Free image tool
Seamless Pattern Checker: Find the Seam Before Your Buyers Do
Drop in one pattern tile. See it repeat, and get a measured seam score for basic, half-drop and half-brick repeats.
Drop in one pattern tile. See it repeat, and get a measured seam score for basic, half-drop and half-brick repeats.
The edge score compares the pixels that meet at a seam with the normal step between neighbouring pixels inside your tile. 1x means the seam looks like the rest of the image. Above 2x, a line usually shows. Big tiles are scored on a copy scaled to 2048 px.
A tile is seamless when its right edge flows into its left edge, and its bottom edge flows into its top edge. The checker reads both pairs of edges pixel by pixel. It then compares the jump across the seam with the jump between any two neighbouring pixels inside your tile.
That second number matters. A busy texture has big jumps everywhere, so a big jump at the seam is normal there. A soft watercolour has tiny jumps, so even a small step at the seam shows as a line. A tiled preview alone leaves that call to your eyes. The score gives you a number.
| Repeat | How the tiles sit | What the tile needs |
|---|---|---|
| Basic | Straight rows and columns | Left matches right, top matches bottom |
| Half-drop | Every second column moves down by half a tile | Left matches right half a tile lower, and an even pixel height |
| Half-brick | Every second row moves right by half a tile | Top matches bottom half a tile across, and an even pixel width |
A tile can pass basic and fail half-drop. Motifs that cross the side edge get cut in the wrong place when the next column drops by half. Fabric printers like Spoonflower let you pick the repeat type at upload, so check the one you will choose.
The even-pixel rule is simple. Half of a 2001 px tile is 1000.5 px. A printer cannot place half a pixel, so a thin line can show where the halves meet.
Spoonflower says it prints at a minimum of 150 DPI. The printed size is the pixels divided by 150: a 1800 x 1800 px tile repeats every 12 inches. The checker shows the size at 150 and at 300 DPI. Use the DPI calculator to work out the pixels for a target size, and the image resolution checker for stock and Etsy minimums.
Once the pattern tiles cleanly, the next step is the listing. Our guides on how to sell digital art and how to sell on Redbubble cover where patterns sell and how to list them.
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