What changed?
Search Engine Land reported on August 14, 2026 that Google Analytics added custom integer lookback windows for advertising conversions. The report describes engaged-view conversion windows from 1 to 30 days, replacing a fixed 3-day window, and click-through conversion windows from 1 to 90 days, replacing preset choices.
The report locates the settings under Advertising > Conversion management > Settings in Google Analytics and in the linked Google Ads conversion-management interface.
Why it matters
The lookback window determines how far back an eligible ad interaction can be considered when conversion credit is assigned. More granular choices allow teams to select a window that better reflects their documented advertising measurement policy and sales-cycle context.
Changing the window can change attributed advertising conversions and credit allocation. It does not change the underlying website action or prove that an ad caused the conversion.
Who is affected
Teams managing eligible click-through and engaged-view advertising conversion measurement in Google Analytics or linked Google Ads settings should review their current windows and reporting definitions.
Measurement impact
This announcement concerns advertising conversion lookback settings. It should not be generalized to every GA4 attribution report, every key event, or all website conversions. Confirm the conversion type and configuration to which a selected window applies.
Comparisons can become misleading if the window changes between periods or differs between systems. Keep the setting and effective date with the reporting definition, and distinguish attributed conversion credit from total conversions.
What to check
Before changing a window, align the setting with the conversion action and measurement question.
- Confirm whether the analysis concerns click-through or engaged-view conversions.
- Review linked Google Analytics and Google Ads settings and note any differences.
- Choose a window based on an explicit business rule, not simply to increase credited conversions.
- Record the previous and new values, effective date, and impacted reports.
- Keep total key-event counts separate from advertising-attributed conversion credit.
Recommended action
Document the conversion type, selected window, and reporting purpose before changing configuration. Annotate the effective date, and avoid interpreting a shift in attributed conversions as a change in demand unless other evidence supports that conclusion.
Original source
This update is based on the original announcement from Search Engine Land. The summary and measurement recommendations above are editorial analysis.