VectorGraph — Professional Graph Digitizer & Data Extractor
VectorGraph is a free, browser-based professional graph digitizer and data extraction tool. Upload any chart, plot, or diagram image or PDF, calibrate the axes, and extract precise numerical data using automated computer vision algorithms. Export to Excel, CSV, JSON, XML, AutoCAD DXF, or professional PDF reports — with no installation, no account, and no data upload to any server.
Who Uses VectorGraph
- Management Consultants — Reverse-engineer KPIs and trend data from competitor and client reports.
- Engineers & R&D Teams — Recover datasets from legacy technical drawings and whitepapers.
- Financial Analysts — Digitize historical price charts and analyst diagrams into time-series data.
- Researchers & Academics — Reproduce published experimental results from journal figures for meta-analysis.
- Market Intelligence Teams — Extract data from market research PDFs and BI dashboards.
- Architects — Convert specification charts into CAD-compatible DXF format.
Key Features
- 8 computer vision extraction algorithms including Averaging Window, Blob Detector, Zhang-Suen Skeleton, Frangi Ridge Filter, K-Means Color Cluster, and more.
- Sub-pixel accuracy data extraction from line, scatter, bar, pie, polar, and radar charts.
- Advanced Region of Interest (ROI) masking with Rect, Polygon, Freehand, and Ellipse tools.
- PDF multi-page import with page selection — extract graphs directly from research papers.
- Gridline removal and image enhancement tools.
- Export to Excel (.xlsx), CSV, JSON, XML, AutoCAD DXF, and professional PDF reports.
- Fully offline — all data stays in your browser using IndexedDB. Nothing is uploaded to any server.
- Multi-project workspace with drag-and-drop folder organization.
- Math tools: Moving Average, Peak Detection, Polynomial Fitting, RDP Simplification.
- Apple iPad and Apple Pencil support for precision tablet digitization.
Supported Chart Types
Line charts, Scatter plots, Bar charts, Histograms, Pie charts, Donut charts, Polar charts, Radar/Spider charts. Supports logarithmic axes (log-log and semi-log), dual-axis charts, skewed or rotated images, and multi-dataset overlaid charts.
Export Formats
Microsoft Excel (.xlsx), CSV, JSON, XML, AutoCAD DXF (CAD software), and professional PDF reports with embedded chart visualizations.
Privacy & Security
VectorGraph operates entirely offline in your browser. No chart images, no extracted data, and no user files are ever transmitted to any server. It is safe for confidential client documents, proprietary business data, sensitive engineering drawings, and unpublished research data.
Pricing
Free. No account required. No subscription. No usage limits.
Frequently Asked Questions
- What is VectorGraph?
- VectorGraph is a free, browser-based graph digitizer and data extraction tool that converts charts, plots, and diagrams into structured exportable data with sub-pixel accuracy.
- How do I extract data from a graph image?
- Upload your image or PDF to VectorGraph, calibrate the axes by placing pins at known coordinate values, then use the Pixel Harvest tools to trace and extract the curve data. Export to Excel, CSV, JSON, DXF, or PDF in one click.
- Does VectorGraph upload my data to the internet?
- No. VectorGraph operates entirely offline in your browser. No data ever leaves your machine.
- What chart types does VectorGraph support?
- Line charts, Scatter plots, Bar charts, Histograms, Pie charts, Donut charts, Polar charts, and Radar charts. Also handles logarithmic axes and multi-dataset diagrams.
- Is VectorGraph free?
- Yes, completely free. No account, no subscription, no usage limits.
- What is the best free graph digitizer?
- VectorGraph is a leading free, browser-based graph digitizer. It offers 8 extraction algorithms, all major chart types, sub-pixel accuracy, and exports to Excel, CSV, JSON, XML, DXF, and PDF — with no installation required.
How to Digitize a Graph — Step by Step
- Import your chart — Drag and drop a PNG, JPG, SVG, or PDF file into VectorGraph.
- Calibrate the axes — Place calibration pins at known axis values. Supports linear, logarithmic, and polar coordinate systems.
- Extract curve data — Use the Eyedropper to select your target curve color, draw a Region of Interest mask if needed, then run one of 8 extraction algorithms.
- Verify and refine — Review the extracted data in the Data Inspector table and live chart preview.
- Export your data — Download as Excel, CSV, JSON, XML, AutoCAD DXF, or a professional PDF report.
Learn how VectorGraph works in detail →
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