Why this tool is useful
Open a downloaded report, tabular export or unfamiliar workbook for a quick read-only inspection without sending business or personal data to a server.
Local File Tools · runs locally
Private Spreadsheet Viewer
Preview an XLSX, CSV or TSV spreadsheet locally with bounded rows and columns, without uploading data or evaluating formula-like cells.
Ready. Your working data stays in this browser.
Files and capture streams stay on this device. Processing uses browser APIs only; nothing is uploaded to YTSave, the media API or a proxy.
How it works
The browser routes XLSX files through a bounded ZIP reader and parses CSV or TSV with quote-aware delimiters. Formula and formula-like cells remain plain text or cached values and are never evaluated; external data is never requested.
Practical example
Choose an XLSX sales report or a quoted CSV export, check up to 100 rows and 50 columns, and confirm whether formula-like cells appear before using the file.
Validation
The calculation is deterministic and explains validation errors instead of silently changing invalid input.
Privacy boundary
Input and output remain in this tab. Copy and download happen through browser APIs without a server upload.
Result passport
Every run reports its tool mode, timestamp and input/output size so transformed data can be audited.