Convert Fonts to Any Format
21 font formats. Professional quality with full Unicode and glyph support.
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How much smaller each format is
We converted one real typeface into every format we can measure end to end, and checked that no glyphs were lost along the way.
Source: Akrobat ExtraBold, 70.4 KB TrueType, 485 glyphs covering 432 characters. Converted with fontTools 4.63.
| Format | Type | Output size | vs source | Glyphs | Best for | Notes |
|---|---|---|---|---|---|---|
| WOFF2 | Web | 23 KB | 33% | 485 kept | Modern websites | Brotli compressed, the current standard |
| WOFF | Web | 32.5 KB | 46% | 485 kept | Older browser support | zlib compressed, universal fallback |
| OTF | Desktop | 45.7 KB | 65% | 485 kept | Design and print work | CFF outlines, richer typography |
| TTF | Desktop | 70.4 KB | 100% | 485 kept | Installing on any system | Uncompressed, the usual source |
| EOT | Web | 70.5 KB | 100% | n/a | Internet Explorer 8 and older | A wrapped TTF, so no size saving |
| SVG | Web | 111.7 KB | 159% | n/a | Legacy Safari only | Larger than the source, removed from browsers |
| AFM | Metrics | 12.2 KB | 17% | n/a | Typesetting systems | Spacing data only, contains no outlines |
- WOFF2 is the clear winner for the web at 23 KB, 33% of the original, with all 485 glyphs intact. WOFF saved less at 46% because it uses zlib rather than Brotli, but it is still worth shipping as a fallback.
- Converting to OTF rebuilt the outlines in the CFF format and came out at 65% of the TrueType source, which is why OpenType files from a foundry are often smaller than the TrueType equivalent.
- Two of the old web formats are worth avoiding. EOT is a TrueType font behind a small header, so it saves nothing at 100%, and SVG fonts came out at 159%, larger than the source, in a format browsers no longer support.
- AFM is not a font at all. At 12.2 KB it holds only spacing data and no outlines, so it belongs beside a font file rather than replacing one.
What runs in your browser
TTF, OTF and WOFF are converted on your device, so those files never leave your computer. WOFF2 uses Brotli compression, which browsers cannot yet produce for fonts, so it is handled on our servers along with the specialist formats.
The other formats on this page, including the Type 1, Mac suitcase and type-design source formats, are converted on our servers with FontForge. They are container and source formats whose size depends on what is packed inside them, so a single comparison figure would be misleading.
Supported Font Formats
Convert between 21 font formats, from desktop and web fonts to specialist print formats
Desktop Fonts
TrueType, the most widely supported desktop font.
Best for installing on Windows, macOS and Linux.
Works everywhere, but too large to serve on the web.
OpenType, built on TrueType with richer typography.
Best for professional design work and advanced features.
Supports ligatures, small caps and alternate glyphs.
Apple's datafork font suitcase format.
Best for older macOS systems.
Convert to TTF or OTF for anything current.
Compact Font Format, the PostScript outlines inside OTF.
Best as a building block rather than a delivered font.
Usually wrapped in OTF rather than used directly.
CID-keyed fonts, built for large character sets.
Best for Chinese, Japanese and Korean typefaces.
Handles tens of thousands of glyphs.
FontForge's own editable source format.
Best for editing a typeface you are still designing.
A working file, not something to ship.
Unified Font Object, an open source format for type design.
Best for collaborative type design work.
A folder of XML files rather than a single binary.
Web Fonts
Web Open Font Format, a compressed font for browsers.
Best for web pages that must support older browsers.
Roughly half the size of the TTF it came from.
The current web font standard, compressed with Brotli.
Best for any modern website.
The smallest of the lot: a third of the original in our test.
Embedded OpenType, Microsoft's old web font format.
Best only for Internet Explorer 8 and earlier.
Obsolete; use WOFF2 with a WOFF fallback.
Fonts described as SVG vector outlines.
Best for legacy Safari and some SVG workflows.
Removed from browsers, and larger than the source font.
Specialized Formats
PostScript Type 1, binary form.
Best for legacy print workflows.
Retired by Adobe; convert to OTF.
PostScript Type 1, ASCII form.
Best for old Unix and print systems.
The plain-text sibling of PFB.
Printer Font Metrics, the Windows companion to PFB.
Best kept alongside its matching PFB file.
Holds spacing data, not outlines.
Adobe Font Metrics, a plain-text metrics file.
Best for typesetting systems that need spacing data.
Contains no outlines at all.
A MacBinary-wrapped font resource.
Best for unpacking fonts from old Mac downloads.
Unwrap it before converting.
The classic Mac font suitcase.
Best for recovering fonts from old Mac archives.
A container that usually holds bitmap and Type 1 data.
A PostScript font program.
Best for legacy print pipelines.
Convert to OTF for modern use.
Type 42, a TrueType font wrapped for PostScript printers.
Best for sending TrueType outlines to a PostScript RIP.
A print transport format.
References
- WOFF File Format 2.0 - W3C Recommendation
- WOFF File Format 1.0 - W3C Recommendation
- OpenType Specification - Microsoft Learn
- TrueType Reference Manual - Apple Developer
- fontTools documentation
- @font-face - MDN Web Docs, Mozilla
- RFC 1950: ZLIB Compressed Data Format Specification - RFC Editor
- RFC 7932: Brotli Compressed Data Format - RFC Editor