Spreadsheet Lite — Online Grid with Formulas

Spreadsheet Lite is a genuinely useful online spreadsheet that runs entirely in your browser. It gives you an editable grid, a small but real formula engine (arithmetic plus SUM, AVG, MIN, MAX, COUNT and PRODUCT), and one-click import and export for both CSV and XLSX — with no sign-up, no upload, and no network calls of any kind. It is built for the quick jobs that do not justify opening a full desktop suite: totalling a column of figures, cleaning up an exported CSV, sketching a budget, reshaping a small dataset, or turning a list into an Excel workbook you can hand off.

Because everything is local, it is also a privacy-safe place to work with data you would rather not upload anywhere. Your sheet is saved to this browser between visits, so you can close the tab and come back to exactly where you left off. When you are done, export evaluated values for a clean handoff, or export your raw formulas so the work stays editable.

How it works

You edit the grid like any spreadsheet: click a cell to select it, double-click (or press Enter) to edit, and use the arrow keys to move around. Anything that starts with an = is treated as a formula. The engine parses it, resolves the cells it references, and shows the computed result — recalculating the instant any dependency changes. Cell references use single-letter columns A to Z and 1-based row numbers, and ranges are written as A1:A9. A live status line reports how many cells are filled, how many hold formulas, and the running sum of every numeric cell.

For import, CSV files are parsed with a parser that correctly handles quoted fields and embedded commas, while XLSX workbooks are read locally and the first worksheet is loaded into the grid. For export you get three targets: an .xlsx workbook, a CSV of evaluated values, and a CSV that preserves your raw formulas so you can round-trip the file. Detected problems are surfaced inline — #CIRC! for a circular reference, #ERR! for a bad reference, and #NUM! for a non-finite result such as a divide by zero.

Example

Suppose you paste a small order list: column B holds quantities and column C holds unit prices. In D2 you type =B2*C2 and copy the idea down each row to get line totals. Then in a summary cell you write =SUM(D2:D4) for the grand total and =AVG(C2:C4) for the average unit price. Change any quantity and every dependent total updates immediately.

When the numbers look right, click Export XLSX to download a real Excel workbook, or Export CSV (values) for a plain file. Every calculation happens on your own device — none of your figures ever leave the browser.