OTF to WOFF Converter - Free Online Tool

Convert OTF to WOFF online instantly - free, no signup. Convert OpenType font files to WOFF format for web use. zlib-compressed, ~20-30% smaller, kerning & OpenType preserved. Works in IE9+.

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Convert otf to woff

otfwoff

Drop your OTF file here

or browse files · Max 10 MB

.otf

What happens when you convert OTF to WOFF?

An OTF is a desktop format. The glyph outlines, the OpenType feature tables, the full character set, all of it is identical to what the web consumes, but it is stored uncompressed because a desktop install pays no HTTP cost for it.

A browser does. WOFF, introduced in 2009 and made a W3C Recommendation in 2012, is a compressed wrapper around that exact data: the same glyphs and the same OpenType features, repackaged with zlib compression and a small metadata block so a browser can load it directly through @font-face.

This wrapping does not touch the outlines. An OTF most often carries PostScript (CFF) curves, and WOFF preserves them as they are rather than redrawing them, which makes the conversion lossless: the rendered output is the same shape on screen, with every kerning pair and OpenType feature intact.

The split is simple. The OTF stays on the desktop as the editable source; the WOFF goes to the server as a web-deliverable file that every browser in current use, and many long out of date, can read.

When to convert OTF to WOFF instead of WOFF2?

WOFF and WOFF2 are both compressed web font formats built around the same OpenType data; the difference is the compression and the reach. WOFF uses zlib. WOFF2, the newer format, uses Brotli plus a glyph-aware transform and lands about 30% smaller again, but it only reaches browsers from roughly 2014 onward.

WOFF has no such cutoff. It is supported in every browser back to Internet Explorer 9, which is exactly why it still has a job.

That job is fallback. For almost every modern site, WOFF2 is the format to lead with. WOFF earns its place as the second file in the stack: declare WOFF2 first and WOFF second in the same @font-face rule, and a current browser takes the smaller WOFF2 while an older one that cannot decode Brotli falls back to the WOFF.

That belt-and-braces pairing is the main reason to generate a WOFF at all in 2026 — legacy corporate stacks, kiosk systems, and embedded browsers that predate WOFF2 support.

OTF (Input)	WOFF (Output)
Uncompressed OpenType (often CFF)	zlib-compressed wrapper
Desktop install format	Web delivery format
Baseline file size	~20–30% smaller
Renders on desktop, not optimized for HTTP	All browsers, including IE9+
Editable in Figma, Illustrator, font editors	99%+ global browser coverage
Variable axes supported	Variable axes preserved

From OTF upload to a deployed WOFF @font-face

Three steps move a font from desktop OTF to live WOFF webfont:

Upload the OTF file — Drop the file on the converter or browse to it.
Conversion runs server-side — zlib compression is applied while the CFF outlines, kerning tables, OpenType features, ligatures, stylistic alternates, and variable axes are preserved exactly. The OTF is removed from the server once the WOFF is delivered.
Download the WOFF and wire it in — A generated @font-face snippet comes with the file, ready to paste into a stylesheet.

Because WOFF is most useful as a fallback, the safe declaration pairs it with WOFF2:

@font-face {
  font-family: 'Your Font';
  src: url('/fonts/your-font.woff2') format('woff2'),
       url('/fonts/your-font.woff') format('woff');
  font-weight: 400;
  font-style: normal;
  font-display: swap;
}

The format() hints let a browser skip any file it cannot decode, so a WOFF2-capable browser never requests the WOFF, while an older one drops straight to it. font-display: swap shows a fallback face while the webfont loads, which keeps text visible during the request and holds layout shift down.

Frequently asked questions

Is the OTF to WOFF converter free?

Yes. It runs without an account, with no signup, paywall, or cap on the number of conversions.

Should I convert OTF to WOFF or to WOFF2?

For most modern sites, lead with WOFF2 and use WOFF only as a fallback. WOFF2 is smaller and covers 97%+ of traffic, but it does not reach browsers older than around 2014. WOFF reaches everything back to Internet Explorer 9, so converting to WOFF gives you the file that keeps a legacy or embedded browser covered.

Will kerning and OpenType features survive when I convert OTF to WOFF?

They do. WOFF is a wrapper around the same OpenType data the source OTF already contains, including its CFF outlines, so kerning pairs, ligatures, stylistic alternates, and language features all carry through. The conversion is lossless and the rendered WOFF is identical to the source OTF.

Does the OTF to WOFF converter handle variable fonts?

Yes. Variable axes are preserved in the WOFF output, including weight, width, slant, optical size, and any custom axes. That said, if variable fonts are the priority, WOFF2 is the better-suited delivery format.

Which browsers support WOFF?

Every current browser supports WOFF, and so do older ones going back to Internet Explorer 9 — broader reach than WOFF2, which is the whole reason WOFF still gets used as a fallback.

Is there a file size limit for the OTF?

Our online font converter accepts an OTF up to 10 MB, which covers nearly every desktop font. Very large CJK or Indic families with extensive glyph sets take a moment longer to process but generally complete without issue.