micropython-font-to-py
A Python utility to convert TTF, OTF, BDF, or PCF font files into Python source for use with MicroPython display drivers.
What is micropython-font-to-py?
micropython-font-to-py is a Python 3 utility that converts standard font files (TTF, OTF, BDF, PCF) into Python source code for use with MicroPython display drivers. It solves the problem of limited RAM on MicroPython devices by allowing fonts to be frozen as bytecode, reducing memory usage while maintaining fast rendering performance.
MicroPython developers working with displays (e.g., OLED, LCD) who need efficient font rendering on resource-constrained embedded systems.
Developers choose this tool because it provides an open-source, hardware-independent solution for font handling, supports frozen bytecode for minimal RAM usage, and works with a wide range of display drivers and font formats.
Overview
A Python 3 utility to convert fonts to Python source capable of being frozen as bytecode
Use Cases
Best For
- Embedded projects using MicroPython with OLED or LCD displays
- Reducing RAM usage for fonts on memory-constrained devices
- Converting scalable or bitmapped fonts to Python for frozen bytecode deployment
- Adding custom character sets or Unicode support to MicroPython displays
- Integrating icons into font files for GUI applications
- Optimizing font rendering for small displays with limited resources
Not Ideal For
- Projects using CircuitPython or other embedded Python variants outside MicroPython
- Applications requiring advanced typography features like kerning or ligatures
- Teams seeking plug-and-play font libraries without custom firmware compilation
- High-color or anti-aliased font rendering needs beyond monochrome bitmaps
Pros & Cons
Pros
Allows fonts to be frozen as bytecode, minimizing RAM consumption while maintaining fast access, as detailed in the introduction for memory-constrained MicroPython devices.
Works with any display driver subclassed from MicroPython's framebuffer or hardware frame buffers, ensuring broad compatibility across OLED, LCD, and other displays.
Converts TTF, OTF, BDF, and PCF fonts, including hand-designed bitmapped fonts for small sizes, as highlighted in sections 3 and 3.1 for optimized rendering.
Supports arbitrary Unicode characters and sparse character sets via command-line options, enabling non-English languages and custom icons without bloating the font file.
Cons
The README explicitly states that kerning is not supported, which can degrade text readability and professional appearance in proportional fonts.
Fonts are stored as one bit per pixel; colour must be added separately via the CWriter class, adding complexity for projects needing multi-colour or gradient text.
For optimal RAM usage with frozen bytecode, developers must build MicroPython firmware from source, increasing setup time and technical overhead compared to simpler import methods.
Frequently Asked Questions
Related Projects
writerA Python 3 utility to convert fonts to Python source capable of being frozen as bytecode
microfontText drawing library for MicroPython framebuffer
packed-fontMemory efficient MicroPython fonts for the Pico Pi and SSD1306 OLED Display
ssd1306bigA font for micropython on 128x64 pixel ssd1306 oled display.
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