Open Textedit, type a suitable label or string of text. Set the font as you desire (cmd+t), go to “File -> Print” and choose “Open PDF in Preview”.
Now using the “Select Tool” select the text (draw a box around it) and press (cmd+k) to crop. Save the cropped PDF as a PNG image (File -> Save As)
Now with the saved PNG image, hold the mouse button on the select tool until the drop down menu appears, and choose “Instant Alpha”. The image will now let you select the background portions to remove. Click on each white area until they are all grey and then press “Enter”. Now, “File -> Save As” a PNG again, this time you will notice the “Alpha” tickbox is checked. Overwrite the existing PNG file.
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