Picture Watermark Studio

Picture Watermark Studio is a native GTK 4 application for adding text or
image watermarks to one photo or a whole batch.

Features:
- Text watermarks with font, colour, opacity, outline, shadow, rotation and
line spacing
- Logo and image watermarks with adjustable size and opacity
- Nine placement presets plus drag-to-place positioning on a live preview
- Tiled watermark mode
- Batch export as JPEG, PNG or WebP with quality control
- Preserves EXIF, ICC profile and DPI metadata where possible
- Drag and drop, keyboard shortcuts and a clean GNOME-style interface

Picture Watermark Studio never overwrites your originals.