How to make a tkinter Label background transparent?

i think it can help, all black will be transparent

root.wm_attributes('-transparentcolor','black')

It is not supported with transparent backgrounds in Tk.

If you are working with images and putting text onto them, the most convenient way is - I think - utilizing Canvas widget.

tkinter Canvas widget has methods as .create_image(x, y, image=image, options) and .create_text(x, y, text="Some text", options).

use this :

from tkinter import *

main=Tk()
photo=PhotoImage(file='test.png')
Label(main,image=photo,bg='grey').pack()
#your other label or button or ...
main.wm_attributes("-transparentcolor", 'grey')
main.mainloop()

this work if use bg='grey' you can change it in line 7

good luck :)