Online Font Converter

With this free online font converter tool you can create C array from any TTF or WOFF. You can select ranges of Unicode characters and specify the bpp (bit-per-pixel).

The font converter is designed to be compatible with LVGL.

The offline version of the converter (as well as the source code for this website) is available here

Name

Size

Bpp

1 bit-per-pixel 2 bit-per-pixel 3 bit-per-pixel (Needs compression enabled) 4 bit-per-pixel 8 bit-per-pixel

Fallback

Enable Font compression (reduces size but results in slower rendering)

No subpixel hinting

Horizontal subpixel rendering (may improve font quality but results in larger fonts)

Vertical subpixel hinting

Try to use glyph color info from font to create grayscale icons.
Since gray tones are emulated via transparency, result will be good on contrast background only.

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TTF/WOFF file

Range

Symbols

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Include another font
You can use both "Range" and "Symbols" or only one of them

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Old version for v5.3

How to use the font converter?

1. Give name to the output font. E.g. "arial_40"
2. Specify the height in px
3. Set the bpp (bit-per-piel). Higher value results smoother (anti-aliased) font
4. Choose a TTF or WOFF font
5. Set a range of Unicode character to include in your font or list the characters in the Symbols field
6. Optionally choose another font too and specify the ranges and/or symbols for it as well. The characters will be merged into the final C file.
7. Click the Convert button to download the result C file.

How to use the generated fonts in LVGL?

1. Copy the result C file into your LVGL project
2. In a C file of your application declare the font as: extern const lv_font_t my_font_name; or simply LV_FONT_DECLARE(my_font_name);
3. Set the font in a style: style.text.font = &my_font_name;

Useful notes

• Unicode table to pick letters: https://unicode-table.com/
• Unicode ranges http://jrgraphix.net/research/unicode.php
• A pixel perfect font: Terminus.
• List of built-in symbols Use this FontAwesome symbol font and copy this list to Range:
  61441,61448,61451,61452,61452,61453,61457,61459,61461,61465,
  61468,61473,61478,61479,61480,61502,61512,61515,61516,61517,
  61521,61522,61523,61524,61543,61544,61550,61552,61553,61556,
  61559,61560,61561,61563,61587,61589,61636,61637,61639,61671,
  61674,61683,61724,61732,61787,61931,62016,62017,62018,62019,
  62020,62087,62099,62212,62189,62810,63426,63650
• To learn more about the font handling of LVGL read this Guide
• To use the Fonts without LVGL you need lv_font.c/h, lv_font_fmt_txt.c/h from here.

The Offline version of the converter is available on GitHub.