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Clipboard History Switcher
The Clipboard History Switcher is in essence a Clipboard Manager. Whenever you copy something from any app, the Keyboard Maestro Engine saves a copy of the System Clipboard at that time to the Clipboard History file.
The Clipboard History Switcher (CHS) allows you to:
Save a copy of the System Clipboard every time you make a copy from anywhere.
Paste any previous saved clipboard in your History
View all of the Clipboards in your History
Perform special operations before you paste, like convert to plain text
Merge multiple Clipboards into one new Clipboard
Paste multiple Clipboards with a user-selected delimiter
Trigger Your Custom Macros to operate on the selected Clipboard.
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A typical display of the Clipboard History Switcher looks like this:
How To Use
Display the CHS
The Clipboard History Switcher is displayed using the Activate Clipboard History Switcher Action. You can find a Macro that uses this Action in the Switcher Group Macro Group (which comes installed with Keyboard Maestro).
Pasting from the CHS
To Paste the Selected Clipboard as is, do any of these:
Double-Click on the Clipboard
Press RETURN or ENTER key
Click on the Paste button
Right-click on the Clipboard and select “Paste”
Drag Clipboard onto App document
Hold the Shift key while pressing return or double clicking to paste as plain text.
Most of these Toolbar buttons operate on the selected Clipboard. There are currently no keyboard shortcuts for these tools.
Information i button
Close CHS x button
Mark as Favorite Button
Search Box
Send Button
Send Selected Clipboard(s) via email??

Delete Button
This menu is available by either clicking on the Gear ⚙ Button on a Clipboard, or by right-clicking anywhere on a Clipboard.
Most of the these menu items are designed to operate on one or more Clipboards, and produce a new Clipboard, which can later be pasted if desired.
Navigate the CHS
Arrow Keys
You can press arrow keys to scroll through the clipboard entries
* Drag/Drop Clipboards
You can also drag Clipboards to a new location in the History
If it becomes the first Clipboard, then it will replace the current System Clipboard
Drag text and images out from the clipboard switcher to other applications.
Operating on Multiple Clipboards
Select two or more Clipboards (using standard macOS multiselection), and then you can:
Paste them as a single unit, or
Press ⌘C to merge them to the System Clipboard.
The Gear ⚙ menu includes a selection for the separator to include between each item when pasting multiple entires. If multiple images are selected, merging them creates a single larger image (horizontally or vertically, depending on the separator).
Other Operations
Passwords – Clipboard entries that resemble passwords are obscured, deleted after they reach position ten in the clipboard history, and not saved to disk. You can option click on an obscured password to reveal it.
Send to another Mac
You can send clipboards to another Mac running Keyboard Maestro.
* Switch Between Normal Clipboard History and Named Clipboard Switchers
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Preferences
Excluding Clipboards from Selected Apps
Keyboard Maestro keeps a copy of everything you copy automatically each time you copy something. You can exclude certain applications (for example, badly behaved applications or applications that often have very large clipboards) using the Preferences > Excluded Preferences Panel in the Keyboard Maestro Editor app.
Hidden Preferences
The default Maximum Number of Items stored in the Clipboard History is 200.
This along with several other features may be changed with the Hidden Clipboard Preferences
By default, Keyboard Maestro creates a Clipboard History Switcher macro in the “Switcher Group” Macro Group, triggered by Command-Control-Shift-V. You can disable the Macros by selecting them in the Macros window pane and clicking the ✓ button.
Keyboard Maestro also has many macros in the Macro Library, such as macros for Paste Plain Text (Command-Shift-V) and Paste Previous Clipboard (Command-Control-V).