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Betaflight Boot Logo Replacer

This web app can create font files for the MAX7456 OSD chip with a customized boot logo image, which can be then uploaded to a compatible flight controller using the Betaflight Configurator. Requires Python 3.


Install requirements

Like always, just use pip to install dependencies on your system:

sudo pip3 install -r requirements.txt

Or even better, you may consider using a virtual environment.

Download OSD fonts

Fonts from the Betaflight project are not part of this repo, but are required by this app. Run to download them from Betaflight Configurator's repo.

Enable reCAPTCHA

This web app supports reCAPTCHA to repell robots and keep them from spamming. Once you have created an account at the official reCAPTCHA home page and registered your site, you can provide the site key and secret key to the app to enable the reCAPTCHA widget. Copy recaptcha.cfg.sample as recaptcha.cfg and edit the copied file to include the keys for your site.

Set up SSL

SSL is enabled by default, the required certificate (app.crt) and key (app.key) files can be created by running The --no-ssl command line option can be used to disable this.

Source image restrictions

The input image for the custom logo must satisfy these requirements:

  • image has to be exactly 288px×72px
  • the best to use PNG or BMP format
  • background must be full green (#00ff00)
  • must use white (#fff) and black (#000) colors only
  • it's better to use RGB mode than RGBA (alpha is ignored anyway)
  • green areas will be transparent on the OSD

Command-line usage

usage: [-h] [--no-ssl] [--no-recaptcha] [-p PORT] [-s ADDR] [-v] [-d]

optional arguments:
  -h, --help            show this help message and exit
  --no-ssl              disable SSL support (default: False)
  --no-recaptcha        disable reCAPTCHA (default: False)
  -p PORT, --port PORT  server port (default: 8720)
  -s ADDR, --host ADDR  host address (default:
  -v                    verbosity level, can be used multiple times (default:
  -d, --debug           enable debug mode and autoreload (default: False)
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