(Before operation) Reduce opacity

`Ctrl` + `[`

All hotkeys for Clip Studio Paint Pro

Frequently used shortcuts Switch to previous sub tool	`,`
Frequently used shortcuts Switch to next sub tool	`.`
Frequently used shortcuts Hand	`Space`
Frequently used shortcuts Rotate	`↑ Shift` + `Space`
Frequently used shortcuts Zoom (scale up)	`Ctrl` + `Space`
Frequently used shortcuts (macOS) Zoom (scale up)	`Space` then `⌘ Cmd`
Frequently used shortcuts Zoom (scale down)	`Alt` + `Space`
Frequently used shortcuts Switch main color and sub color	`X`
Frequently used shortcuts Switch drawing color and transparent color	`C`
Frequently used shortcuts Select layer	`Ctrl` + `↑ Shift`
Tool Zoom	`/`
Tool Move (Hand)	`H`
Tool Move (Rotate)	`R`
Tool Operation (Object)	`O`
Tool Operation (Select layer)	`D`
Tool Operations (Edit timeline)	`L`
Tool Move layer	`K`
Tool Selection	`M`
Tool Auto select	`W`
Tool Eyedropper	`I`
Tool Pencil	`P`
Tool Decoration	`B`
Tool Eraser	`E`
Tool Blend	`J`
Tool Gradient	`G`
Tool Ruler [PRO/EX]	`U`
Tool Balloon [PRO/EX]	`T`
Tool Correct line/Remove dust [PRO/EX]	`Y`
Menu Preferences [macOS/iPad]	`⌘ Cmd` + `K`
Menu Shortcut settings [macOS/iPad]	`⌥ Option` + `↑ Shift` + `⌘ Cmd` + `K`
Menu Modifier key settings [macOS/iPad] [PRO/EX]	`⌥ Option` + `↑ Shift` + `⌘ Cmd` + `Y`
Menu Quit CLIP STUDIO PAINT [macOS]	`⌘ Cmd` + `Q`
File menu New	`Ctrl` + `N`
File menu Open	`Ctrl` + `O`
File menu Close	`Ctrl` + `W`
File menu Save	`Ctrl` + `S`
File menu Save as	`↑ Shift` + `Alt` + `S`
File menu Save as	`Ctrl` + `↑ Shift` + `S`
File menu Save as	`Ctrl` + `Alt` + `S`
File menu Print	`Ctrl` + `P`
File menu Preferences [Windows]	`Ctrl` + `K`
File menu Shortcut settings [Windows]	`Ctrl` + `↑ Shift` + `Alt` + `K`
File menu Modifier Key Settings [Windows] [PRO/EX]	`Ctrl` + `↑ Shift` + `Alt` + `Y`
File menu Quit CLIP STUDIO PAINT [Windows]	`Ctrl` + `Q`
Edit menu Undo	`Ctrl` + `Z`
Edit menu Redo	`Ctrl` + `Y`
Edit menu Redo	`Ctrl` + `↑ Shift` + `Z`
Edit menu Cut	`Ctrl` + `X`
Edit menu Cut	`F2`
Edit menu Copy	`Ctrl` + `C`
Edit menu Copy	`F3`
Edit menu Paste	`Ctrl` + `V`
Edit menu Paste	`F4`
Shortcuts used during operation Cancel a last point	`Del`
Edit menu Clear	`⬅ Backspace`
Edit menu Clear	`Ctrl` + `Del`
Edit menu Clear	`Ctrl` + `⬅ Backspace`
Edit menu Fill	`Shfit` + `Del`
Edit menu Fill	`↑ Shift` + `⬅ Backspace`
Edit menu Tonal correction: Hue/Saturation/Luminosity	`Ctrl` + `U`
Edit menu Reverse gradient [PRO/EX]	`Ctrl` + `I`
Edit menu Transform: Scale up/Scale down/Rotate	`Ctrl` + `T`
Edit menu Transform: Free transform	`Ctrl` + `↑ Shift` + `T`
Layer menu New raster layer	`Ctrl` + `↑ Shift` + `N`
Layer menu Layer settings: Clip at layer below	`Ctrl` + `Alt` + `G`
Layer menu Merge with layer below	`Ctrl` + `E`
Layer menu Combine Selected Layer	`↑ Shift` + `Alt` + `E`
Layer menu Combine showing layer	`Ctrl` + `↑ Shift` + `E`
Layer menu Change selected layer [PRO/EX]: Layer Above	`Alt` + `]`
Layer menu Change selected layer [PRO/EX]: Layer Below	`Alt` + `[`
Selection menu Select All	`Ctrl` + `A`
