Web Open Font Format 2 (.woff2)
.woff2 file signature | application/octet-stream
Web Open Font Format 2 (WOFF2) is a web font file format developed by the W3C WebFonts Working Group for delivering compressed font data to browsers. It is used to embed custom typefaces in websites and web applications, supporting consistent text rendering across platforms and devices. WOFF2 is generally safe, though fonts from untrusted sources should be handled by updated software because parsing vulnerabilities have historically affected font engines.
Magic Bytes
Offset 0
77 4F 46 32
Sources: Wikipedia, Gary Kessler
Extension
.woff2
MIME Type
application/octet-stream
Byte Offset
0
Risk Level
Safe
Validation Code
How to validate .woff2 files in Python
def is_woff2(file_path: str) -> bool:
"""Check if file is a valid WOFF2 by magic bytes."""
signature = bytes([0x77, 0x4F, 0x46, 0x32])
with open(file_path, "rb") as f:
return f.read(4) == signatureHow to validate .woff2 files in Node.js
function isWOFF2(buffer: Buffer): boolean {
const signature = Buffer.from([0x77, 0x4F, 0x46, 0x32]);
return buffer.subarray(0, 4).equals(signature);
}How to validate .woff2 files in Go
func IsWOFF2(data []byte) bool {
signature := []byte{0x77, 0x4F, 0x46, 0x32}
if len(data) < 4 {
return false
}
return bytes.Equal(data[:4], signature)
}API Endpoint
/api/v1/woff2
curl https://filesignature.org/api/v1/woff2
See the full API documentation for all endpoints and parameters.
Related Formats
Frequently Asked Questions
What is a .woff2 file?
A .woff2 file is a Web Open Font Format 2 file. Web Open Font Format 2 (WOFF2) is a web font file format developed by the W3C WebFonts Working Group for delivering compressed font data to browsers. It is used to embed custom typefaces in websites and web applications, supporting consistent text rendering across platforms and devices. WOFF2 is generally safe, though fonts from untrusted sources should be handled by updated software because parsing vulnerabilities have historically affected font engines.
What are the magic bytes for .woff2 files?
The magic bytes for Web Open Font Format 2 files are 77 4F 46 32 at byte offset 0. These bytes uniquely identify the file format regardless of the file extension.
How do I validate a .woff2 file?
To validate a .woff2 file, read the first bytes of the file and compare them against the known magic bytes (77 4F 46 32) at offset 0. This is more reliable than checking the file extension alone, as extensions can be renamed.
What is the MIME type for .woff2 files?
There is no officially registered MIME type for .woff2 files. Systems typically use application/octet-stream as a generic fallback when handling this format.
Is it safe to open .woff2 files?
Web Open Font Format 2 (.woff2) 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.