# SearchIndexer.exe

Windows Process: Microsoft Corporation

Also called searchindexer, windows search indexer, microsoft windows search indexer

Windows, System Component

Windows Search Indexer. It crawls files so Start and File Explorer can answer without walking the whole disk each time.

## What you need to know

This writes the search index. SearchHost.exe is the search box you type into.

SearchIndexer.exe is the WSearch worker. High disk after an upgrade or a new folder is a rebuild. SearchHost.exe is the UI. They are not the same process.

- **Safe?**: Yes. It builds the index

  **High disk after a copy?**: Often a crawl

  **Same as SearchHost?**: No. SearchHost is the box

Feex says

If the indexer is loud and I just dumped 200 GB onto the PC, I would let it crawl. Disabling WSearch makes every later search walk the disk again.

## What is SearchIndexer.exe?

SearchIndexer.exe is the Windows Search Indexer. It is the process you should expect when WSearch is Automatic. SearchHost.exe draws the search home.

## What does it do?

It enumerates included folders, parses properties, and writes the index catalog. Outlook cached mail can also be in scope on some PCs.

## Why is it running?

Files changed, a location was added, or Windows is rebuilding after a feature update. Idle indexer should settle. Days of 100 percent disk on an SSD needs Indexing Options.

## Is it safe?

Usually safe

The legitimate indexer is in System32. A SearchIndexer.exe in a "speed up search" zip is not WSearch.

A legitimate copy normally runs from:

`C:\Windows\System32\SearchIndexer.exe`

- Expected publisher: Microsoft Corporation
- Service: WSearch
- UI process: SearchHost.exe

## Can I end it?

Search gets slower

Ending the indexer pauses the crawl until WSearch starts it again. It does not permanently shrink the index. Use Indexing Options to drop a huge folder.

## Can I remove it?

No

Do not delete SearchIndexer.exe. Disable WSearch only if you accept unindexed search. That is a service decision.

## Should it start with Windows?

WSearch starts the indexer. It is not Discord in Startup Apps.

## Normal resource behavior

These are contextual labels, not universal averages.

- **CPU**: Rises while parsing new files

  **Memory**: Moderate

  **Disk**: The usual complaint, especially on HDD

  **Network**: If a location is a UNC path

## File information

| Executable name        | SearchIndexer.exe                     |
| ---------------------- | ------------------------------------- |
| Common legitimate path | C:\Windows\System32\SearchIndexer.exe |
| Publisher              | Microsoft Corporation                 |
| Signature expectation  | Signed by Microsoft Windows           |

## Related services

WSearch is the service. SearchHost.exe is the box. This process writes the catalog.

Windows Search Windows Service

## Common problems

### Rebuild after a feature update

Indexing Options shows status. A rebuild is hours on a large HDD. That is expected work.

### Cloud folders

OneDrive files on-demand can make the indexer wake often. Exclude the library as a test before you disable WSearch.

## Troubleshooting

Diagnose before you change anything destructive.

### Indexing Options first

See included locations and pause. Do not delete the catalog folder as a first step.

### Rebuild only after a broken index

A rebuild is a real job. It is not a weekly tune-up.

## Technical details

Technical details

| Image name | SearchIndexer.exe |
| ---------- | ----------------- |
| Service    | WSearch           |

## Related

These entities connect to this article. Type is shown on every link.

[Windows Search: Windows Service](https://feex.it/wiki/service/windows-search)[Windows Search: Windows Service](https://feex.it/wiki/service/windows-search)[SearchHost.exe: Windows Process](https://feex.it/wiki/process/searchhost.exe)[When high CPU is normal: Guide](https://feex.it/wiki/software/system/when-high-cpu-is-normal)

## Sources and verification

Reviewed by Feex editorial. Last verified August 2026 Status: Feex Reviewed. [How we research](https://feex.it/wiki/research).

- [Microsoft Learn: Windows Search ](https://learn.microsoft.com/windows/win32/search/-search-3x-wds-overview)· Indexer and WSearch
- [Microsoft Support: indexing options ](https://support.microsoft.com/windows/search-indexing-in-windows)· Rebuild and locations
- [Foxhole process map ](https://foxhole.feex.it/)· First-party samples on Windows PCs. Not a lab benchmark.

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Quick facts

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- **Type**: Windows Process

  **Publisher**: Microsoft Corporation

  **Executable**: SearchIndexer.exe

  **Typical path**: C:\Windows\System32\SearchIndexer.exe

  **Related service**: WSearch

  **Mapped by Feex**: Seen on Windows PCs in Foxhole

Feex Reviewed: Last verified August 2026

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Source: [Canonical Feex Wiki page](https://feex.it/wiki/process/searchindexer.exe/)

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