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Drop one PSD or two hundred. Batch conversion is not a paid feature here.
A working Photoshop file needs to become something a client, a printer or an upload form will accept, and it is currently hundreds of megabytes.
The composite is flattened and JPEG-compressed. The size drop is dramatic, because a PSD stores every layer, every mask and often a full-size preview alongside them.
A PSD saved in CMYK converts to RGB on the way to JPEG, and saturated cyans and oranges shift visibly. If the file is going to print, ask for a press-ready PDF or TIFF rather than a JPEG.
It is storing the whole editable document: every layer at full size, masks, history metadata and a flattened preview. The JPEG stores one flattened image.
They are filled with white. JPEG has no alpha channel.
Drop one PSD or two hundred. Batch conversion is not a paid feature here.
JPEG Image is lossy, so the quality control decides the trade between size and fidelity.
Converted and deleted the moment it finishes. Never written to permanent storage.