Embedded OpenType
An EOT (Embedded OpenType) file is a legacy web font format created by Microsoft for Internet Explorer. It wraps TrueType or OpenType fonts with MicroType Express compression and URL-binding DRM, and has been superseded by WOFF and WOFF2.
Legacy web font format. Font conversion requires glyph table remapping not available in browser WASM.
أسئلة شائعة
Do I still need EOT fonts for my website?
Almost certainly not. EOT is only needed for Internet Explorer 6-8, which have near-zero market share. Use WOFF2 as the primary format with WOFF as a fallback for older browsers.
What is URL binding in EOT?
URL binding is a DRM mechanism where the EOT header contains root URL strings. Internet Explorer checks the page URL against these strings and refuses to render the font if they don't match, preventing unauthorized font usage on other domains.
How do I convert my EOT font stack to WOFF2?
Use fontTools (pip install fonttools brotli) to convert: open the EOT with TTFont and save with flavor='woff2'. Then update your CSS @font-face declarations to serve WOFF2 first.
ما يميز .EOT
What is an EOT file?
EOT (Embedded OpenType) is a web font format designed by Microsoft for use with Internet Explorer. It was created to allow TrueType and OpenType fonts to be embedded in web pages while supporting DRM-like URL binding. EOT has been largely replaced by WOFF and WOFF2 but is still needed for IE8 compatibility.
اكتشف التفاصيل التقنية
How to open EOT files
- Internet Explorer (Windows) — Native rendering
- Web browsers — Only IE supports EOT natively
- FontForge (Windows, macOS, Linux) — Free font editor
- ttf2eot — Command-line converter
Technical specifications
| Property | Value |
|---|---|
| Base Format | Compressed OpenType/TrueType |
| Compression | MicroType Express (MTX) |
| DRM | URL root string binding |
| Browser Support | Internet Explorer only |
| Successor | WOFF, WOFF2 |
Common use cases
- Legacy IE support: Web fonts for Internet Explorer 6-8.
- Corporate intranets: Legacy IE-dependent web applications.
- Font stacks: Fallback in legacy @font-face declarations.
- Migration: Converting to WOFF2 for modern browsers.
المرجع التقني
- نوع MIME
application/vnd.ms-fontobject- المطوّر
- Microsoft
- سنة التقديم
- 2007
- معيار مفتوح
- لا
البنية الثنائية
EOT wraps a TrueType or OpenType font in a proprietary header containing the EOT size, font data size, version, flags, PANOSE classification, URL root strings for binding, and the font family/style names. The font data follows, optionally compressed with MicroType Express (MTX).
| Offset | Length | Field | Example | Description |
|---|---|---|---|---|
0x00 | 4 bytes | EOTSize | 00 00 01 xx | Total size of the EOT file in bytes (little-endian DWORD) |
0x04 | 4 bytes | FontDataSize | variable | Size of the embedded OpenType font data |
0x08 | 4 bytes | Version | 00 02 00 01 | EOT format version (0x00020001 for version 2.1) |
0x0C | 4 bytes | Flags | variable | Processing flags including TTEMBED_SUBSET and TTEMBED_TTCOMPRESSED |
0x10 | 10 bytes | PANOSE | variable | PANOSE font classification bytes for font matching |
variable | variable | RootString | http://example.com | URL root strings for domain-binding DRM |
نقاط الضعف
- Malformed font tables exploiting IE's font parsing engine (historical CVEs in T2EMBED.DLL)
- MTX decompression buffer overflows in legacy IE versions
الحماية: FileDex does not open, execute, or parse these files. Reference page only.