Leeds Chart Generator

Leeds Chart Generator Instructions

This tool helps you create a Leeds Chart from your Ancestry DNA match data to visualize shared ancestors.

Part 1: Initial DNA Match Data (The List)

1. Go to your Ancestry DNA Matches page.
2. Find your highest matches (typically in the 90-400 cM range).
3. Copy the data: Highlight and copy the name, cM amount, and relationship for a group of your closest matches. You can scroll down and copy a large block of text.
4. Paste: Paste the copied text into the large grey box in the "Leeds Chart" tab.
5. The chart will populate with Match Name and cM value.
6. A modal will appear asking if you want to add more data. Choose 'Yes' to add more matches to the main list, or 'No' to proceed to shared matches (grouping).

Part 2: Shared Matches (The Grouping)

7. Once you select 'No' (or if you already have matches in the chart), the status message will update to guide you.
8. Go to the first high-cM match in your chart (it will be highlighted yellow). This match is the person you will be creating a group for.
9. View Shared Matches: Click on that match's name in Ancestry to view their shared matches list.
10. Copy Shared Matches: Copy the list of Shared Matches for that person. You can copy the 'PRO' shared matches page or the regular shared matches page text.
11. Paste: Paste the shared match data into the grey box. The chart will add a new column (Group 1) and place a colored dot next to every name that is a shared match with the person you selected.
12. A modal will appear asking: "Add more matches to this column?".
    • Choose 'Yes' if you have more shared match data for *the same group* (e.g., if the Ancestry list was split across multiple pages).
    • Choose 'No' to create a new column (Group X) for the next person's shared matches.
    • Choose 'Finished' when you have created all your groups.
13. Repeat steps 8-12 for the next high-cM match that does not yet have a dot in any group column. This is the core of the Leeds Method.

Tips & Features

• Edit Header: Click on a Group header (e.g., "Group 1") to rename it (e.g., to "Maternal Grandmother").
• Merge Columns: Use the "Merge Columns" button to combine dots from two groups into one.
• Save/Load: Use "Save" to save the chart data to your computer, and "Load" to load it back. The data is saved in a **JSON** format.
• Save as CSV: Exports the chart data to a **CSV** file.
• Copy Image: Copies a snapshot of the chart directly to your clipboard.
• Highlighted Row: The yellow highlighted row indicates the highest-cM match that hasn't been grouped yet, guiding you on who to check next.