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What is Spreadsheet Editor?

Free online spreadsheet editor with 400+ formula functions, cell formatting, drag-fill, freeze panes, and multiple sheets. Upload Excel XLSX/XLS or CSV and download — runs entirely in your browser. A free online tool that works instantly in any browser. TekPulse's Spreadsheet Editor is completely free — no signup, no ads in results, and no data stored on our servers.

How to Use Spreadsheet Editor Online

  1. Upload an Excel (.xlsx) or CSV file, or start with a blank spreadsheet
  2. Click any cell to edit its content directly
  3. Use the toolbar for formatting: bold, font colour, cell background, alignment
  4. Add or delete rows and columns using right-click context menu
  5. Download your spreadsheet as .xlsx (Excel) or .csv format

Why Use TekPulse Spreadsheet Editor?

Runs Entirely in Your Browser
Built on the open-source Luckysheet engine — your spreadsheet data is never uploaded
Import Excel & CSV
Open existing .xlsx, .xls or .csv files and continue editing them
Formulas, Formatting & Multiple Sheets
400+ formula functions, cell formatting, drag-fill, freeze panes, and multi-sheet support
Export to .xlsx
Download as a real Excel file with formulas preserved and re-evaluable in Excel

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Frequently Asked Questions

No — parsing and editing happen entirely in your browser using SheetJS (community edition, Apache 2.0). Your file never leaves your device.

You can upload XLS, XLSX, and CSV files. The output is always downloaded as XLSX (Excel format).

Yes — if your file has multiple sheets, tab buttons appear at the top of the editor. Click a tab to switch and edit that sheet.

Formulas are shown as their calculated values (e.g. a cell with =SUM(A1:A3) shows the sum). When you re-download, cells are saved as literal values. Formula-preserving round-trips are not supported in the free client-side version.

The editor renders up to 500 rows × 50 columns for performance. Files larger than this can still be uploaded — the first 500 rows are shown. All data is preserved on download.

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