Online Tool Store
Chart Maker
Paste label-value data and instantly get a bar, line, or pie chart, downloadable as a PNG. Runs entirely in your browser — nothing is uploaded.
🔒 This tool runs entirely in your browser. Your files are never uploaded to a server.
One "label, value" pair per line — comma or tab separated. An optional header row (like "Quarter,Sales") is detected automatically. Example shown — replace it with your own data.
| Label | Value | Share |
|---|
How it works
- Paste your data, one label and value per line (comma or tab separated).
- Choose Bar, Line, or Pie — the chart and the data table below it update instantly.
- Click Download PNG to save the chart as an image.
How each chart type reads your data
Bar and line charts plot each value against a shared zero baseline, so they work with negative numbers — bars extend downward, and the line simply dips below the axis. A pie chart instead expresses each value as a percentage of the total:
slice share (%) = (value / sum of all values) × 100
Example: the four quarters shown by default (4,200 / 5,100 / 3,900 / 6,200) sum to 19,400 — as a pie chart, Q4 is the largest slice at about 32%.
FAQ
What format does my data need to be in?
One "label, value" pair per line, separated by a comma or a tab — the same shape you get pasting a two-column selection straight out of a spreadsheet. An optional header row (like "Quarter,Sales") is detected automatically and skipped.
Can I paste data straight from Excel or Google Sheets?
Yes — select two adjacent columns and paste. Spreadsheets copy cells as tab-separated text, which this tool reads the same way as comma-separated data.
Why does the pie chart reject some of my data?
A pie chart represents each value as a share of the whole, so negative numbers and an all-zero dataset don't have a meaningful slice to draw. Bar and line charts don't have this restriction — they'll plot negative values below a zero line.
How many data points can I chart?
Up to 25 rows — past that, labels get too cramped to read on a single chart. Split larger datasets into a few smaller charts instead.
Is my data uploaded anywhere?
No. Parsing and drawing both happen locally in your browser using the Canvas API — your data is never sent to a server, including when you download the chart as a PNG.
How we compare
| Feature | Online Tool Store | Spreadsheet chart tool | Online chart makers |
|---|---|---|---|
| No sign-up or spreadsheet setup | ✓ | ✗ | Varies — some require an account |
| No file upload — data stays in your browser | ✓ | ✓ | ✗ |
| Free, no watermark, no daily limit | ✓ | ✓ | Daily limit or watermark on free plan |
If you just need a quick chart from a couple of pasted columns — not a full spreadsheet, and not another account — Chart Maker gets you a downloadable PNG in one page.