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§ · free tool
Mini spreadsheet. Formulas that just work.
A real spreadsheet with a working formula engine — type =SUM(B2:B5) and it computes instantly. 26 columns, 50 rows, CSV import/export and autosave, entirely in your browser. Nothing is uploaded.
A free online tool by Digital Heroes
Click a cell, then type. Formulas start with =
↑↓←→ move · Enter ↓ · Tab → · Del clears
Saved only in this browser — nothing is 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!. Drag a CSV onto the grid to import it, and export the computed values back out any time.
SUMAVERAGE / AVGMINMAXCOUNTCOUNTA
IFROUNDABSSQRTPOWERMOD
CONCATLENUPPERLOWERTODAYNOW
§ 02 · what you can do
Everything a sheet should do.
- Write formulas with =SUM, =AVERAGE, =IF, =ROUND, =CONCAT and 13 more built-in functions — errors like #DIV/0! and #CIRC! are flagged in place.
- Reference cells and ranges with standard notation like A1 or B2:B10, and combine them in expressions like =A1*B2+C3 or =IF(C3>100,"High","Low").
- Edit like a real spreadsheet — arrow keys to move, type to overwrite, Enter or F2 to edit in place, Tab to move right, Delete to clear.
- Import a CSV by clicking Import CSV or dragging a file straight onto the grid (quoted fields and CRLF handled).
- Export computed values to a CSV trimmed to your used range, or copy the whole sheet to the clipboard in one click.
- Auto-save with no account — your sheet writes to this browser as you type and reloads exactly as you left it, even across tabs.
§ 03 · how to use it
Four steps, no manual.
- Open the sheet — it loads instantly with no signup, and your last session is restored automatically.
- Click any cell and start typing a value, or a formula beginning with =, for example =SUM(B2:B10) or =IF(C3>100,"High","Low").
- Press Enter to confirm and move down, Tab to move right, or the arrow keys to navigate. Double-click (or press F2) to edit a cell in place, and use the formula bar for longer edits.
- To bring in existing data, click Import CSV or drag a .csv file onto the grid. To save results, click Export CSV or Copy.
§ 04 · faq
Frequently asked questions.
Is the spreadsheet free?
Yes — completely free for everyone. No sign-up, no account and no usage limits.
Is it private? Is my data uploaded anywhere?
No upload, ever. The whole spreadsheet — grid, formula engine, CSV import and export — runs in your browser on your own device, so your numbers never leave your computer.
Which formulas and functions are supported?
SUM, AVERAGE, MIN, MAX, COUNT, COUNTA, IF, ROUND, ABS, SQRT, POWER, MOD, CONCAT, LEN, UPPER, LOWER, TODAY and NOW — plus cell references, ranges, comparisons, and arithmetic operators including ^ for exponentiation, a trailing % for percentages and & for text joining.
Will I lose my sheet if I close the tab?
No — every change is saved to this browser automatically and reloads when you come back. Clearing site data removes it, so use Export CSV for a backup you control.
Does it work offline?
Yes — once the page has loaded, typing, formulas, CSV import and export all keep working without a connection, because every calculation runs locally.
How big can the sheet be?
26 columns (A–Z) by 50 rows. CSV imports larger than that are clipped to fit and you'll see a note when that happens; imported files can be up to 10 MB.
Published · Last updated .
