Link Donor

A link donor is an external website that places a backlink to the promoted resource. The donor's quality directly determines whether the link will drive rankings up — or hurt them.

• •Donor evaluation criteria (30+ factors, key ones):
• •Topical relevance: the site should belong to the same or an adjacent niche as the target.
• •Domain Rating / Trust Flow: composite authority metrics from Ahrefs (DR 30+) and Majestic (TF 20+).
• •Organic traffic: real search visitors — minimum 500–1,000/mo per Ahrefs / SimilarWeb.
• •Spam score: SEMrush Toxic Score, Serpstat — low values (< 20%).
• •Domain history: Wayback Machine — no sudden topic switches, penalties, or drop-catch signals.
• •The donor's own backlink profile: authority should flow through a clean pyramid.
• •Outbound-to-inbound ratio: the site shouldn't link to 500 external resources while having only 20 incoming links.
• •Google / Bing indexation: an unindexed donor passes no equity.
• •Domain age: young domains (< 6 months) pass less link equity.
• •Regional match (.com for global, .co.uk for UK targets, etc.).

• •Donor types:
• •Topical blogs — the gold standard, maximum equity when the topic is a precise match.
• •Industry publications and portals — high trust, but usually nofollow.
• •Directories and catalogs — low weight, but useful bulk for a natural profile.
• •Forums and discussion threads — appropriate for crowd marketing, generally nofollow.
• •PBN sites — controlled donors (see separate term).

A bad donor can cause damage: one link from a spam site in isolation is negligible, but 30 such links in a month is a signal to Google's Penguin / Link Spam Update and sufficient to trigger a manual or algorithmic penalty.

Donor selection is a critical part of an SEO agency's work. Manual review of a single candidate takes 20–40 minutes; inside a retainer this is one of the most underrated but most labor-intensive tasks.