Replace Spaces with Underscores in Filenames

Convert all spaces in filenames into underscores (_) for programming and script compatibility.

How It Works & Processing Standards

Convert all spaces in filenames into underscores (_) for programming and script compatibility.

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

Replace Spaces with Underscores in Filenames 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 Replace Spaces with Underscores in Filenames

  1. 1
    Select FilesUpload files with spaced names.
  2. 2
    ConvertSpaces convert to underscores.
  3. 3
    DownloadSave your renamed files.

Common Use Cases

  • Standardizing dataset filenames for automated Python scripts and bash processing
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