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FastAPI · Function

File

FastAPI uses File and UploadFile to receive files in multipart form data. Use bytes for small files or UploadFile for metadata, async methods, and better handling of large files.

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Syntax

File(default=Undefined, *, media_type="multipart/form-data", alias=..., description=..., ...)

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  • UploadFile
  • Form
  • Request Forms and Files
  • python-multipart

Source: Request Files - FastAPI. Checked 2026-11-03.