TTF to WOFF Converter

TTF (TrueType Font) is the original desktop font format developed by Apple and Microsoft. WOFF (Web Open Font Format)is a web-specific container format standardized by the W3C that wraps TTF or OTF font data with a compact header and optional metadata. When you convert TTF to WOFF, the font's sfnt table structure is preserved exactly — WOFF is not a re-encoding but a repackaging. The WOFF container adds a 44-byte header and a per-table directory, making it immediately identifiable as a web font and enabling browsers to validate and cache it efficiently. Our ttf to woff converter implements the full WOFF 1.0 specification entirely in your browser.

1. 1Upload your TTF or OTF files: Drag and drop one or more font files onto the drop zone. The files are read as binary ArrayBuffers in your browser — no data is sent to any server.
2. 2Browser-based WOFF packaging:Click "Convert to WOFF". The converter reads the sfnt table directory, builds a WOFF header with the correct signature (wOFF), and writes each font table with its original checksum and length into the WOFF container.
3. 3Download your WOFF files: Single files download directly as.woff. Multiple files are packaged into a ZIP for batch download. Each file is named abacktools-[fontname].woff.

• TTF: Original desktop format. Supported everywhere but larger than WOFF/WOFF2. Use as a last-resort fallback in @font-face for very old browsers (IE8 and below).
• WOFF: Web-optimized container for TTF/OTF data. Supported by all browsers including IE9+. Typically 10–15% smaller than TTF due to header normalization. The standard fallback format in modern @font-face stacks.
• WOFF2: Upgraded format using Brotli compression — typically 30–50% smaller than TTF. Supported by all modern browsers (Chrome 36+, Firefox 39+, Safari 10+). Always use WOFF2 as the primary format with WOFF as fallback.
• Recommended @font-face stack: WOFF2 first, WOFF second, TTF third. This covers 100% of browsers from IE9 to the latest Chrome.

After you convert TTF to WOFF, use the file in a CSS @font-facedeclaration alongside your WOFF2 file. Place both font files in your project's /fonts/ directory and reference them with relative paths. The browser will automatically select the best format it supports — WOFF2 for modern browsers, WOFF for IE9–IE11. Serve WOFF files with the font/woff MIME type and set a long-lived Cache-Control header for optimal performance.