Chart Generator

How to use it

1. Paste data into the left panel. A CSV needs a header row: the first column holds the labels, every other column becomes one series.
2. JSON works too: an array of arrays with a header row, or an array of objects whose first non-numeric key holds the labels.
3. Pick bar, line or pie. The pie uses the first series and labels every slice with its share.
4. Adjust width and height, then click Generate.
5. Download the PNG with Download, or copy the parsed summary with Copy.

Common use cases

• Quick look at an export - paste a CSV slice from a database or spreadsheet and see the shape before writing any code.
• Slides and documents - export a 2x PNG that stays sharp when the slide is projected.
• Checking a data pull - the summary reports min, max and sum per series, so an obviously wrong column shows up at once.
• Teaching the shape of data - switch one dataset between bar, line and pie to show how the same numbers read differently.

Why it stays private

Parsing and drawing happen in the page with the canvas 2D API. There is no charting library, no request to a rendering service and no upload, so unfinished or sensitive figures never leave your browser.

FAQ

Q: What CSV layout does it expect? A: A header row, then rows where the first cell is the label and the remaining cells are numbers. Without a header row it falls back to label plus a single series named Value.

Q: Why does the pie chart only use one series? A: A pie shows parts of one total, so it uses the first series. Negative values are skipped because they have no meaning as a slice of a total.

Q: Can it handle negative values? A: Yes. The axis extends below zero automatically, and bars are drawn downward from the zero line.

Q: How is the exported PNG 2x? A: The canvas is drawn at twice the width and height you set, then scaled down for display, so the downloaded file has twice the pixels in each direction.