Does converting OTF to WOFF reduce quality?

No, converting OTF to WOFF does not reduce quality. WOFF uses lossless compression, meaning the font outlines, glyphs, and visual appearance remain identical to the original. Only the file size changes.

What file size reduction should I expect?

You can expect a file size reduction of 40-60% when converting OTF to WOFF. For example, a 150KB OPENTYPE FONT file typically compresses to around 60-90KB as WOFF due to gzip compression.

Do WOFF fonts work in all browsers?

WOFF fonts work in all modern browsers and most older ones. Support includes Chrome 36+, Firefox 39+, Safari 5.1+, Edge (all versions), and Internet Explorer 9+.

Will my font's OpenType features work after conversion?

Yes, all OpenType features are preserved during conversion. This includes ligatures, kerning pairs, alternate glyphs, small caps, and other advanced typography features. The conversion process adapts the container format while preserving all font data.

Can I convert commercial/licensed fonts?

You can convert commercial fonts for testing purposes, but you must purchase the appropriate web font license before using them on a live website. Font licenses are format-specific – a desktop license for one format doesn't automatically grant web usage rights. Always check your license agreement or contact the foundry.

How is OTF different from WOFF?

OpenType Font (OTF) is an advanced format supporting cubic Bézier curves and OpenType features. Web Open Font Format (WOFF) is a web format with broad browser support. Choose based on your target platform and requirements.

What's the best format for my use case?

For modern websites, use WOFF as your primary format. Provide WOFF as a fallback for older browsers. For desktop applications, consider OTF or OTF.

Can I convert variable fonts?

Yes, variable fonts can be converted between formats while preserving all variation axes and design space. The conversion maintains the font's interpolation capabilities. Ensure your target browsers support variable fonts (Chrome 62+, Firefox 62+, Safari 11+).

OTF

WOFF

OTF to WOFF Converter

Convert OpenType Font to Web Open Font Format. 50 MB file size, unlimited uploads. Fast, secure, and completely private conversion.

OTF to WOFF50 MB File Size100% Free ForeverFastPrivateInstant Processing

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Disclaimer: This tool is provided as-is for convenience and does not constitute legal advice. Font licenses vary; you are responsible for ensuring you have the rights to upload and convert files and that your intended use is permitted. Converting a font does not grant new rights. Results may be imperfect, and use is at your own risk.

Developer & Verifier

Developed by

Marcus Rodriguez

Lead Developer

Verified by

Sarah Mitchell

Product Designer, Font Specialist

Convert Any Font Format

Universal Font Converter

Convert to WOFF Format

Any Font to WOFF

About This Conversion

Everything you need to know about converting between these formats

Source Format

OpenType Font

OpenType Font (OTF) is an extension of TrueType, offering advanced typographic features like ligatures and alternate glyphs. It supports more characters and is preferred for professional design work due to its superior font rendering capabilities.

Target Format

Web Open Font Format

Web Open Font Format (WOFF) is specifically optimized for web use with built-in compression. It's supported by all modern browsers and is ideal for websites. WOFF files are typically 40% smaller than their TTF/OTF equivalents.

Why Convert OTF to WOFF?

Deploying fonts for web applications with broad browser support

Reducing font file sizes for improved website performance

Ensuring compatibility with browsers from IE9 onwards

Creating web font kits for responsive design projects

How to Convert OTF to WOFF

Simple 3-step process that takes less than a minute

Upload Your Font

Select your OTF font file from your computer or drag and drop it into the converter above.

Convert Instantly

Click the convert button and our tool will process your font file in server RAM only. Files are processed and immediately deleted - never written to disk.

Download Result

Your converted WOFF file will be ready immediately. Download it and use it in your project.

