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Interactive Drawing Tool

Free Trendline & Angle Analyzer

Upload your price data and draw trendlines directly on the chart. Measure angles between lines to identify chart patterns like wedges, triangles, and channels.

CSV & JSON Support
Auto-Save to Browser
100% Free

Upload Price Data

Required Format (OHLC Data)

CSV Format:

date,open,high,low,close
2026-01-01,100.0,101.5,99.0,100.5
2026-01-02,100.5,102.0,99.5,101.0

JSON Format:

[
  {"date":"2026-01-01","open":100,"high":101.5,"low":99,"close":100.5}
]

Drawing Tools

Color:

What is a Trendline in Technical Analysis?

A trendline is one of the most fundamental tools in technical analysis. It's a straight line drawn on a price chart that connects two or more price points, helping traders identify the direction and strength of a market trend. Trendlines serve as dynamic support and resistance levels, providing visual cues for potential entry and exit points in trading.

Our free Interactive Trendline & Angle Analyzer lets you upload your own historical price data and draw trendlines directly on the chart. The tool automatically calculates the angle of each trendline and measures angles between multiple lines, helping you identify chart patterns like ascending triangles, descending wedges, and symmetrical patterns with precision.

How to Use This Trendline Drawing Tool

  1. 1

    Upload Your Price Data

    Export OHLC (Open, High, Low, Close) data from your broker or trading platform. Upload a CSV or JSON file, or use our sample data to get started immediately.

  2. 2

    Select the Draw Tool

    Click the "Draw" button and choose your preferred line color. You can use different colors to distinguish between support lines, resistance lines, and channel boundaries.

  3. 3

    Draw Your Trendlines

    Click on the chart to set the starting point, then click again to set the ending point. The tool instantly calculates and displays the angle of your trendline.

  4. 4

    Analyze Angles and Patterns

    Review the analysis table showing each line's angle, direction, and strength. When you have multiple lines, see the angles between them to identify converging or diverging patterns.

  5. 5

    Save and Export

    Your trendlines are automatically saved to your browser. Export the chart as an image to share your analysis or include it in your trading journal.

Why Use Our Trendline Analyzer?

Intuitive Drawing

Simple click-to-draw interface. No complex tools to learn - just click twice to create a trendline.

Automatic Angle Calculation

Instantly see the angle of each trendline and the angles between multiple lines for pattern identification.

Your Own Data

Upload CSV or JSON files from any broker. Works with stocks, forex, crypto, and futures data.

Persistent Storage

All your drawings are automatically saved to your browser. Come back anytime and continue your analysis.

Privacy First

Everything runs in your browser. Your price data and analysis never leave your device.

Export Charts

Download your annotated chart as a PNG image for your trading journal or to share with others.

Understanding Trendline Angles

Angle RangeInterpretationTrading Implication
0° - 15°Nearly horizontal, weak trendConsolidation phase, range-bound trading
15° - 30°Shallow angle, gradual trendSustainable trend, good for swing trading
30° - 45°Moderate angle, healthy trendIdeal trend strength, reliable support/resistance
45° - 60°Steep angle, strong momentumStrong trend but may be unsustainable
60°+Very steep, parabolic moveLikely to correct, watch for reversal signals

Frequently Asked Questions

What is a trendline in trading?

A trendline is a straight line drawn on a chart that connects two or more price points. It helps traders identify the direction of a trend (uptrend, downtrend, or sideways) and potential support or resistance levels. Trendlines are fundamental tools in technical analysis for making trading decisions.

How do I draw a trendline correctly?

For an uptrend, connect at least two higher lows with a straight line. For a downtrend, connect at least two lower highs. The more touch points a trendline has, the more significant it becomes. Our tool makes this easy - just click to set the start point and click again to set the end point.

What does the angle of a trendline tell you?

The angle of a trendline indicates the strength and sustainability of a trend. Steep angles (above 45°) suggest strong but potentially unsustainable moves. Moderate angles (30-45°) often indicate healthy, sustainable trends. Shallow angles (below 30°) may suggest weak momentum or consolidation.

How do I measure the angle between two trendlines?

Our tool automatically calculates the angle between any two trendlines you draw. Simply draw two trendlines on your chart, and the tool will display the angle between them. This is useful for identifying chart patterns like wedges, triangles, and channels.

Can I save my trendline drawings?

Yes! All your trendlines and uploaded price data are automatically saved to your browser's local storage. Your work persists between sessions. You can also export your chart as an image or clear all drawings to start fresh.

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Mastered Trendlines? Automate Your Trading Strategy

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