Local File Tools
Inspect, verify and transform selected files directly in your browser without uploading their contents or using downloader workers.
Private MP4 Container Inspector
Inspect MP4 brands, top-level box structure and declared track handlers from bounded local file slices without decoding or uploading the media payload.
Open tool →Private AVIF to JPG Converter
Decode a browser-supported AVIF image and create a compact RGB JPEG copy locally, with transparent pixels composited onto white and no source upload.
Open tool →Private AVIF to PNG Converter
Decode a browser-supported AVIF image and export a pixel-preserving PNG copy locally, without uploading the original or retaining its metadata.
Open tool →Private XLSX to CSV Converter
Export the first worksheet of a bounded Excel XLSX workbook to standards-safe CSV locally, without uploading data or executing workbook logic.
Open tool →Private XLSX to JSON Converter
Convert the first worksheet of a bounded Excel XLSX workbook into structured JSON locally, with deterministic headers and no spreadsheet execution or upload.
Open tool →Private XLSX Spreadsheet Viewer
Preview a bounded Excel XLSX worksheet locally without uploading the workbook, executing formulas, macros, external links or embedded content.
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