't guarantee link strength. Search engines evaluate not only the existence of a link but also the quality of the source: its topic, trustworthiness, page structure, the link's context, and the site's overall profile. Therefore, indexing doesn't strengthen a link, but rather includes it in the evaluation process.

The bottom line is simple: if a link isn't indexed, it may not work at all; if it is, it has a chance to influence SEO, but its actual effectiveness still depends on the quality of the source.