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How to Convert WOFF to WOFF2
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When Do You Need to Convert WOFF to WOFF2?
WOFF2 replaced WOFF and compresses considerably better. Converting WOFF to WOFF2 is a straightforward way to reduce font payload on a site that is still serving the older format, with no visual change at all.
What Happens When You Convert WOFF to WOFF2
FontForge unpacks the WOFF and repacks the same font data as WOFF2. The difference between the two is purely the compression: WOFF uses zlib and WOFF2 uses Brotli tuned for fonts, which typically produces a file 20 to 30 percent smaller again. Outlines, hinting, kerning and OpenType features are untouched, so rendering is identical. Browser support for WOFF2 is now effectively universal, which is what makes keeping WOFF unnecessary for most sites.
Worth knowing before you convert
If the WOFF was already subset for a previous site, the WOFF2 inherits that same limited character set.
About WOFF and WOFF2
font/woff
Font format for web pages.
font/woff2
WOFF2 is the modern web font format optimized for fast loading and efficient compression. It reduces font file size significantly compared to TTF and OTF, improving website performance. WOFF2 is supported by all modern browsers.
Conversion Notes
Font conversion between WOFF and WOFF2 preserves all glyph outlines, kerning pairs, and most OpenType layout features. Hinting data — instructions that improve screen rendering at small sizes — may be recalculated or removed depending on the target format. Advanced features like variable font axes or color font layers are preserved only if the target format supports them.
Frequently Asked Questions
Typically 20 to 30 percent, on top of the compression WOFF already applied.