Subset FontsPro
Subset embedded fonts to reduce PDF file size. Pro plan required. Secure and fast.
How to Subset Fonts
Upload your PDF
Fonts are analyzed for unused glyphs
Click 'Subset Fonts'
Download the optimized PDF
Frequently Asked Questions
1What is font subsetting?
Subsetting keeps only the characters used in the document, removing unused glyphs to save space.
2How much space does subsetting save?
A typical font has 65,000+ glyphs. If your document uses only 200 characters, subsetting removes 99% of font data.
3Will the document look different after subsetting?
No. All visible text renders identically. Only unused character data is removed from the embedded font files.
4Can I add text to a subsetted PDF later?
You can add text, but only characters present in the subset will render correctly. For full font availability, use the original un-subsetted version.
Why Use ZiaSign's Subset Fonts Tool?
ZiaSign's font subsetter removes unused character glyphs from embedded fonts, reducing PDF file size. If your PDF uses Arial but only 50 characters, the other 65,000+ glyphs are removed. Significant savings for font-heavy documents.
Also known as: subset pdf fonts · reduce pdf font size · remove unused font glyphs · optimize pdf fonts
How-to guide
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Step-by-step instructions to subset embedded fonts to reduce pdf file size with ZiaSign.
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