What data format does the chart maker accept?

Any delimited table — comma (CSV), tab (TSV), semicolon or pipe separated. The first column is treated as labels and each remaining numeric column becomes a data series. You can paste straight from a spreadsheet, paste raw CSV text, or upload a .csv file.

How do I export the chart as an image?

Click Download PNG. The chart is re-rendered off-screen at the width and height you set (default 1200x700), so the export is crisp even at large sizes. Use the @2x button for retina-grade output, and toggle a transparent background if you need to drop the chart onto a coloured slide.

Can I make a pie chart from a column of values?

Yes. Switch the chart type to pie or doughnut and the tool plots the first value column, giving every row its own slice and colour from the palette. Bar and line charts plot all numeric columns as separate series so you can compare them side by side.

Is my data uploaded anywhere?

No. Parsing, rendering and PNG export all happen locally in your browser using Chart.js and PapaParse. No data ever leaves your device, which makes it safe for confidential figures. Your last chart is also remembered in this browser via localStorage so you can pick up where you left off.

Why are some values showing as zero or being skipped?

The parser strips currency symbols, percent signs and thousands separators before converting to numbers, but truly non-numeric cells become zero. If an entire column is text it is ignored as a series. Check the row and column counts shown under the input, and confirm the delimiter matches your data.

Can I get the underlying Chart.js configuration?

Yes. Click Copy Chart.js config to copy a ready-to-use JSON configuration object to your clipboard. Drop it into a Chart.js project to reproduce the exact same chart in your own app, dashboard or report.

Chart Maker — Gera Tools

Chart Maker turns a plain table of numbers into a clean, presentation-ready chart in seconds. Paste data straight from a spreadsheet or a CSV file, choose a bar, line, pie or doughnut chart, tune the colours and labels, and export a high-resolution PNG you can drop into a slide deck, report or blog post. It is built for anyone who needs a quick visual — analysts sanity-checking a dataset, founders building a pitch deck, students writing up results, or developers who just want a chart image without wiring up a library.

Everything runs entirely in your browser. The parsing is handled by PapaParse and the rendering by Chart.js, so your numbers never touch a server. That means it works offline, respects confidential figures, and remembers your last chart between visits using localStorage — no account, no upload, no tracking of your data.

How it works

Paste a delimited table into the input. The tool auto-detects whether you used commas, tabs, semicolons or pipes, then treats the first column as the category labels and every remaining numeric column as a separate data series. A bar or line chart plots all of those series together so you can compare them; a pie or doughnut chart visualises the first value column, giving each row its own slice.

Before charting, each cell is cleaned: currency symbols, percent signs and thousands separators are stripped so values like £12,400 or 87% are read as the numbers 12400 and 87. Columns that contain no numbers at all are ignored as series, and the live row and column counts under the input tell you exactly what was understood. From there you control the legend, gridlines, axis origin, stacking, horizontal bars and area fill, recolour every series with a colour picker, and set the export dimensions and background. When you are happy, Download PNG re-renders the chart off-screen at full resolution, and Copy Chart.js config hands you the exact JSON to reproduce it in code.

Example

Suppose you paste this monthly table with a header row:

Month,Revenue,Costs
Jan,12400,8200
Feb,13950,8600
Mar,15100,9100

The first column (Month) becomes the x-axis labels and the two numeric columns (Revenue and Costs) become two series. Leave the type on bar and you get a grouped bar chart comparing revenue against costs each month; tick Stacked to see the combined total; switch to line and tick Fill area for a trend view. Set the export size to 1600×900, recolour Revenue green and Costs red, and download a sharp PNG ready for a board slide. Every figure is processed locally — nothing is uploaded.

Tips

For a single-metric pie chart, keep two columns: labels in the first, values in the second.
Pasting straight from Excel or Google Sheets usually comes through as tab-separated — leave the delimiter on auto-detect and it just works.
Use @2x export plus a transparent background when placing charts over coloured slides.