mtPaint (short for Mark Tyler's Painting Program) is a free and open-source raster graphics editor for creating icons, pixel art and for photo editing.

[3][4] mtPaint was originally written by Mark Tyler specifically for Linux operating systems, as a personal project for his own use.

Other design goals included that it be fast, reliable and free software under the GNU General Public License to protect user freedom.

These include:[10] mtPaint supports BMP, GIF, JPEG, LSS, PNG, TGA, TIFF, XPM and XBM formats for both loading and saving images.

"[13] Reviewer Seth Kenlon praised mtPaint in 2017, writing, "what makes mtPaint great is that it specializes in pixel art, has a tiny footprint—the application is about 391k, compiled (assuming Gtk is installed separately)—and it is designed to run efficiently on specs as low as 200MHz CPU with 16MB of available RAM.

"[14] Linux Experten noted, "due to its efficient design, it can run on older PC hardware (such as a 200mhz cpu and 32mb frame).

[16] A 2017 review by Martins D. Okoi for FOSSMint noted the infrequent releases of mtPaint, but praised its small memory footprint and advanced features.