Remove a Double Chin in Photoshop (Generative Fill, Quick Mask)
You’ll quickly paint a selection with Quick Mask, invert it, and let Generative Fill remove the unwanted area under the jaw. The workflow is fast, repeatable, and delivers multiple variations to choose from. Use it for subtle refinements from any angle.

Step-by-step instructions
Paint the target area with Quick Mask
Zoom in on the chin/jaw area.
Press Q to enter Quick Mask and press B for the Brush Tool.
Set Brush Flow to 100% and size the brush appropriately.
Paint along the jawline and slightly under the chin where you want reduction.
Turn the paint into a selection
Press Q to exit Quick Mask and convert the painted area into a selection overlay.
Press Ctrl/Command+Shift+I to invert the selection (so the area under the chin is targeted for fill).
Run Generative Fill
Click the Generative Fill button (Contextual Task Bar) or go to the Generative Fill panel.
Type: remove (or leave blank for a context-aware result) and click Generate.
Review the three variations and pick the most natural result.
Repeat as needed for other angles
If the double chin appears on the left, right, or center, repeat the same Quick Mask → Invert → Generative Fill steps for each area.
Zoom out to review symmetry and touch up with additional small passes if necessary.