Font and graphics editor for the QMK keyboard firmware. Live demo:

• https://joric.github.io/qle

QMK uses "classic" fixed-space Adafruit_GFX 1.0 bitmap font. There are two basic API calls in the latest QMK OLED Driver:

• oled_write_P(const char *string, bool invert) Writes zero-terminated string using default font (0x0A is line break)
• oled_write_raw_P(const char *data, uint16_t size) Writes string of characters in 0..255 range using data as 8x8 font

There are a few ways of adding a custom font to your keyboard (all they use local config files of the keymap):

• SRC in rules.mk: SRC += ./lib/glcdfont.c (crkbd)
• LOCAL_GLCDFONT in rules.mk: LOCAL_GLCDFONT = yes (gergo)
• OLED_FONT_H in config.h: #define OLED_FONT_H "keyboards/lily58/lib/glcdfont.c" (lily58)

The latest official way is redefining OLED_FONT_H in the config.h of your keymap (there also other settings):

• https://docs.qmk.fm/#/feature_oled_driver

• https://www.reddit.com/r/MechanicalKeyboards/comments/gjejxi/qmk_logo_editor
• https://www.reddit.com/r/olkb/comments/gk1her/qmk_logo_editor
• https://gist.github.com/joric/96b6a1a65eedc224b7d9d3d17bd4e9e8 (crkbd_logo_converter.py)
• https://helixfonteditor.netlify.app (Helix Font Editor by @teri_yakichan)
• https://docs.qmk.fm/#/feature_oled_driver?id=logo-example
• https://github.com/RustyJonez/OLED-ART-tinkering
• https://javl.github.io/image2cpp