# Sheets

> Spreadsheets as a data source: import, edit, calculate, format and bind.

Glider documentation · Data · Web page: https://cgglider.com/docs/sheets/

Sections of this page: [Import](https://cgglider.com/docs/sheets.md) · [The grid](https://cgglider.com/docs/sheets/grid.md) · [Formulas](https://cgglider.com/docs/sheets/formulas.md) · [Formatting](https://cgglider.com/docs/sheets/formatting.md) · [Binding cells](https://cgglider.com/docs/sheets/binding.md) · [Live outputs](https://cgglider.com/docs/sheets/feed.md)

Bringing in .xlsx, .xls and .csv.

Upload .xlsx / .csv adds a workbook to the page. Every tab is parsed into a grid that travels inside the page JSON, so the runtime and the agent reports never need a spreadsheet parser — parsing happens once, in the browser, at upload time.

| Limit | Value |
| --- | --- |
| Accepted | .xlsx, .xls, .csv |
| Max rows | 5000 |
| Max columns | 256 |
| A blank sheet | 20 rows × 8 columns |

## Replacing the file

Replace file swaps the parsed tabs but keeps the sheet's id, name, overrides and bound cells, so existing bindings survive a new drop of the same report. A reference whose cell or tab is missing from the new file becomes dangling: projected as absent and surfaced as a warning rather than silently dropped.

## Formulas in the file

A workbook's formulas stay live when every function they call is supported (see Formulas); otherwise the cell keeps the value the file last calculated. A CSV cell that starts with = is read as a formula too.

![An imported workbook.](https://cgglider.com/docs-shots/sheets-import.png)