What makes a pattern 'seamless'?

A seamless pattern's edges line up perfectly when tiled so the repeat is invisible. This tool shows you the tiled result so seams are easy to spot.

Are my uploads private?

Yes — processing is 100% in-browser. Your patterns never leave your device.

PNG and JPG. Transparent PNGs work too (useful for overlay patterns).

1000 × 1000 pixels, tiled according to your chosen tile size. Great for Etsy previews and portfolio mockups.

Yes. Upload a batch and switch between them with the arrow keys or the thumbnail strip.

Yes — free for every Mockably user. No credits or watermarks.

Free tool

Test if your repeat pattern tiles seamlessly. Upload the image, adjust tile size, and spot seams instantly.

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Preview repeating patterns and quickly identify visible seams.

Why Seamless Checker

See your pattern repeated across the whole canvas the moment you upload.

Slide to scale the tile between 50–1000px to preview any use case.

Drag the tiled canvas to shift the repeat and inspect seams anywhere in the pattern.

Toggle a grid overlay to make seams pop even in subtle patterns.

Upload several patterns and switch between them with arrow keys.

Download a high-quality tiled preview ready for Etsy listings or portfolio shots.

Process

1
Upload your pattern
Drag and drop a PNG or JPG of the single-tile pattern you want to test.
2
Adjust tile size
Slide the tile-size control to match your target use (small repeats vs. large).
3
Toggle the grid & inspect
Turn on the grid overlay to clearly see tile edges. Any visible seams need fixing.
4
Download a 1200px preview
Export a ready-to-use tiled preview for listings, portfolio, or testing.