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Remove unused characters from font files to reduce size by 50-90%. Upload a font, pick the character sets you need, download a smaller file. 100% in your browser.
Subset font files directly in your browser to strip out characters you do not need. Upload a TTF, OTF, or WOFF font, select Basic Latin, Extended Latin, or paste a custom character list, preview exactly which glyphs will be included, and download a smaller OTF file. No server uploads, no file size limits, no account required. Perfect for web developers optimizing Core Web Vitals, designers preparing custom web fonts, or anyone who needs a leaner font file.
Font subsetting creates a trimmed-down copy of a font file that only contains the glyphs (characters) you actually use. A typical professional font includes thousands of glyphs covering Latin, Cyrillic, Greek, Arabic, CJK, math symbols, dingbats, and more. If your website is in English, you only need around 95 of those characters. Subsetting removes everything else, producing a font file that is dramatically smaller — often 50-90% lighter than the original. The visual output is identical for the characters you kept; nothing changes except the file size.
Custom web fonts are one of the heaviest render-blocking resources on most websites. A single font weight can be 200-500 KB before subsetting. That delay directly impacts Largest Contentful Paint (LCP), Cumulative Layout Shift (CLS), and overall page speed. Subsetting a font to Basic Latin can reduce it to 15-40 KB — a savings that compounds when you load multiple weights or families. Google Fonts subsets automatically by language, but self-hosted fonts require manual subsetting. Smaller fonts also reduce bandwidth costs, improve mobile performance on slow connections, and contribute to better SEO rankings through Core Web Vitals.
The savings depend on how many glyphs the original font contains and which character sets you keep. Subsetting a large Unicode font (2,000+ glyphs) to just Basic Latin typically achieves 70-90% reduction. Adding Extended Latin for European language support still yields 50-80% savings. Even conservative subsetting — removing only CJK and obscure symbol blocks — delivers 40-60% reduction. Fonts with extensive OpenType features or hinting data see particularly large gains. As a rule of thumb: the more glyphs in the original, the bigger the benefit from subsetting.