Hi Product Hunt — I built Charttoolbox after noticing a gap between spreadsheet charts and full BI tools. For a small CSV, I often wanted three things: a clear recommendation about the expected data shape, a way to correct automatic field detection, and an export I could continue editing. The first version focused only on heatmaps. User workflow questions led me to add two separate tools rather than one generic chart picker: pie/donut for genuine part-to-whole data, and bar charts for category or multi-series comparison. I intentionally left out accounts, cloud storage, collaboration, and AI features. The current product is a focused browser utility: open or paste data, verify the mapping, customize, and export. I would love feedback from people who work with CSV or Excel: which step still feels unclear, and what kind of small chart task is not covered well? The demo data is fictional. ## Feature list - Heatmap, Pie/Donut, and Bar Chart workflows - CSV, TSV, XLS, XLSX, and pasted table input - Visible and editable field mapping - Clear validation instead of silent data repair - Vertical, horizontal, and grouped bars - PNG at multiple scales and editable SVG export - Local spreadsheet-content processing - No account required ## FAQ **Does Charttoolbox upload my spreadsheet?** Spreadsheet contents are parsed and rendered in the browser and are not uploaded for server-side chart creation. Optional GA4 analytics loads only after consent and is not intended to receive file names, cell values, pasted data, or generated chart data. **Which chart should I choose?** Use a heatmap for patterns across two dimensions, pie/donut for a small part-to-whole dataset, and bars for category or multi-series comparison. **Can I edit the detected fields?** Yes. Heatmap interpretation and pie/bar category-value mappings remain visible and editable. **What does it export?** PNG for sharing and SVG for further editing. **Is this a BI dashboard?** No. It is intentionally designed for quick, one-off chart creation.

Charttoolbox

Turn spreadsheet data into clear charts in your browser

Turn spreadsheet data into clear charts in your browser