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EOT converter

Embedded OpenType, extension .eot, was Microsoft's proprietary web-font format for Internet Explorer: a TrueType or OpenType font compressed and optionally bound to specific domains so it could not be reused elsewhere. For a decade it was the only way to serve custom fonts to the web's then-dominant browser.

Private for supported formats — processed in your browser

Convert supported files

Runs on your device

Drop EOT files here

Batch files can each use a different output. Nothing uploads for local conversions.

Working inputs include camera RAW, browser-local audio/video, PDF, CBZ/CBR comics, office documents, ebooks, markup, 3D models, structured text, images, and archives.

Where EOT comes from

Microsoft built EOT for Internet Explorer 4 in the late 1990s, an outgrowth of its font-embedding work for Office documents and the WEFT authoring tool. It submitted the format to the W3C in 2008 hoping for standardization, but the web chose the vendor-neutral WOFF instead, and EOT's fate was sealed when Microsoft retired Internet Explorer in June 2022.

How EOT works

  • A header wrapping a TrueType font, optionally compressed with the proprietary MicroType Express scheme.
  • Root strings in the header can restrict the font to named domains — an early licensing-enforcement mechanism.
  • Only Internet Explorer ever implemented it; no other browser shipped support.
  • The old @font-face ?#iefix query-string hack exists purely to stop IE8 from choking on multi-format src lists.

When to use EOT

  • Maintaining intranet applications pinned to old Internet Explorer versions
  • Reading archived web assets from the 2000s
  • Extracting stranded fonts back to TTF for reuse

Strengths and limitations

Strengths

  • Solved web typography for IE4 through IE8 years before any open alternative existed
  • Domain-binding reassured foundries wary of font piracy
  • MicroType Express compression kept downloads small on dial-up-era connections

Limitations

  • Obsolete: its only consumer, Internet Explorer, has been retired since 2022
  • Proprietary compression limits even read-side tool support
  • No reason remains to generate a new .eot file

Compatibility

Internet Explorer 4 through 11 was the entire market for .eot; Edge, Chrome, Firefox, and Safari never supported it. With IE fully retired, the format is dead weight in font stacks, and its practical relevance is limited to unwrapping legacy files to recover the font inside.

The wrapper preserves the embedded font's name table and adds header fields for the family name and the domain root strings that governed where the font could be used.

Convert EOT to another format

Convert other formats to EOT