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FastAPI · Class

UploadFile

UploadFile represents a received file in a FastAPI multipart form request. It provides file metadata and async methods while avoiding the need to keep large files entirely in memory.

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Syntax

UploadFile(file: BinaryIO, *, size: int | None = None, filename: str | None = None, headers: Headers | None = None) -> None

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  • File
  • Form
  • Request Files
  • SpooledTemporaryFile
  • content_type
  • read
  • write
  • seek

Source: UploadFile class - FastAPI. Checked 2026-11-03.