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EOT (.eot)

.eot file signature | application/vnd.ms-fontobject

Embedded OpenType (EOT) is a font file format developed by Microsoft for packaging and delivering TrueType fonts for web use. It is used primarily to embed fonts in websites and documents, ensuring consistent text rendering in browsers and applications that support the format. EOT is a legacy web font format with limited modern adoption; like other font files, it should be obtained from trusted sources because malformed fonts can expose parsing vulnerabilities.

Safe

Magic Bytes

Offset 8
02 00 02 00

Sources: Apache Tika

Extension

.eot

MIME Type

application/vnd.ms-fontobject

Byte Offset

8

Risk Level

Safe

Validation Code

How to validate .eot files in Python

Python 
def is_eot(file_path: str) -> bool:
    """Check if file is a valid EOT by magic bytes at offset 8."""
    signature = bytes([0x02, 0x00, 0x02, 0x00])
    with open(file_path, "rb") as f:
        f.seek(8)
        return f.read(4) == signature

How to validate .eot files in Node.js

Node.js 
function isEOT(buffer: Buffer): boolean {
  const signature = Buffer.from([0x02, 0x00, 0x02, 0x00]);
  if (buffer.length < 12) return false;
  return buffer.subarray(8, 12).equals(signature);
}

How to validate .eot files in Go

Go 
func IsEOT(data []byte) bool {
    signature := []byte{0x02, 0x00, 0x02, 0x00}
    if len(data) < 12 {
        return false
    }
    return bytes.Equal(data[8:12], signature)
}

API Endpoint

GET /api/v1/eot
curl https://filesignature.org/api/v1/eot

See the full API documentation for all endpoints and parameters.

Related Formats

.afm .otf .pfa .pfb .pfm .ttc

Frequently Asked Questions

What is a .eot file?

A .eot file is identified by the magic bytes 02 00 02 00 at byte offset 8. Embedded OpenType (EOT) is a font file format developed by Microsoft for packaging and delivering TrueType fonts for web use. It is used primarily to embed fonts in websites and documents, ensuring consistent text rendering in browsers and applications that support the format. EOT is a legacy web font format with limited modern adoption; like other font files, it should be obtained from trusted sources because malformed fonts can expose parsing vulnerabilities.

What are the magic bytes for .eot files?

The magic bytes for EOT files are 02 00 02 00 at byte offset 8. These bytes uniquely identify the file format regardless of the file extension.

How do I validate a .eot file?

To validate a .eot file, read the first bytes of the file and compare them against the known magic bytes (02 00 02 00) at offset 8. This is more reliable than checking the file extension alone, as extensions can be renamed.

What is the MIME type for .eot files?

The primary MIME type for .eot files is application/vnd.ms-fontobject.

Is it safe to open .eot files?

EOT (.eot) files are generally safe to open. They are classified as low risk because they primarily contain data rather than executable code. However, always ensure files come from a trusted source.