Convert Filenames to Uppercase

Convert filenames to uppercase letters for archival or legacy mainframe naming standards.

How It Works & Processing Standards

Convert filenames to uppercase letters for archival or legacy mainframe naming standards.

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

Convert Filenames to Uppercase 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 Convert Filenames to Uppercase

  1. 1
    Upload FilesSelect files to uppercase.
  2. 2
    Choose Extension SettingOptionally include file extension in uppercase.
  3. 3
    DownloadSave all uppercase files.

Common Use Cases

  • Conforming to legacy 8.3 filename conventions and CD-ROM ISO 9660 requirements
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