What is a Support Resistance Finder?
This tool finds strict local highs and lows and groups nearby swing prices into zones. A high must exceed the selected number of bars on both sides; a low must be below them. The final lookback bars are unconfirmed and excluded. Those later bars make this a historical description, not a signal available at the original turning point.
High-origin clusters are labeled resistance and low-origin clusters support, regardless of their position relative to the last input close. A label does not establish buying or selling pressure or predict that the zone will hold. No trading outcome has been measured by this calculator.
How to Use This Support Resistance Finder
- 1
Prepare Your OHLC Data
Export historical price data from your broker, TradingView, or any charting platform. The data should include high, low, and close. Open defaults to close; dates and volume are optional. Use one timeframe in oldest-to-newest order and match the sample’s simple format.
- 2
Upload or Paste Your Data
Upload a CSV or JSON file, or paste your data directly into the text area. The tool automatically parses and validates your data format.
- 3
Adjust Detection Parameters
Fine-tune the zone tolerance (how close prices must be to cluster), minimum swing points (filter weak levels), and swing lookback (bars on each side required for confirmation).
- 4
Analyze the Results
Review the identified support and resistance levels, their price ranges and swing counts. Centers are unweighted means; the diagram compares them with the last input close, not a live market quote.
- 5
Export for Review
Download the identified levels as a CSV file to use in a spreadsheet or further analysis. No platform import or Pine Script integration is performed automatically.
Why Use Our Support Resistance Finder?
Algorithmic Precision
The same input and settings produce the same clusters. The lookback, tolerance, selected history, and clustering rule remain modeling choices, not proof of objectivity.
One Timeframe per Import Support
Import bars from one consistent timeframe. This page does not combine timeframes or resample bars automatically.
Swing-Bar Volume Analysis
Available volumes from qualifying swing bars are summed. Volume does not weight the center or count and is not an estimate of volume traded at that price zone.
Swing Counts
Count buckets summarize how many strict swing points were grouped. More points do not establish a greater probability of a future reversal.
Export Functionality
Export the current levels, ranges, counts, and available swing-bar volume for review. CSV export does not install an indicator or place an order.
Privacy Protected
This calculator parses the supplied file and computes zones in your browser; it does not upload that file to an API. An export is saved to the location chosen by your browser.
Trading with Support and Resistance Levels
Bounce Trading (Reversals)
A bounce rule would need a precisely defined entry, exit, and failure condition. Test it using only swings confirmed at that point in time, with costs and gaps included.
Breakout Trading
A zone crossing does not prove follow-through or automatic role reversal. This tool preserves the high/low origin label and does not test breakout trades or retests.
Zone Confluence
Additional filters are separate hypotheses. Adding more conditions after inspecting historical results can overfit; compare them on data not used to choose the settings.
Frequently Asked Questions
How are swings detected?
A swing high must exceed every high in the selected number of bars on each side; a swing low must be below every surrounding low. Equal extremes are not swings. Confirmation requires that many later bars, so the most recent bars cannot yet qualify.
How are zones clustered?
High and low swings are grouped separately. Prices are sorted, then each point joins the first cluster whose running arithmetic mean is within the tolerance. The tolerance is a percentage of the entire input’s mean bar midpoint. Changing the input history can therefore change old clusters.
Does volume determine the level or strength?
No. The center is an unweighted arithmetic mean, and the count is the number of qualifying swing points in the cluster. Available swing-bar volumes are summed for display only. They are not volume-at-price and do not weight the center or count.
What do support and resistance mean here?
Support labels originate from swing lows and resistance labels from swing highs. They are historical categories and are not reassigned when the latest close crosses a level. Repeated swing points do not prove future reliability or buy/sell pressure.
Which data can I import?
Use one instrument and one consistent timeframe, in oldest-to-newest order. Simple comma-separated CSV needs high, low, and close headers; open defaults to close, and date and volume are optional. JSON accepts the same fields. Dates, when provided, must be parseable and strictly increasing. The limit is 5,000 rows; file uploads are limited to 2 MB.
Is this a backtest or a live signal?
No. It clusters the complete loaded sample and uses future bars to confirm historical swings. It does not simulate trading costs, orders, or performance. For a historical trading test, build each decision only from data and confirmed swings available at that time.