Limits & supported formats
To keep the service stable and fast for everyone, the limits below apply. Operations that exceed a limit are rejected with a clear message.
Processing limits
| Limit | Value |
|---|---|
| Upload size | up to 25 MB |
| Rows | up to 1,000,000 |
| Columns | up to 500 |
| Total cells (rows × columns) | up to 3,000,000 |
| Datasets per workspace | up to 8 |
| Undoable steps per dataset | 20 (older ones are removed automatically) |
| Workspace storage quota | 300 MB |
| Retention | deleted automatically after the period you choose (1, 6, 12, 24, 72, 168 hours), counted from your last activity |
| Operation time | 45 s (SQL: 8 s) |
| SQL result rows | up to 200,000 |
| Upload rate | at most 30 uploads per 10 minutes |
Import formats
| Format | Extensions | Notes |
|---|---|---|
| Delimited text | .csv .tsv .txt .tab | Encoding and delimiter detected automatically; adjustable |
| Excel | .xlsx .xlsm .xls | Multiple sheets; for formulas the stored result is read; password-protected files are not supported |
| OpenDocument | .ods | Multiple sheets |
| JSON | .json | A list of records, an object of column lists, or an object holding one list; nested fields are flattened |
| JSON Lines | .jsonl .ndjson | One record per line |
Export formats
CSV · TSV (tab-separated) · Excel (XLSX) · JSON · JSON Lines · Markdown table · HTML table · SQL (CREATE + INSERT) · Parquet (columnar, compressed) · Feather / Arrow (fast binary) · XML · Stata (.dta) · LaTeX table
Excel (XLSX) output can have at most 1,048,576 rows, 16,384 columns and 32,767 characters per cell; for larger data use CSV or JSON.
Known behaviours
- In merged Excel cells the value is only present in the first cell.
- Timezone-aware dates are converted to UTC and the zone information is dropped.
- Dates are detected automatically in ISO order; day.month.year formats stay as text and are converted with “Convert to date”.