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Seamless pattern checker
See if a pattern repeats without a visible line - tiled straight or half-drop, with the joins that show marked red.
or drop it here
How to use the seamless pattern checker
- Add your patternA repeat tile, a texture or any design - JPG, PNG or WEBP.
- See the verdictEvery join is measured: seamless, a faint line, or a line that shows.
- Check it tiled2 × 2 to 4 × 4 tiles, straight or half-drop; the joins that show are marked red.
- Fix or downloadDownload the tiled preview - or open the repeat block maker to join the edges.
Made for
- Designers checking a repeat before sending it to print
- Printers checking a customer's file before making screens
- Wallpaper, gift-wrap and website background designs
- Game and 3D artists checking seamless textures
About this tool
A pattern is seamless when its right edge continues into its left edge and its bottom edge into its top - then copies placed side by side show no line. A tiny step in colour at the edge is enough to show a line every repeat across a whole roll of fabric. This checker tiles the design and measures each join against the design's own inside: if the step across the join is no bigger than the steps between neighbouring pixels within the design, the join cannot be seen. It checks straight and half-drop repeats and marks in red the parts of a join that would show. Everything happens in your browser - nothing is uploaded.
Questions
How do I know if a pattern is seamless?
Put copies of it side by side and on top of each other: if no line shows where they meet, it is seamless. This checker does that for you and also measures every join - left to right and top to bottom - against the design's own inside.
What do the red marks mean?
They show the parts of a join where the colours do not continue - the places where a line will be seen on the printed fabric, wallpaper or website background.
Does it check half-drop repeats?
Yes. A design that does not join straight is also checked as a half-drop (every second column half a block lower), the most used repeat for all-over prints.
My design is not seamless - how do I fix it?
Open it in our repeat block maker: it joins the edges for a straight, half-drop or brick repeat so no line shows.
Is my design uploaded?
No. It is checked inside your browser, on your own computer.
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