OTF vs WOFF: Feature Comparison

Technical comparison between source and target formats

Feature	OTF	WOFF	Winner
File Size	180 KB	85 KB (-53%)	WOFF
Browser Support	Limited (not optimized)	99%+ (IE9+)	WOFF
Desktop Support	Universal	None	OTF
Compression	None	Gzip	WOFF
Page Load Speed	Slow	Fast (53% smaller)	WOFF
PostScript Curves	Preserved	May convert to TrueType	OTF
Best For	Desktop applications	Web deployment	Depends

Frequently Asked Questions

Common questions about converting OTF to WOFF

1Does OTF to WOFF conversion preserve PostScript curves?

If your OTF uses PostScript (CFF) outlines, they are converted to the TrueType format during WOFF conversion. This is a lossless conversion – the visual appearance remains identical, but the underlying curve mathematics changes from cubic Bézier to quadratic Bézier.

2Will I lose OpenType features converting OTF to WOFF?

No, all OpenType features (ligatures, stylistic sets, alternates, small caps, kerning) are fully preserved in WOFF. The WOFF format is specifically designed to maintain all font functionality while compressing the file.

3How much smaller will my OTF be as WOFF?

Expect 35-55% file size reduction. A 200KB OTF typically becomes 90-130KB as WOFF. PostScript-based OTF fonts often compress slightly better than TrueType-based OTF due to the curve data structure.

4Should I convert OTF or TTF to WOFF for web use?

It doesn't matter much – both convert to WOFF equally well. If you have both OTF and TTF versions of the same font, use whichever one you already have. The WOFF output will be nearly identical in size and quality regardless of source format.

5Does WOFF support CFF (PostScript) outlines?

Yes, WOFF can contain either TrueType or CFF outlines. When converting CFF-based OTF to WOFF, the PostScript outlines are typically preserved in the WOFF file (WOFF-CFF), maintaining the original outline format.

6Which browsers support WOFF from OTF?

All browsers that support WOFF (IE9+, Chrome 36+, Firefox 39+, Safari 5.1+) work with WOFF files converted from OTF. Browser support is based on the WOFF format, not whether the source was OTF or TTF.

7Can I use WOFF from OTF in desktop applications?

No, WOFF is a web-only format. Desktop applications (Photoshop, Word, etc.) cannot use WOFF files. Keep your OTF files for desktop use and create WOFF versions specifically for web deployment.

8Do Adobe Fonts work better as OTF or WOFF on web?

For web use, always convert Adobe OTF fonts to WOFF or WOFF2. The original OTF format is not optimized for web delivery. WOFF provides compression and faster loading while maintaining all Adobe font features.

File Size Comparison

See how file sizes change after conversion

Original (OTF)	Converted (WOFF)	Change	Notes
180 KB (OTF)	85 KB (WOFF)	-53% smaller	Gzip compression effective on OTF
350 KB (OTF)	155 KB (WOFF)	-56% smaller	PostScript OTF compresses well
100 KB (OTF)	55 KB (WOFF)	-45% smaller	Small OTF files compress less
700 KB (OTF)	290 KB (WOFF)	-59% smaller	Complex OTF fonts compress excellently

Performance Metrics

Technical performance indicators for this conversion

File Size Reduction:35-55%
OTF compresses slightly differently than TTF, still excellent reduction
Page Load Improvement:180-380ms faster
Smaller compressed files download faster
Browser Support:99%+ users
Works in all browsers from 2011+ (IE9+, Chrome 6+, Firefox 3.6+)
PostScript Preservation:Varies
Some converters maintain CFF outlines, others convert to TrueType
Render Quality:Identical
No visual quality difference between OTF and WOFF rendering
Cache Efficiency:Excellent
Compressed files cache better on CDN and browser

