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Windows Search keeps a local index—a catalog of file names, properties, and, when enabled for supported formats, document text—so it can find matching files without starting from scratch for every search. The index updates in the background. Its scope is adjustable: Classic mode covers common folders, while Enhanced mode covers the whole PC and may use more resources.
What Windows Search indexing does
Indexing catalogs information about files and other content on your PC. By default, Windows indexes file properties such as names and full paths. For supported text-bearing file types, it can also index file contents, which lets you search for words inside a document rather than only its name.
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Indexing is ongoing, not a one-time scan. Microsoft says an initial build can take up to a couple of hours; afterward, Windows monitors changes and updates the catalog in the background. Apps can contribute too: Microsoft gives Outlook as an example of an app that adds locally synced email to the index for offline search. File Explorer, Edge, and Outlook use the index in different ways. See Microsoft Support’s Search indexing in Windows.
What gets indexed: Classic, Enhanced, and file contents
In Windows 11, find the main controls at Settings > Privacy & security > Searching Windows. Classic mode indexes Documents, Pictures, Music, and the desktop by default. Enhanced mode indexes the whole PC, including user folders and files. You can customize indexed locations and exclude folders. Windows 10 uses Settings > Search > Searching Windows according to Microsoft’s privacy guidance; labels may differ by release.
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| Choice | Coverage or behavior | Search inside supported files? | Resource consideration |
|---|---|---|---|
| Classic | Common folders, including Documents, Pictures, Music, and desktop by default; locations can be customized. | Depends on each file type’s indexing setting. | Microsoft describes it as a balance between coverage and resource use. |
| Enhanced | Whole PC, including user folders and files. | Depends on each file type’s indexing setting. | More comprehensive coverage may use more resources; Microsoft warns it may affect battery life and CPU consumption. |
| Properties only | Indexes properties such as file name and path for the selected file type. | No; finds the file by its properties, not words in its contents. | Less content is indexed than with full-text indexing. |
| Properties and content | Indexes properties and text inside supported files of the selected type. | Yes, for supported text-bearing formats. | More information is included in the index; Microsoft does not provide a universal performance figure for this setting. |
To control whether a file type includes its contents, open Settings > Privacy & security > Searching Windows > Advanced indexing options, then use the file-type options in the Indexing Options window. Exact labels can vary by Windows release. Microsoft’s indexing guidance explains the distinction between properties-only and properties-and-content indexing.
What the local index means for privacy—and what it does not
Microsoft says the index is stored locally on the device. For Copilot+ PCs, Microsoft says semantic-index data is stored locally and is not stored by Microsoft or used to train AI models. Those statements concern the indexing data Microsoft describes; they do not mean every taskbar search feature is offline.
Windows Search can also show results from a personal Microsoft account, a work or school account, and the internet. When enabled, work or school cloud search can include content from OneDrive for Business, Outlook, SharePoint, and other Microsoft Search sources. Web results and suggestions are Bing-powered. These connected results are separate from the local catalog of device files.
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Search history is another distinct privacy setting. Windows stores device search history locally for personalization; users can clear it under Settings > Privacy & security > Search permissions. Cloud web-search history associated with a Microsoft account has a separate control in Microsoft’s privacy dashboard. Microsoft says that when a person searches Bing, it collects search terms and other information, including IP address, location, cookie identifiers, search time and date, and browser configuration. That Bing collection is not the same thing as the local index of document contents. See Windows Search and Privacy and How Microsoft stores and maintains your search history.
How indexing can affect performance and storage
Windows builds and maintains the index in the background, so activity can continue when you are not searching. The initial build may take up to a couple of hours, according to Microsoft; ongoing updates follow changes to indexed content. A PC doing its first build or processing many changes may therefore be in a different state from one with an established index.
Microsoft Support states: “Searching your entire PC may affect battery life and CPU consumption.” This is vendor guidance, not an independent benchmark: Microsoft does not give a universal measured impact for every computer in the cited guidance. The actual effect depends on the device and what it is indexing, so the statement should not be read as a guaranteed amount of battery drain or slowdown.
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The index also uses storage. Microsoft Support’s undated FAQ gives a rule of thumb that it is less than 10 percent of the size of the indexed files, while noting that many very small files or code can raise the share. Treat this as general guidance, not a guaranteed cap for every PC. See Microsoft’s indexing FAQ.
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Copilot+ PCs add semantic indexing alongside traditional indexing for specified document and image formats. Rather than relying only on exact words, semantic search can find related concepts—for example, Microsoft says a search for “lasagna” can return pasta-related results. The support page says semantic indexing is enabled by default on Copilot+ PCs and recommends plugging in the PC for its initial indexing. Supported formats and language support apply to this improved semantic feature; traditional indexing continues to work for supported Windows language packs. These capabilities should not be assumed on other Windows PCs.
Quick Recap
Choose settings for your needs
- For broad discovery: Use Enhanced if you want search to cover files beyond the default common folders, and decide whether searching within supported documents is useful.
- For a battery-constrained or resource-sensitive PC: Keep the indexed locations narrow, exclude folders you rarely search, or use properties-only indexing for file types where searching inside content is unnecessary.
- When performance changes: Check whether the initial build is still underway and review indexed locations before attributing CPU or battery use to Search. Disabling the service by default is a blunt fix: it reduces searchable coverage and can affect apps that use the index.
- For privacy review: Check local indexing scope, device search history, connected work or personal account results, and Bing web search as separate controls rather than treating them as one setting.
- On a Copilot+ PC: Review semantic indexing separately, including supported formats and its initial-build requirements.
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