Why backlink indexing rates vary

The core reason

An indexer can make Googlebot visit a URL. It cannot make Google keep the page. Indexing is a per-page quality and eligibility decision, so the share of submitted URLs that end up indexed depends heavily on what was submitted. Two honest tests of the same tool can report different rates simply because their URL sets differ.

IndexChex's weekly measurements on recurring URL sets put standard-mode indexation at 85%+ for typical sites, links and citations, as of October 2026. The word "typical" carries weight there: the figure describes a mix of ordinary pages, not a worst case. The weekly benchmark presents it with that scope.

Page-level factors

• Content value. Short, templated or spun pages are often crawled and then left out. Profile pages, bare directory listings and auto-generated comment pages are common examples among backlinks.
• Duplication. When a page closely matches another URL, Google chooses one canonical and may index only that version. Syndicated press releases are a frequent case.
• Rendering. If the main content or the link only appears after JavaScript runs, the page may be evaluated differently than its HTML suggests.
• Accessibility. Pages behind logins, consent walls or bot challenges may return little or nothing to Googlebot.

Site-level factors

• Host quality and history. Pages on sites that Google already crawls often and indexes widely tend to be taken up more readily than pages on new or neglected domains.
• Crawl capacity. Slow or error-prone servers limit how much Googlebot fetches, which is the idea behind crawl budget.
• Site structure. A page with no internal links from indexed pages relies entirely on external discovery.

Directives that block indexing

Some URLs cannot be indexed at all, no matter how they are submitted:

A URL set that includes such pages will show a lower rate. Whether to exclude them before calculating a rate is a measurement choice, and it should be disclosed.

Submission factors

Submission mode matters. IndexChex's instant mode and standard mode report different averages because they are designed for different uptake speeds; see standard-mode rate and instant-mode rate. Drip-fed jobs spread crawls over days, so a rate measured at a fixed point after submission will be lower for a drip job than for the same URLs sent at once.

Measurement factors

This is the group most often overlooked when two published rates are compared.

Window

A rate measured at 24 hours and one measured at 7 days describe different things. Most uptake for standard jobs occurs 24 to 48 hours after the crawl (see the indexing timeline), so a short window understates a rate that is still rising.

Denominator

Dividing by all submitted URLs gives a lower figure than dividing by URLs that were reachable, or by URLs that were crawled. Each is legitimate if labelled. Indexing metrics defined names each variant.

Checker accuracy

Every rate is filtered through an index check. IndexChex reports its checker as about 96% accurate in its weekly measurements (October 2026), which means individual results can be wrong in either direction. A checker that misses indexed URLs lowers the rate; one that counts lookalike results raises it. The checker accuracy benchmark covers this.

Set composition over time

A recurring URL set ages. Pages get deleted, sites go offline and content changes. If a test reuses URLs, it should track how many have disappeared, or the rate will drift for reasons unrelated to the tool.

What this means for comparisons

Because so many factors sit outside the tool, a single rate from one vendor and a single rate from another are rarely comparable. The guide to reading indexing claims turns these factors into a checklist, and IndexChex's methodology page states which of them apply to the figures published here by IndexChex.