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Lab Data Grapher

Plot CSV or Excel data as scatter, line or bar charts with trend lines, equations and R², then export PNG or SVG.

Free, no uploads, no sign-up. Runs 100% in your browser.

How Lab Data Grapher works

All maths runs in your browser, instantly, with no account. Fits linear, quadratic, exponential, power and log curves by least squares.

Input: CSV, XLSX, ODS. Output: PNG, SVG.

How to use Lab Data Grapher

1. Paste data or open a file.
2. Pick X and Y columns.
3. Choose a chart and trend line.
4. Download PNG or SVG.

Tips

• Exact fractions are used where rounding would give wrong answers.
• Every tool works offline once the page has loaded.

Lab Data Grapher FAQ

Are my files uploaded?

No. This tool runs entirely in your browser tab. Files are read from your disk into memory and the result is generated locally.

Is it free? Are there limits or watermarks?

Free and open source (MIT). There are no file-size caps, daily quotas, accounts or watermarks.

Does it work offline?

Yes, once the page (and any engine it needs) has loaded, it keeps working without a connection thanks to the service worker cache.

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