Original spritesheet

Aligned spritesheet

Animation preview

Settings

Alpha threshold12

Keep cell padding0

Sampling bleed24

Playback FPS8

Show detection boxes & anchors ?

Detect shape

Per-row align ?

Shared impact point (cross-row) ?

Auto-expand cells to avoid clipping

Keep only each cell’s subject, avoiding neighbors

Edit source frames ?

Edit mask

Mask cells

Fix for

Repack margin

How to use:
1. Drop in a spritesheet.
2. Set columns and rows, e.g. 4x2.
3. If the effect is cut by grid lines, raise "Sampling bleed".
4. Click "Analyze cells" to see each cell’s subject box.
5. If the rows are slash-into-explosion, turn on "Shared impact point".
6. Click "Auto-Align".
7. Play to confirm it no longer drifts, then export.

Transparent-background assets work best. Dark-background assets work too, but with lower accuracy.