XLSX and CSV Viewer Online - Open Spreadsheets Locally
Open XLSX worksheets or CSV tables locally, switch between sheets and inspect up to the first 500 displayed rows.
About this tool
The spreadsheet parser reads workbook cell values or CSV rows in the browser and renders them in a scrollable table without uploading business data.
How to use
- Enter the requested details or choose the supported files.
- Run the tool with the intended options.
- Review the preview or downloaded result before use.
Features
- XLSX worksheet tabs.
- CSV table support.
- First 500 rows displayed for performance.
Common use cases
- Inspect a spreadsheet without desktop software.
- Check a CSV export.
- Review workbook sheets on a shared device.
Common issues and tips
- Formulas are shown through stored cell values and are not recalculated.
- Charts, macros, styling and rows after the first 500 are not represented in the preview.
Privacy
All content and files are processed locally in your browser and are not uploaded to Tools12345.
Frequently asked questions
Are formulas recalculated?
No.
Can multiple XLSX sheets be opened?
Yes.
Why are only 500 rows shown?
The preview is capped for browser performance.