Implementation Examples

Production-ready code for your converted fonts

OTF to WOFF Basic Implementation

Standard web font setup from OTF source

@font-face {
    font-family: 'Playfair Display';
    src: url('fonts/PlayfairDisplay-Regular.woff2') format('woff2'),
         url('fonts/PlayfairDisplay-Regular.woff') format('woff');
    font-weight: 400;
    font-display: swap;
  }
  
  h1 {
    font-family: 'Playfair Display', Georgia, serif;
  }

PostScript OTF to Web

Converting PostScript-based OTF fonts

@font-face {
    font-family: 'Adobe Garamond Pro';
    src: url('fonts/AGaramondPro-Regular.woff2') format('woff2'),
         url('fonts/AGaramondPro-Regular.woff') format('woff');
    font-weight: 400;
    font-display: swap;
  }
  
  .elegant-text {
    font-family: 'Adobe Garamond Pro', 'Times New Roman', serif;
  }

Multiple Styles from OTF

Complete font family with italic and bold

@font-face {
    font-family: 'Merriweather';
    src: url('fonts/Merriweather-Regular.woff2') format('woff2'),
         url('fonts/Merriweather-Regular.woff') format('woff');
    font-weight: 400;
    font-style: normal;
    font-display: swap;
  }
  
  @font-face {
    font-family: 'Merriweather';
    src: url('fonts/Merriweather-Italic.woff2') format('woff2'),
         url('fonts/Merriweather-Italic.woff') format('woff');
    font-weight: 400;
    font-style: italic;
    font-display: swap;
  }
  
  @font-face {
    font-family: 'Merriweather';
    src: url('fonts/Merriweather-Bold.woff2') format('woff2'),
         url('fonts/Merriweather-Bold.woff') format('woff');
    font-weight: 700;
    font-style: normal;
    font-display: swap;
  }

Browser Compatibility

Which browsers support WOFF fonts

Browser	Support	Notes
Chrome	6+	Full support since 2010
Firefox	3.6+	Full support since 2010
Safari	5.1+	Full support since 2011
Edge	All versions	Full support
IE	9+	No support in IE8 and below
Opera	11.1+	Full support since 2011
iOS Safari	5+	Full support on all modern iOS
Android Browser	4.4+	Full support since 2013
Chrome Mobile	All versions	Full support
Samsung Internet	All versions	Full support

Troubleshooting Common Issues

Solutions to problems you might encounter

PostScript curves converted to TrueType

Some converters convert CFF (PostScript) outlines to TrueType during WOFF compression. This is mathematically lossless – visual quality is identical. If you need to preserve PostScript outlines specifically, look for WOFF-CFF converters (less common).

File size reduction less than expected

PostScript-based OTF fonts sometimes compress slightly differently than TrueType. Expect 35-55% reduction instead of 40-60%. This is still significant. For better compression, convert to WOFF2 instead (60-70% reduction).

Advanced typography features missing

Verify the original OTF had those features using a font inspector. WOFF preserves all OpenType features. If features are missing, they weren't in the original OTF, or the conversion tool doesn't support advanced feature tables.

WOFF doesn't work in desktop applications

WOFF is web-only. Desktop applications (Photoshop, Word) cannot use WOFF files. Keep your OTF files for desktop use and create WOFF versions separately for web deployment. Don't replace desktop fonts with WOFF.

Font loads slowly on website

Use font subsetting to remove unused glyphs. Add font-display: swap to @font-face. Preload critical fonts with <link rel="preload">. Consider converting to WOFF2 for even better compression (25-30% smaller than WOFF).

When NOT to Use WOFF

Scenarios where you should keep OTF or choose a different format

Desktop application use
Why not: WOFF is web-only; desktop apps cannot use WOFF files
Use instead: Keep OTF for desktop; only convert to WOFF for websites
Best compression needed
Why not: WOFF is good but WOFF2 is 25-30% smaller
Use instead: Convert to WOFF2 instead; use WOFF only as IE9-11 fallback
Font editing required
Why not: WOFF is a delivery format; editing software needs OTF source
Use instead: Keep OTF for editing; generate WOFF for final web deployment only
Adobe fonts with restrictions
Why not: Adobe desktop font licenses may not grant web rights
Use instead: Check license; use Adobe Fonts web service or purchase web license

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