Local · Private · Free

Mini Spreadsheet

A real spreadsheet with a working formula engine. Type =SUM(B2:B5) and it just works, entirely on your device. No upload, no account.

A1 fx Formula or value for the active cell

Click a cell, then type. Formulas start with = ↑↓←→ move · Enter ↓ · Tab → · Del clears

Your sheet is saved only in this browser (localStorage), nothing is ever uploaded.

A spreadsheet that runs on your machine

Reference cells like A1, ranges like A1:B5, and combine them with + − * / ^ %. The formulas are parsed by a real tokenizer and recursive‑descent evaluator (no eval()), dependents recalculate automatically, and circular references are caught and flagged #CIRC!.

SUMAVERAGE / AVGMINMAXCOUNTCOUNTA IFROUNDABSSQRTPOWERMOD CONCATLENUPPERLOWERTODAYNOW

About Mini Spreadsheet

Mini Spreadsheet is a free, private tool by Digital Heroes that runs entirely in your web browser. It gives you a full formula engine with support for functions like =SUM, =IF, =AVERAGE and cell references like =A1*B2. Everything runs locally on your device: your data is never uploaded to a server, no sign-up is required, and the tool keeps working offline. You can import and export data as CSV, and your sheet saves automatically to your browser. It is 100% free with no usage limits.

What you can do

Write formulas using =SUM, =AVERAGE, =IF, =ROUND, =CONCAT and 14 more built-in functions.

Reference cells and ranges with standard notation like A1, B2:B10, or combine them in expressions like =A1*B2+C3.

Import a CSV file by clicking "Import CSV" or dragging a file onto the grid.

Export computed values to a CSV file with one click, trimmed to your used data range.

Auto-save your work in the browser with no account. Your sheet reloads exactly as you left it.

Load an example sheet to see formulas, ranges, and IF logic working together instantly.

How to use Mini Spreadsheet

Open Mini Spreadsheet. It loads instantly with no signup and your last sheet is restored automatically.

Click any cell and start typing a value or a formula. Formulas start with =, for example =SUM(B2:B10) or =IF(C3>100,"High","Low").

Press Enter to confirm and move down, Tab to move right, or use the arrow keys to navigate. Double-click a cell to edit it in place.

To import existing data, click Import CSV or drag a .csv file onto the grid. To save your results, click Export CSV.

Frequently asked questions

Is Mini Spreadsheet free?

Yes. Mini Spreadsheet is completely free for everyone. No sign-up, no account, and no usage limits.

Is it private? Are my files uploaded anywhere?

No. Mini Spreadsheet runs entirely in your browser, so your data never leaves your device and nothing is uploaded to a server.

Does it work offline?

Yes. Once the page has loaded it keeps working offline, and you can install it as an app from your browser.

Do I need to install anything or create an account?

No. Just open the page and start using it. Installing it as an app is optional and only adds offline convenience.

Which formulas and functions are supported?

The formula engine supports SUM, AVERAGE, MIN, MAX, COUNT, COUNTA, IF, ROUND, ABS, SQRT, POWER, MOD, CONCAT, LEN, UPPER, LOWER, TODAY and NOW, plus standard cell references, ranges, and arithmetic operators including ^ for exponentiation and & for text joining.