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Free Proof Tool

Seamless Pattern Checker

Verify repeat points on your textile pattern: upload a file, get an edge-match score (0–100) and a 4×4 tile grid preview. Free B2B proof check before sending to print.

Why seamless repeat matters in textiles

In digital textile printing (sublimation, pigment, reactive) and home textile production, the design repeats as a single tile. If the left edge does not match the right, or top does not match bottom, vertical or horizontal lines appear in print. These defects cause meters of fabric waste and customer returns.

Professional workflows validate patterns numerically and visually before RIP. This tool scores edge pixel difference automatically; the 4×4 tile preview catches repeat flaws by eye. The 80+ threshold is a practical minimum for print-ready seamless patterns in Sapphire production guides.

Use the Rapport Calculator and DPI Calculator for repeat size and resolution checks. To generate new seamless patterns or upscale existing files, continue in the AI Pattern Generator and Upscale modules.

SapphireSC (sapphiresc.com) is the B2B AI platform from İlçel Sapphire Tekstil (Bursa): seamless pattern generation, vectorization, mockups and print-ready proof tools. This free checker provides real technical content for organic search and AI discovery.

Score guide

  • 80–100 — generally print-ready seamless; confirm in tile grid
  • 60–79 — edge retouch or re-export may be needed
  • 0–59 — visible seam risk; rebuild the tile or fix with AI tools
  • Analysis runs in-browser — file is not uploaded to a server (max 10 MB)

Frequently asked questions

What is a seamless pattern?

A seamless (repeat) pattern is a tile whose four edges align perfectly. When tiled horizontally and vertically, no seam line or color jump should appear. Repeat errors cause waste in home textile, fashion fabric and wallpaper RIP workflows.

How is the seamless score calculated?

The tool compares left–right and top–bottom edge pixels and derives a 0–100 score from average RGB difference. Scores 80+ are generally acceptable for repeat print. 60–79 may need edge work; below 60 indicates visible seam risk.

What does the 4×4 tile preview show?

It repeats your single tile sixteen times so you can visually confirm repeat quality. Even with a high score, large motifs or gradient edges may show lines in the grid — use both score and visual check.

Which file formats are supported?

You can upload PNG, JPG or TIFF up to 10 MB. Analysis runs entirely in your browser; images are not sent to a server.

Is this seamless checker free?

Yes. The seamless checker is free. AI pattern generation, upscale, vectorization and mockups require a Sapphire account and credits.