How to fix Cyrillic text rendering in jsPDF by embedding a Unicode font

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A developer encountered broken or missing Cyrillic characters while building a bilingual invoicing app using jsPDF, which only ships with standard Latin fonts like Helvetica and Courier. The root cause is that these built-in fonts lack Cyrillic glyphs, making them unable to render languages like Bulgarian. The recommended fix is to embed a Unicode font — specifically DejaVu Sans — by converting the TTF file to a base64 string and registering it with jsPDF using the addFileToVFS and addFont methods. Developers must register both the regular and bold font weights separately, as missing the bold variant causes jsPDF to silently fall back to a broken font. This approach produces clean, professional PDFs in multiple scripts without resorting to transliteration workarounds.

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