TrueType font file (.ttf)
.ttf file signature | application/x-font-ttf
TrueType Font (TTF) is a digital font file format developed by Apple and later adopted by Microsoft, with support maintained by operating system and font software vendors. It is used for on-screen text, printing, and document embedding in desktop publishing, office software, and web-related workflows. Although generally safe, fonts can contain malformed data that may trigger parsing bugs, and TTF is now a legacy format in some modern font ecosystems.
Magic Bytes
Offset 0
00 01 00 00 00
Sources: Wikipedia, Gary Kessler
All Known Signatures
3 signature variants are documented for .ttf files across multiple sources.
| Hex Signature | Offset | Sources |
|---|---|---|
| 00 01 00 00 00 | 0 | Wikipedia, Gary Kessler |
| 00 01 00 00 | 0 | Apache Tika |
| 74 72 75 65 00 | 0 | Gary Kessler |
Extension
.ttf
MIME Type
application/x-font-ttf
Byte Offset
0
Risk Level
Safe
Validation Code
How to validate .ttf files in Python
def is_ttf(file_path: str) -> bool:
"""Check if file is a valid TTF by magic bytes."""
signature = bytes([0x00, 0x01, 0x00, 0x00, 0x00])
with open(file_path, "rb") as f:
return f.read(5) == signatureHow to validate .ttf files in Node.js
function isTTF(buffer: Buffer): boolean {
const signature = Buffer.from([0x00, 0x01, 0x00, 0x00, 0x00]);
return buffer.subarray(0, 5).equals(signature);
}How to validate .ttf files in Go
func IsTTF(data []byte) bool {
signature := []byte{0x00, 0x01, 0x00, 0x00, 0x00}
if len(data) < 5 {
return false
}
return bytes.Equal(data[:5], signature)
}API Endpoint
/api/v1/ttf
curl https://filesignature.org/api/v1/ttf
See the full API documentation for all endpoints and parameters.
Related Formats
Frequently Asked Questions
What is a .ttf file?
A .ttf file is a TrueType font file file. TrueType Font (TTF) is a digital font file format developed by Apple and later adopted by Microsoft, with support maintained by operating system and font software vendors. It is used for on-screen text, printing, and document embedding in desktop publishing, office software, and web-related workflows. Although generally safe, fonts can contain malformed data that may trigger parsing bugs, and TTF is now a legacy format in some modern font ecosystems.
What are the magic bytes for .ttf files?
The magic bytes for TrueType font file files are 00 01 00 00 00 at byte offset 0. These bytes uniquely identify the file format regardless of the file extension.
How do I validate a .ttf file?
To validate a .ttf file, read the first bytes of the file and compare them against the known magic bytes (00 01 00 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 .ttf files?
The primary MIME type for .ttf files is application/x-font-ttf.
Is it safe to open .ttf files?
TrueType font file (.ttf) 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.