Private browser instrument

Read the seam before it repeats.

Drop a PNG, JPEG or WebP. The image stays in this browser while the instrument compares opposite edges, gradients, corners and interior texture.

Load a local tile

No upload. No account. No server copy.

Load a tile to begin the edge scan.

Zoom Repeats Seam guides

Diagnostic guidance only: always inspect the final production file at its intended scale.