GraphMaker

Free online graph maker · nothing is uploaded

Turn CSV & Excel data into charts in seconds

Line, area, bar, scatter, histogram, box, pie and radar charts from your spreadsheet — plus trend lines, forecasts, ML predictions and statistics. Everything runs in your browser. No signup.

Drop a CSV, TSV or Excel file anywhere or click to browse .csv .tsv .txt .xlsx .xlsm

About GraphMaker

Free online graph maker for CSV, TSV & Excel data

GraphMaker is a free online graph maker that turns spreadsheet data into charts without installing anything and without creating an account. Drop in a CSV, TSV or Excel file — or paste a table straight from Excel or Google Sheets — and the tool detects your column types, picks sensible axes and draws line, scatter, bar, histogram and pie charts immediately. Everything happens in your browser: no upload, no server, no waiting.

Use it as a CSV to chart converter, an Excel to graph tool, or a quick way to turn any pasted table into a picture you can share. Because parsing runs locally, it is also the privacy-safe choice: sensitive spreadsheets never leave your device, not even to us. Large files are supported too — up to 100 MB of delimited text or 200,000 rows per sheet, with long series evenly sampled on the fly.

Chart types you can create

Five chart kinds, drawn side by side from the same file.

  • Line graph maker

    Plot trends over dates or categories, with up to three series on one shared axis and optional gap-bridging for sparse data.

  • Bar chart maker

    Compare categories side by side — plain or stacked — with labels taken straight from your data.

  • Scatter plot maker

    Show the relationship between two numeric columns on a true numeric X axis — ideal for correlations and lab data.

  • Histogram maker

    See the distribution of any numeric column with even-width bins (5–40, following the √n rule), shared across every selected series.

  • Pie chart maker

    Show each category's share of a total — duplicate labels are summed, zero and negative rows are skipped, and huge slice counts pool into “Other”.

  • PNG & CSV export

    Download any chart as a high-resolution PNG with a solid backdrop, or export the exact plotted data as CSV.

Trend lines, forecasts & machine-learning predictions

GraphMaker is more than a chart generator — it also works as a free prediction tool. Turn on Trend & forecast for any numeric X axis and it fits a model to every selected Y column, overlays the fitted trend, and extends it into a dashed forecast beyond your last data point. Type any X value into the predict box and every series answers with an instant value estimate; each fit's R² quality is shown right in the chart legend. Five models are built in, chosen in one dropdown:

  • Linear regression

    The classic least-squares trendline — slope, intercept and R² — for data that climbs or falls steadily.

  • Polynomial (degree 3)

    Fits smooth curves for rounded, accelerating or decelerating relationships.

  • k-nearest neighbours (k-NN)

    Follows local patterns without assuming any global shape.

  • Random Forest

    Forty bagged decision trees averaged together — robust, non-linear, hard to overfit.

  • XGBoost-style gradient boosting

    Shallow boosted trees with a learning rate — strong accuracy on complex trends.

  • Everything still runs in your browser

    The model fitting, the forecasts and the predictions are computed locally from the seeded libraries — the same fit powers the chart overlay and the predict box, and nothing is ever uploaded.

How to make a graph from your data

  1. Load it — drop a file anywhere on the page, browse for it, or paste a table. No sample file? The built-in sample data loads in one click.
  2. Tune it — GraphMaker picks the X column and up to three Y series automatically; switch columns, chart type or stacked bars with the controls, rename the title if you like, and turn on Trend & forecast to overlay a fitted model, extend it into a forecast and predict values at any X.
  3. Export it — save any chart as a PNG, or export the plotted values as a CSV. Both are ready for reports, slides and papers.

Supported file formats

  • Delimited text — .csv, .tsv, .tab, .txt, .psv with comma, tab, semicolon or pipe delimiters; quoted fields, embedded newlines, CRLF/LF/CR line endings and ragged rows.
  • Excel workbooks — .xlsx, .xlsm and .xltx, including multi-sheet workbooks, read by real openpyxl running as WebAssembly. Legacy .xls files should be re-saved first.
  • Encodings — UTF-8 (with or without BOM), UTF-16 LE/BE and a Windows-1252 fallback instead of mojibake; you can override the guess any time.
  • Number formats — English 1,234.5 and European decimal comma 1.234,56 both parse as real numbers.
  • Dates — ISO-style values like 2024-05-06, 2024/05/06 and 2024-05-06 14:30 are typed as real dates and sort correctly on the axis.
  • Paste — copy a table from Excel, Google Sheets or any web page and press Ctrl/⌘ + V.

Frequently asked questions

How do I make a graph from a CSV file?

Drop the CSV file onto the page or click the drop zone to browse for it. GraphMaker detects the delimiter, the header row and each column's type, picks an X axis and up to three numeric Y series, and draws line, scatter, bar, histogram and pie charts at once. Change the columns or options if you like, then download any chart as a PNG.

Is GraphMaker free to use?

Yes. GraphMaker is 100% free, with no account, no signup and no watermark. Any chart can be exported as a PNG or CSV file you can use anywhere.

Do I need to install anything or create an account?

No. GraphMaker runs in any modern web browser on Windows, macOS, Linux, ChromeOS, iOS or Android. There is nothing to install and no account to create — open the page and drop a file.

Is my data uploaded to a server?

No. Everything runs client-side: CSV and TSV files are parsed by JavaScript in your browser, and Excel workbooks are read by real Python (openpyxl) compiled to WebAssembly running inside this very tab. Nothing is ever uploaded — there is no server to upload to.

Which file types does the graph maker support?

Delimited text files (.csv, .tsv, .tab, .txt, .psv) and Excel workbooks (.xlsx, .xlsm, .xltx), including multi-sheet workbooks. Legacy .xls files need to be re-saved as .xlsx or .csv first. You can also paste tables from Excel or Google Sheets.

Can I paste data from Excel or Google Sheets?

Yes. Copy any table (Ctrl / ⌘ + C) and paste it straight onto the page (Ctrl / ⌘ + V). HTML tables from Excel, Google Sheets or web pages and plain delimited text both work.

How large can my files be?

Text files up to 100 MB, workbooks up to 50 MB, and 200,000 rows per sheet. Each series is evenly sampled to at most 15,000 points per chart — the app tells you whenever it samples.

What charts can I create?

Line graphs, scatter plots, bar charts (plain or stacked), histograms and pie charts — all drawn from the same file, side by side, with editable titles, colours and axes.

Can I predict or forecast values from my data?

Yes. Switch on Trend & forecast and GraphMaker fits a model to your X/Y data — linear regression, a degree-3 polynomial, k-nearest neighbours, Random Forest or XGBoost-style gradient-boosted trees — draws the fitted trend and a dashed forecast with each fit's R², and predicts values for any X you type. All of it is computed locally in your browser; nothing is uploaded.

Private by design

GraphMaker is built on a simple promise: your data stays yours. There is no backend, no analytics on your file contents and no third-party upload step. The charting engine is open technology you can inspect — the same engine even runs from the command line via python3 python/graphmaker.py data.csv. Drop a file and see for yourself.

Make a graph now