Loop Tools

Loop Tools is an After Effects script that lets you define a “loop window” with markers and then keep animating after the stop with no offsets or snaps. Perfect loops where you want them—and full control afterward.

Loop Tools creates clean loops between LOOP_START and LOOP_END, cuts at LOOP_STOP, and from there lets you move the object freely without breaking the center or dragging offsets. You can also re-bake the stop if you move the marker and even set up multiple loop windows at different points in the timeline.

Loop Tools for After Effects is a utility set for precise, flexible looping:

• Marker-based loop window: LOOP_START, LOOP_END, LOOP_STOP.
• Clean exit from the loop: bakes a keyframe at STOP + 1 frame so you can animate beyond the loop with no offsets or “snaps.”
• Smart re-bake: if you move LOOP_STOP (or NEW_START), quickly re-bake the exit keyframe.
• Auto-prefill: detects selected keys to prefill Start/End and uses the playhead for Stop.
• Respects your animation: only touches properties that already have keyframes.

Great for: motion loops, UI micro-interactions, character cycles—any animation that needs clean, repeatable motion without losing creative control afterward.

Installation (After Effects)

1. Open After Effects.
2. Go to File → Scripts → Install Script File…
3. Select the .jsx file (e.g., AE_MarkerLoopWindow_BAKESTOP_v1_9.jsx).
4. Restart After Effects.
5. Run it from File → Scripts → Loop Tools.
   (Quick test without installing: File → Scripts → Run Script File…)