Convert OpenType (OTF) to WOFF2 Online Free
Convert OpenType fonts to WOFF2 for the best possible web font compression. WOFF2 uses Brotli encoding to deliver smaller files than WOFF while preserving every OpenType layout feature, ligature, and glyph in your font.
To convert OTF to WOFF2, drop your .otf file onto the ChangeThisFile converter. The font is processed in your browser using opentype.js with Brotli compression — no upload needed. WOFF2 preserves all CFF outlines and OpenType features while delivering the smallest web font file size. Free and fully private.
Convert OpenType (OTF) to WOFF2
Drop your OpenType (OTF) file here to convert it instantly
Drag & drop your .otf file here, or click to browse
Convert to WOFF2 instantly
OpenType (OTF) vs WOFF2: Format Comparison
Key differences between the two formats
| Feature | OpenType (OTF) | WOFF2 |
|---|---|---|
| Compression | None (raw CFF data) | Brotli (best font compression available) |
| Typical file size | 100% (baseline) | ~35-55% of original OTF size |
| Browser support | Partial via @font-face | Chrome, Firefox, Safari, Edge (95%+) |
| OpenType features | Full support | All features preserved losslessly |
| Primary use | Design software and print | Modern web font delivery |
| CFF outlines | Native CFF (cubic Bezier) | CFF data preserved in WOFF2 container |
| Spec authority | Microsoft/Adobe specification | W3C Recommendation (2018) |
When to Convert
Common scenarios where this conversion is useful
Shipping the smallest possible web fonts
WOFF2 with Brotli compression produces smaller font files than any other format. Converting your OTF fonts to WOFF2 minimizes download size and improves page load speed.
Deploying professional typefaces to the web
Professional OTF fonts from foundries often include extensive OpenType features. WOFF2 preserves all of them while making the files web-ready.
Improving Core Web Vitals scores
Fonts directly affect Largest Contentful Paint. Switching from raw OTF to WOFF2 can shave significant milliseconds off font loading time, improving LCP metrics.
Building a font stack for modern web apps
Modern web applications should serve WOFF2 as the primary web font format. Convert your OTF source files to WOFF2 for React, Vue, Angular, or any web framework.
Reducing CDN bandwidth costs
For high-traffic sites, smaller font files translate directly to lower CDN bills. WOFF2 can be 50-65% smaller than raw OTF, reducing bandwidth for every page view.
How to Convert OpenType (OTF) to WOFF2
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1
Drop your OTF file
Drag and drop your .otf font file onto the converter, or click to browse. Both CFF-based and TrueType-based OpenType fonts are accepted.
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2
Instant conversion
Your font is parsed and compressed with Brotli encoding in the browser. CFF outlines, OpenType layout tables, kerning, and all typographic features are preserved.
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3
Download your WOFF2 file
Click Download to save the compressed .woff2 file. Reference it in your CSS with src: url('font.woff2') format('woff2') for optimal web delivery.
Frequently Asked Questions
WOFF2 typically reduces OTF file size by 45-65%. CFF-based OpenType fonts often compress particularly well with Brotli, sometimes achieving even better ratios than TrueType-based fonts.
Yes. Every GSUB and GPOS feature — ligatures, contextual alternates, stylistic sets, small caps, fractions — is preserved losslessly. You can access them via CSS font-feature-settings.
WOFF2 is supported in Chrome 36+, Firefox 39+, Safari 12+, Edge 14+, and Opera 23+. This covers over 95% of global users. Only Internet Explorer and very old browsers lack support.
Yes. CFF (Compact Font Format) outlines are preserved exactly inside the WOFF2 container. The cubic Bezier curves render identically to the original OTF in all supporting browsers.
If you need to support Internet Explorer 11 or older mobile browsers, include WOFF as a fallback. For modern-only sites, WOFF2 alone provides sufficient coverage.
No. Format conversion does not change license terms. Ensure your original OTF license permits web embedding before serving the font on a website, regardless of format.
Completely. The conversion happens in your browser using JavaScript. No font data is transmitted to any server. This is safe for proprietary, licensed, and unreleased typefaces.
Yes. Variable font tables including fvar, gvar, avar, and STAT are preserved. The resulting WOFF2 file supports the same variation axes and named instances.
WOFF2 uses Brotli compression with a font-specific preprocessing step that transforms font data into a more compressible form before compression. WOFF uses standard zlib, which lacks this font-aware optimization.
List WOFF2 first in the src: src: url('font.woff2') format('woff2'), url('font.woff') format('woff'). Browsers try sources in order and use the first supported format.
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