WOFF to WOFF2 Compressor

WOFF to WOFF2 conversion is the process of upgrading a Web Open Font Format (WOFF) file to the newer WOFF2 format for smaller file sizes and better browser support. WOFF uses zlib/DEFLATE compression internally, while WOFF2 uses Brotli compression — a more efficient algorithm that typically achieves 30% smaller file sizes than WOFF at the same font quality. WOFF2 is supported by all modern browsers (Chrome 36+, Firefox 39+, Safari 12+, Edge 14+) and is the recommended web font format for production use. Our woff to woff2 compressor uses a browser-based WASM encoder to perform the conversion entirely locally — your font file never leaves your device.

1. 1Upload your WOFF font file: Drag and drop or click to select any .woff font file. The file is validated against the WOFF magic number header before processing — no data is sent to any server.
2. 2Browser-based WASM conversion:Click "Convert to WOFF2" — the tool loads a WASM-compiled WOFF2 encoder, extracts the sfnt font tables from the WOFF wrapper, and re-encodes them using Brotli compression into the WOFF2 format. All processing happens locally in your browser.
3. 3Download the WOFF2 file: The results panel shows original WOFF size, output WOFF2 size, and size reduction percentage. Click the download button to save the converted font file with an .woff2 extension.

• Compression Algorithm: The internal compression changes from zlib/DEFLATE (WOFF) to Brotli (WOFF2) — Brotli achieves 20–30% better compression ratios for font data due to its larger context window and dictionary-based encoding.
• File Container Format: The WOFF wrapper header and table directory are replaced with the WOFF2 format structure, which includes a transformed table format for glyph data that further reduces file size.
• Font Data Integrity: All glyph outlines, kerning pairs, OpenType features, and metadata are preserved exactly — WOFF2 conversion is lossless with zero impact on font rendering quality.
• Browser Compatibility: The output WOFF2 file is supported by all modern browsers and can be used directly in CSS @font-face declarations with format('woff2').

After converting your font with our woff to woff2 compressor, use the output file in your CSS @font-face declaration. For maximum browser compatibility, serve both WOFF2 and WOFF formats — browsers will use WOFF2 when supported and fall back to WOFF for older browsers. Add font-display: swap to prevent render-blocking and improve Core Web Vitals. Example: @font-face {font-family: 'MyFont'; src: url('font.woff2') format('woff2'), url('font.woff') format('woff'); font-display: swap; }