A pie chart maker cheat sheet is a one-page reference that lists the exact input format, the rules for blank or malformed lines, the formula the tool uses to convert values into slice percentages, and the practical limits of the download. The cheat sheet you actually need is short: type one label and one number per line, separated by a comma, and the chart redraws the moment you press enter. Each slice is sized by its share of the total, colored from a built-in palette, and listed in a legend that shows the label, the raw value, and the percentage. You never type percentages yourself — every slice's share is its value divided by the sum of all values, so the chart always adds up to 100 percent. The download is a PNG with a white background, generated on your own device, and nothing you type is sent to a server. This page collects the format, the math, the limits, and the small habits that turn a rough list into a chart you can drop straight into a slide, a report, or a chat.
Input Format Cheat Sheet
Every chart begins with the same one-line format. Each row is a single category, with the label on the left, a comma, and the raw number on the right. Blank lines are ignored, extra spaces around the label and the number are trimmed, and any line without a valid non-negative number is skipped — so messy pastes still produce a chart. Values can be whole numbers or decimals, and zero is accepted. Because the value is read from the last comma on each line, a label can safely contain a comma, like North America, US.
| Field | Format | Example | Rule |
|---|---|---|---|
| Label | Text before the last comma | Chrome | Free text, can include commas |
| Value | Number after the last comma | 63 | Non-negative integer or decimal |
| Line break | One category per line | Safari, 20 | Blank lines are ignored |
| Title | Optional text field | Browser share, Q4 | Renders above the chart |
If you are starting from a spreadsheet, paste just two columns — labels and values — and the tool will do the rest.
How to Make a Pie Chart in Three Steps
- Enter your data in the box, one item per line in the format "Label, Value" — for example, "Chrome, 63" on one line and "Safari, 20" on the next.
- Watch the chart redraw as you type. Each slice is colored, sized by share, and listed in a legend that shows the label, the raw value, and the percentage.
- Add an optional title and click Download to save the chart as a PNG image with a white background.
The whole flow lives inside your browser tab. The chart is drawn on an HTML canvas from only the numbers you enter, so redraws are immediate and there is no upload step between you and the finished PNG.
The Percentage Formula
Percentages are computed for you using the same formula every time. For each slice, the percentage equals its value divided by the sum of all values, multiplied by 100. So if your total is 100 and a slice is 63, the slice shows 63 percent; if the same slice sits inside a total of 200, it shows 31.5 percent. Because the tool works the math out from the numbers you provide, the slices always add up to the whole — there is no rounding gap to fix in a spreadsheet afterwards.
A worked example with a four-row data set:
- Total values: 63 + 20 + 10 + 7 = 100
- Chrome share: 63 / 100 = 0.63, or 63 percent of the pie
- Safari share: 20 / 100 = 0.20, or 20 percent of the pie
- Firefox share: 10 / 100 = 0.10, or 10 percent of the pie
- Other share: 7 / 100 = 0.07, or 7 percent of the pie
The slices always sum to 100 percent, even when your raw numbers do not. If your numbers add to 237, each percentage is still its share of 237, and the chart still draws a complete circle.
Tips That Make the Chart Easier to Read
- Keep slices to a handful. Pie charts read best with about two to six categories. If you have more, group the smallest ones into a single "Other" row so the chart does not turn into confetti.
- Order rows from largest to smallest. Slices are drawn in the order you list them, starting from the top, so listing the biggest share first produces a cleaner read.
- Keep labels short. The legend mirrors the label text, and a tidy legend is easier to scan than a wrapped one. Use the title to explain the whole pie instead of squeezing context into each slice name.
- Use decimals when you need them. Whole numbers are not required; values like 12.5 are accepted and render the same way as whole numbers.
- Treat zero as a real value. A row with a value of zero produces a slice with no visible width, so it does not distort the chart — useful when you want to acknowledge a category that contributed nothing.
Common Mistakes and Quick Fixes
- Forgot the comma. A line like Chrome 63 is treated as one token. The number is missing, the line is skipped, and the chart silently drops the category. Fix: put a comma between the label and the value.
- Pasted a header row. If the first line is Browser, Share instead of a number, it is skipped. The chart still draws from the rows below it.
- Negative number. Lines with a negative value are skipped because the tool only accepts non-negative numbers. Fix: replace negatives with their absolute value, or remove the row.
- Too many slices. More than about eight slices fights the eye. Fix: bundle the smallest categories into a single "Other" row and re-export.
- Label wrapped across two lines. A wrapped line looks like two rows to the parser. Fix: keep each category on a single line so the parser sees the comma on the right row. For larger or messier columns, the Pie Chart Maker bulk paste walkthrough covers the same patterns in more depth.
Privacy, Limits, and What the Tool Will Not Do
The chart is drawn entirely on your device using an HTML canvas inside your browser, and the PNG is generated locally. Nothing you type is sent anywhere, so it is safe to use with confidential numbers — internal metrics, budgets, survey results, or anything else you would rather not upload. There is no sign-up, no install, and no waiting on a server round-trip; redraws feel immediate even as you tweak the numbers.
| Question | Answer |
|---|---|
| Is the data uploaded? | No, processing happens locally in the browser |
| What is the output format? | PNG image with a white background and crisp edges |
| Are percentages auto-calculated? | Yes, from each value's share of the total |
| Can labels contain commas? | Yes, the value is read from the last comma on the line |
| Are blank lines an error? | No, blank lines are ignored |
| Can I add a title? | Yes, the optional title appears above the chart |
The tool is also deliberately narrow. It does one job: turn a list of labels and values into a clean, flat pie chart with a legend, a title, and a download. That focus is the point: a fast, private way to go from a list of numbers to a shareable PNG. For heavier formatting inside a slide deck or a sheet, you can drop the downloaded PNG into PowerPoint, Google Slides, or Excel as a regular image, or run a dedicated editor on top.
Putting the Cheat Sheet to Work
The fastest way to use this page is to treat it as a checklist. Confirm your data is one label, one comma, one number per line. Skip any headers, negatives, or stray rows. Add a title that names the whole pie. Click Download. Drop the PNG into wherever it needs to live. If you want to experiment with the format, the Pie Chart Maker accepts the exact input described above and redraws the moment you type — so you can paste a real column from a spreadsheet, watch the chart settle, and tweak the order until the legend reads cleanly before you save.
Related reading: What to Do When Bored: A One-Page Cheat Sheet.