Read a connected path
Tie at nail 1. Step 1 gives a from nail and a to nail; run to the destination, then continue from there on the next step. Each step starts where the previous one ended. The tool never tells you to cut between ordinary steps.
The CSV contains step number, both nail numbers, straight chord length and cumulative straight length. Text output includes orientation and the same sequence. Print or keep these files as a non-browser reference.
Use playback deliberately
The animation is a visual preview, not a sensor. It cannot tell whether you have wrapped a nail. Pause it while working, then use Previous and Next or type a step number to move at your own speed. The active chord and endpoint numbers show the step being inspected.
Show complete preview lets you judge the overall design while still highlighting a selected step. Turn it off to inspect only the path up to your current position. At step zero the thread has not yet left nail 1.
Save the plan as well as the position
Save current project writes a JSON file containing settings, the reduced grayscale target, the winding sequence and your player position. Reopening it does not regenerate a different sequence. Keep this file with your template, because changing the image or settings creates a different project.
The browser may remember the player position for the exact plan when local storage is available. Private browsing, cleared storage or another device can remove it. Download a checkpoint before closing the page; treat the project as private because its reduced target still depicts your subject.
Buy thread with a measured reserve
The straight-path figure is the sum of the distances between successive nail centers. It excludes thread wrapped around nail shafts, knots, slack, breaks and mistakes. The extra percentage is an editable allowance, not a guarantee that one spool will be sufficient.
Use the actual thickness of your thread as a starting input, then compare a physical sample with the preview. If you must restart, use the saved sequence and position rather than creating a new plan halfway through the piece.