Check File Extension & Base Name

Separate filenames into their base name (stem) and extension parts across batch files.

How It Works & Processing Standards

Separate filenames into their base name (stem) and extension parts across batch files.

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

Check File Extension & Base Name 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 Check File Extension & Base Name

  1. 1
    Upload FilesChoose files to analyze.
  2. 2
    View ExtensionsReview filename, stem, and extension breakdowns in a table.

Common Use Cases

  • Auditing batch files to verify correct file extensions before system ingestion
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