Autotrace Background Images
If you want to create a font form your own handwriting and don't want to trace the letters manually is autotrace a good option. Birdfont can automatically convert the raster images to vector graphics. Manual tracing gives you more control over the process but you can achieve equally good result by autotracing the image and adjusting the shape of the letter afterwards.
Select the desired control point type. Cubic control points (the number 3 option) are easiest to use but TTF fonts can only contain quadratic (the number 2 or 2×2 option). Cubic control points will be converted to the quadratic form when you export the font but the conversion is not lossless.
Select the background tool and click on the B icon to insert a new background images.
Crop the background image and move it in to the letter box.
Make the image black and white and adjust the threshold value.
Click on autotrace to convert the image to a glyph in your vector font. The process typically takes between one and five minutes.