Selection menu Deselect	`Ctrl` + `D`
Selection menu Reselect	`Ctrl` + `↑ Shift` + `D`
Selection menu Invert selected area	`Ctrl` + `↑ Shift` + `I`
Selection menu Invert selected area	`↑ Shift` + `F7`
View menu Zoom out	`Ctrl` + `Num 1` - `Num 9` + `,`
View menu Zoom in	`Ctrl` + `;`
View menu Zoom out	`Ctrl` + `-`
View menu 100%	`Ctrl` + `Alt` + `0`
View menu Fit to screen	`Ctrl` + `0`
View menu Reset display	`Ctrl` + `@`
View menu Ruler [PRO/EX]	`Ctrl` + `R`
View menu Snap to Ruler [PRO/EX]	`Ctrl` + `1`
View menu Snap to Special Ruler [PRO/EX]	`Ctrl` + `2`
View menu Snap to Grid [PRO/EX]	`Ctrl` + `3`
View menu Change Special Ruler Snap [PRO/EX]	`Ctrl` + `4`
Window menu Canvas: Next canvas	`Ctrl` + `⭾ Tab`
Window menu Canvas: Previous canvas	`Ctrl` + `↑ Shift` + `⭾ Tab`
Window menu (macOS) Canvas: Next canvas	`Control` + `⭾ Tab`
Window menu (macOS) Canvas: Previous canvas	`Control` + `↑ Shift` + `⭾ Tab`
Window menu Show/Hide All Palettes	`⭾ Tab`
Window menu Hide Title Bar/Hide Menu Bar	`↑ Shift` + `⭾ Tab`
Help menu CLIP STUDIO PAINT Manual	`F1`
Shortcuts used during operation (on the 3D material) Select part	`Mouse left click`
Shortcuts used during operation Scale down	`Alt` + `Mouse left click`
Shortcuts used during operation (During move) Fix translation direction	`↑ Shift`
Shortcuts used during operation (During free transform) Scale up/down with reference to the center of rotation	`Alt`
Shortcuts used during operation (on other than 3D material) Move camera	`Mouse movement`
Shortcuts used during operation Cancel a last point	`Mouse right click`
Shortcuts used during operation Move camera back and forth	`Mouse movement`
Shortcuts used during operation Go to previous frame	`←`
Shortcuts used during operation Go to next frame	`→`
Shortcuts used during operation Go to previous cel	`↑ Shift` + `←`
Shortcuts used during operation Go to next cel	`↑ Shift` + `→`
Shortcuts used during operation Go to track above	`↑`
Shortcuts used during operation Go to track below	`↓`
Shortcuts used during operation Fix	`⤶ Enter`
Shortcuts used during operation Duplicate Layer	`Alt` + `Mouse movement`
Shortcuts used during operation Interlock selection and image	`Ctrl` + `Mouse movement`
Shortcuts used during operation (Before operation) Select from current selection	`↑ Shift` + `Alt`
Shortcuts used during operation Make (brush size) thicker	`]`
Shortcuts used during operation (Before operation) Make (brush size) thinner	`[`
Shortcuts used during operation (Before operation) Change brush size	`Ctrl` + `Alt` + `Mouse movement`
Shortcuts used during operation Enable/disable multiple referring	`0`
Shortcuts used during operation Fix	`Mouse double click`
Shortcuts used during operation Cancel	`Esc`
Shortcuts used during operation (During free transform) Scale up/Scale down/Rotate	`Ctrl`
Shortcuts used during operation (Before operation) Increase opacity	`Ctrl` + `]`
Shortcuts used during operation (Before operation) Reduce opacity	`Ctrl` + `[`
Shortcuts used during operation click Cancel a last point	`Del/→`