The Celtic Knot Builder:

The Celtic Knot Builder is based on the brilliant Celtic Knot font
designed by Daniel L. Isdell of www.clanbadge.com. If you have the basic fill or the 3-d font installed on your system, the designer above will show the full tile-set.

Keyboard shortcuts:

<Space>
Cycle forward through the source blocks.
<SHIFT> + <Space>
Cycle backward through the source blocks.
<SHIFT>+ mouse click
Erase clicked square on design grid.
"A" and "D"
Rotates currently selected source block left or right.
"Z" and "C"
Rotates The entire grid..

INSTRUCTIONS:
Click on one of the source blocks.
Click on the grid to place your tiles.
Rotate block to the desired position using the Rotate Block Arrows.

When you are finished, press the Export Arrow to copy the knot to the Text Area, then select and copy the text to your clipboard.

If any of the Celtic Knot Fonts are installed on your system, you can enjoy your knot in your favorite word processor.

Resize the grid by changing the blue numbers on the upper left.

Or to resize without clearing the grid, just export your knot to the text area, and add spaces to make more columns, and add returns to add more rows, then re-import the new art.