# IRPCThumbnailsAdmin.ResetThumbnailImages

Location: [gRPC API](https://developer.m-files.com/APIs/gRPC-API/index.md) > [Administration API](https://developer.m-files.com/APIs/gRPC-API/admin/index.md) > [Thumbnail administration](https://developer.m-files.com/APIs/gRPC-API/Reference/MFiles.IRPCThumbnailsAdmin/index.md)

HTML version: https://developer.m-files.com/APIs/gRPC-API/Reference/MFiles.IRPCThumbnailsAdmin/ResetThumbnailImages/

Badges: `Administration API / specialized` `admin` `session` `idempotent`

Discards all thumbnail images stored in the vault.

- **Service:** [Thumbnail administration](https://developer.m-files.com/APIs/gRPC-API/Reference/MFiles.IRPCThumbnailsAdmin/index.md) `MFiles.IRPCThumbnailsAdmin`
- **gRPC method:** `/MFiles.IRPCThumbnailsAdmin/ResetThumbnailImages`
- **HTTP (mf-http-grpc):** `POST /grpc/v1/reset-thumbnail-images`
- **Request:** [`ResetThumbnailImagesRequest`](https://developer.m-files.com/APIs/gRPC-API/Reference/MFiles.IRPCThumbnailsAdmin/ResetThumbnailImages/index.md#request)
- **Response:** [`ResetThumbnailImagesResponse`](https://developer.m-files.com/APIs/gRPC-API/Reference/MFiles.IRPCThumbnailsAdmin/ResetThumbnailImages/index.md#response)
- **Book and level:** Administration API, specialized
- **Kind:** admin
- **Session:** Required: the session ID from LogIn in the mfiles-session-id-bin metadata.
- **Idempotent:** yes
- **Returns metadata structure version:** no
- **Streaming:** none (unary)

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## Remarks

- Deletes the stored thumbnail image of every file in the vault and clears the thumbnail
  information of the files. Files and documents are not changed.
- Requires the vault rights `change_metadata_structure` and `license_allows_modifications`.

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## Request: ResetThumbnailImagesRequest

No fields.

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## Response: ResetThumbnailImagesResponse

No fields.