Web Open Font Format (.WOFF)

Advantages of Web Open Font Format

What the WOFF format does well, and why you might choose it.

• Significantly smaller file sizes than TTF/OTF for faster web page loading
• Standardized by the W3C with universal browser support
• Includes metadata for licensing and font origin information

Limitations of Web Open Font Format

What the WOFFformat doesn't do well, and when to choose another format.

• Larger than WOFF2 which uses more efficient Brotli compression
• Not intended for desktop application use
• Requires decompression overhead when loading fonts

What WOFF files are used for

• Web font delivery via CSS @font-face rules
• Self-hosted web typography on websites and web applications
• Font distribution through web font services

How WOFF files work

Font files contain glyph outlines (the shapes of letters, numbers, and symbols) plus metadata about kerning, hinting, OpenType features (small caps, ligatures, alternates), and Unicode coverage. TrueType (TTF) and OpenType (OTF) are the desktop standards; WOFF and WOFF2 are compressed wrappers around the same data, designed specifically for web delivery. WOFF2 typically halves the on-the-wire file size versus TTF/OTF without affecting rendered quality. Variable fonts pack multiple weights and widths into a single file using axes (weight, width, optical size), saving bandwidth when a site uses many variants of one typeface.

Best practices when working with WOFF

Self-host web fonts in WOFF2 with a TTF or WOFF fallback for older browsers. Subset to the actual character set the site uses — a font with full Unicode coverage is 5-10× larger than one subset to Latin Extended. Use font-display: swap or font-display: optional in CSS to avoid invisible text while fonts load. Check the license before deploying — many fonts are licensed for desktop use only, or for a limited number of pageviews per month. Variable fonts collapse a 6-weight type family from six files into one, dramatically reducing total bandwidth.

Convert to WOFF

The most common formats people convert to WOFF, ready to convert in seconds.

Convert WOFF to other formats

Convert Web Open Font Format files into the format you actually need.

Choosing WOFF versus the alternatives

WOFF2: web deployment, modern browsers (every browser of the last 7+ years). WOFF: web deployment with broader legacy browser support. TTF: desktop installation, design tools, print workflows. OTF: same as TTF but with extended OpenType features (small caps, alternates) — often the original release format from foundries. EOT: a Microsoft web format only relevant for IE8 and below; effectively dead in 2026.

Where WOFF fits in real workflows

Font workflows are about getting the same typeface to render identically across desktop design tools, web browsers, and document deliverables. Convert TTF/OTF originals to WOFF2 for web delivery, embed fonts in PDFs so they survive printing, and keep the original TTF/OTF as your master for desktop apps that don't accept compressed web variants.

Privacy and file handling

When you convert a WOFFfile with MegaConvert, the file is uploaded to our converter, processed, and automatically deleted within an hour. We don't train models on your files, share them with third parties, or retain them after the conversion completes. The download link expires when the file is removed. If your work involves files subject to NDA or compliance requirements (HIPAA, GDPR data processing), please review our privacy policy before uploading sensitive material.

Frequently asked questions about WOFF