Seamless Pattern Checker
Tile your pattern as a full, half-drop, or half-brick repeat, then zoom into the seams — nothing is uploaded, so commercial and client pattern files stay on your device.
Everything runs locally in your browser. Nothing is uploaded to any server — close the tab and your files are gone.
How to use
Drop your pattern tile
Add one JPEG, PNG, WebP, or GIF tile — the square or rectangular piece of artwork meant to repeat. It’s read directly in your browser; nothing is uploaded.
Pick a repeat mode
Full repeat lines tiles up in a straight grid. Half-drop shifts alternating columns down by half a tile — common for florals and wallpaper. Half-brick shifts alternating rows sideways by half a tile, like a brick course.
Zoom, drag, and check the seams
Use the zoom slider to see more or fewer tiles at once, and drag inside the preview to move a specific part of the artwork onto a seam. Turn on tile boundaries and watch the junction magnifier for lines, color jumps, or cut-off shapes.
Download the preview
Save the tiled view as a PNG to share with a client or keep as a reference — it’s a snapshot of what you’re currently looking at, not a fix for the pattern itself.
Frequently asked questions
What’s the difference between half-drop and half-brick, and when should I use each?
Half-drop shifts every other column down by half a tile height — it’s the standard for wallpaper and florals because it breaks up any obvious vertical repeat. Half-brick shifts every other row sideways by half a tile width instead, which suits brick-like or linear motifs and is common on yardage printed on rotary screens. Full repeat (a straight grid) works fine for geometric or all-over prints where a visible grid isn’t a problem.
What exactly should I look for at the seams?
Zoom into the junction magnifier and check for a visible line or gap, a sudden jump in color or value, and any shape — a leaf, a dot, a stripe — that gets cut off at the edge and doesn’t continue smoothly in the next tile. Any of those means the tile isn’t cropped or aligned for a clean repeat yet.
Why does it matter that my pattern file never leaves my device?
Pattern files are usually unreleased, licensed, or client work, so uploading one anywhere is a real risk before it’s even approved. This tool tiles the image entirely in your browser — there’s no upload step at all, so a proprietary pattern never touches a server.
My tile is a huge file — will it still work?
Yes, with one limit: tiles over 4096px on the longest side are tiled from a 2048px working copy so panning and zooming stay smooth. You’ll see a note when this happens. It only affects live preview sharpness at extreme zoom, not the file you’re checking.
Can this tool fix seams for me?
No — it only shows you the repeat so you can judge it by eye; it doesn’t edit the file. To fix a seam, use Photoshop’s Offset filter (Filter > Other > Offset) to bring the edge into the middle of the canvas where it’s easy to retouch, or in Illustrator, adjust the artwork inside the pattern tile and re-check it here.
Which file types can I check?
JPEG, PNG, WebP, and GIF. PNG is the safest choice for tiles with hard edges or flat color, since JPEG compression can soften edges right at the seam and make a clean tile look like it has a problem it doesn’t.