Copy to clipboard - How to change default png format to a different one? #4830

This is platform-dependent in current Flameshot.

Linux and macOS

Enable Use JPG format for clipboard in General settings, or set it directly in flameshot.ini:

[General]
useJpgForClipboard=true
jpegQuality=75

You can locate/open the configuration through:

flameshot config

Restart the Flameshot process after editing the file. jpegQuality accepts 0–100; 75–85 is usually a reasonable range for screenshots intended for chat.

Windows

There is currently no supported Flameshot setting for this. The disabled control is intentional: the project forced clipboard output back to PNG on Windows in #4413 because JPEG clipboard data caused compatibility/paste failures. The current example configuration also labels useJpgForClipboard as unavailable on Windows.

saveAsFileExtension=.jpg is separate: it changes saved files, not the clipboard encoding. On Windows the reliable workaround is therefore to make JPG the default saved format and drag/upload that file:

[General]
saveAsFileExtension=.jpg
jpegQuality=75

That still involves a file, but it avoids manually converting PNG after each capture. For direct paste on Windows, Flameshot will remain PNG until the upstream compatibility problem is solved.

Also, HDR does not by itself make the clipboard PNG smaller; a detailed 4K capture can easily exceed Discord's limit because PNG is lossless. Cropping the selected area helps, but changing to JPEG is the meaningful size reduction where the platform supports it.

If this clarifies the available option for your OS, please mark it as the accepted answer so future users can find the platform distinction quickly.