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TTC (.ttc)

.ttc file signature | application/x-font-ttf

TrueType Collection (TTC) is a font container format developed by Apple and Microsoft that combines multiple TrueType font faces into a single file. It is used in operating systems, desktop publishing software, and other applications that need to share glyph data across related typefaces. TTC files are generally safe, but as with other font formats, malformed files can exploit parsing bugs in older or unpatched software.

Safe

Magic Bytes

Offset 0
00 01 00 00

Sources: Apache Tika

Extension

.ttc

MIME Type

application/x-font-ttf

Byte Offset

0

Risk Level

Safe

Validation Code

How to validate .ttc files in Python

Python 
def is_ttc(file_path: str) -> bool:
    """Check if file is a valid TTC by magic bytes."""
    signature = bytes([0x00, 0x01, 0x00, 0x00])
    with open(file_path, "rb") as f:
        return f.read(4) == signature

How to validate .ttc files in Node.js

Node.js 
function isTTC(buffer: Buffer): boolean {
  const signature = Buffer.from([0x00, 0x01, 0x00, 0x00]);
  return buffer.subarray(0, 4).equals(signature);
}

How to validate .ttc files in Go

Go 
func IsTTC(data []byte) bool {
    signature := []byte{0x00, 0x01, 0x00, 0x00}
    if len(data) < 4 {
        return false
    }
    return bytes.Equal(data[:4], signature)
}

API Endpoint

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

See the full API documentation for all endpoints and parameters.

Related Formats

.ttf .dfont .afm .eot .otf .pfa

Frequently Asked Questions

What is a .ttc file?

A .ttc file is identified by the magic bytes 00 01 00 00 at byte offset 0. TrueType Collection (TTC) is a font container format developed by Apple and Microsoft that combines multiple TrueType font faces into a single file. It is used in operating systems, desktop publishing software, and other applications that need to share glyph data across related typefaces. TTC files are generally safe, but as with other font formats, malformed files can exploit parsing bugs in older or unpatched software.

What are the magic bytes for .ttc files?

The magic bytes for TTC files are 00 01 00 00 at byte offset 0. These bytes uniquely identify the file format regardless of the file extension.

How do I validate a .ttc file?

To validate a .ttc file, read the first bytes of the file and compare them against the known magic bytes (00 01 00 00) at offset 0. This is more reliable than checking the file extension alone, as extensions can be renamed.

What is the MIME type for .ttc files?

The primary MIME type for .ttc files is application/x-font-ttf.

Is it safe to open .ttc files?

TTC (.ttc) 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.