Normalize File Extension Case (.JPG → .jpg)

Standardize mismatched uppercase extensions (.JPG, .PNG, .PDF) into clean lowercase extensions.

How It Works & Processing Standards

Standardize mismatched uppercase extensions (.JPG, .PNG, .PDF) into clean lowercase extensions.

Your input data is never sent to any server and is securely processed on your device.

Current Limits

  • Desktop max file size: 100MB
  • Mobile max file size: 40MB

Normalize File Extension Case (.JPG → .jpg) is a 100% free, browser-based online utility. All calculations and file conversions run locally inside your browser (Local-First) without sending data to remote servers, keeping your documents and inputs strictly private.

How to Use Normalize File Extension Case (.JPG → .jpg)

  1. 1
    Select FilesPick files with uppercase extensions like .JPG.
  2. 2
    NormalizeExtensions convert to standard lowercase.
  3. 3
    DownloadSave cleaned files in a ZIP.

Common Use Cases

  • Fixing digital camera photo collections containing .JPG and .MOV uppercase extensions
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