Raster bitmaps (Portable Network Graphics ("PNG")) with full-color and alpha transparency (32bpp RGBA) supported.
Stamps can be resized, flipped and mirrored.
Stamps can have descriptive text and sound samples (names, facts, etc.) and/or sound effects assigned to them.
Parents/teachers can add more stamps and create categories.
Hundreds of photographic and cartoon stamps images are available.
Color mixer, for combining primary colors together (New in 0.9.28).
Keyboard shortcut for quickly invoking the color picker (New in 0.9.28).
Color picker, for choosing colors from a drawing.
Alternate color palettes can be created and used.
Brush spacing can be adjusted (New in 0.9.28).
Brushes can point the direction that's being drawn.
Brushes can change shape depending on the direction they're drawn.
A cartoon version of Tux, the Linux penguin, appears at the bottom to give tips, hints and information.
Fun sound effects are played when tools are selected and used.
Images can be exported from Tux Paint (e.g., to your "Pictures" folder).
Loading and saving of images is done using thumbnails, so no knowledge of the underlying operating system's filesystem structure is needed.
(It defaults to 800圆00 mode, but can run at larger sizes and in portrait or landscape mode, as well.)
The entire program fits on a screen as small as 640x480, and can be displayed full-screen, to hide the computer's underlying 'desktop' interface.
The drawing canvas is a fixed size, so the user doesn't need to worry about 'pixels' or 'inches' when making a new picture.
A number of useful drawing tools are made available.
An unofficial Apple iOS (iPhone/iPad) version is also available. Tux Paint works on macOS (10.10 Yosemite and up), Windows (Windows 7 through Windows 11), Linux, Android, and other systems.