Why backlink tools show different results

Backlink tools show different results because their reports may describe different collections, dates, filters, and counting units. Before deciding that one total is wrong, ask what each number counts. A referring-domain total and a source-page total cannot be compared as if they describe the same set.

Treat each export as a dated inventory. The backlink discovery overview explains why an inventory is a starting point for research rather than a complete statement about every page on the web.

Compare the report settings first

Write down the target entered into each tool. A report for an exact product URL can differ from one for a folder, a hostname, or an entire domain. Check whether subdomains count and whether redirects change the target being reported.

Then inspect the filters. Live links, historical links, one link per domain, language, link attributes, and minimum vendor scores can all change a visible set. Record the settings beside the export file. A screenshot of the filter panel can be useful, but it should accompany a plain-text description someone can search later.

Vendor products can also impose different collection limits. Semrush's Backlink Audit help page describes a per-domain limit within that product. Read the documentation for the specific report you exported instead of applying one product's limits to every report sold by that company.

Reconcile a small synthetic example

Suppose two fictional exports cover a bakery's catering section. Export A contains 120 rows from 18 source domains. Export B contains 75 rows from 24 source domains. Neither number alone tells you which collection better answers your question.

On inspection, A includes 70 repeated footer links from one event directory. B keeps one row per source page and also includes six small venue sites absent from A. A was downloaded today from records collected across the past month. B was downloaded yesterday, but its rows contain a mixture of observation dates.

If your task is to find new publishers to review, B's additional venue domains may matter. If your task is to inspect every expected footer placement, A may contain source URLs you need. The useful outcome is a reconciled shortlist with provenance, not a declaration that the larger total wins.

Separate rows, pages, hosts, and domains

Choose a counting unit before joining the files. One source page can contain several links to the same target. Several pages can share a hostname. Several hostnames can sit under one registrable domain.

In your comparison sheet, keep the raw rows and add derived columns for source URL, source host, target URL, and the grouping rule. Count each view separately. Do not delete repeated rows before checking whether they preserve different anchors, targets, or observation dates.

A useful first reconciliation table has four sets: rows shared by both exports, only in A, only in B, and unresolved matches. The unresolved set might include redirected URLs or different tracking parameters. Resolve these deliberately instead of forcing an exact match.

Ask what the crawler could inspect

Collection dates matter because pages change. Access also matters: a crawler may fail to retrieve a page that your browser opens, or may inspect a different response. That does not make the browser observation useless; it means the observations need their own context.

Review the niche crawl worksheet when either tool reports bounded coverage. A precise denominator, such as inspected URLs from a seed list, is more informative than a vague claim of broad coverage.

Keep inaccessible rows in an unresolved group. Their absence from an export cannot prove that a link disappeared. A current successful inspection can answer a narrower question about the exact source page checked.

Use disagreement to choose checks

Do not manually inspect every difference with equal urgency. Start with pages tied to existing placement expectations, then review candidates with a clear audience fit. A missing historical directory row may deserve less attention than a newly discovered trade association resource page.

Our candidate evaluation guide helps turn the differences into review tasks. If the goal is new research, return to the opportunity shortlist process after reconciling the files.

Save your chosen rules with the result: target scope, filters, grouping, dates, and unresolved cases. Another person should be able to run the same comparison next week without guessing what you meant by “backlinks.” That repeatability matters more than making two vendor totals agree.

Sources

1. Why didn't Backlink Audit fetch all my backlinks and referring domains? · Semrush · Not stated; accessed September 12, 2026