FH11 (.fh11)
.fh11 file signature | image/x-freehand
FH11 is a FreeHand 11 drawing file format developed by Macromedia and later maintained by Adobe following its acquisition of FreeHand. It was used for vector illustrations, page layouts, logos, and other graphic design work in desktop publishing and prepress workflows. The format is now legacy and largely superseded by newer graphics standards, although opening untrusted files should still be done with current software because older document formats can expose parsing vulnerabilities.
Magic Bytes
Offset 0
41 47 44 32
Sources: Apache Tika
All Known Signatures
6 signature variants are documented for .fh11 files across multiple sources.
| Hex Signature | Offset | Sources |
|---|---|---|
| 41 47 44 32 | 0 | Apache Tika |
| 41 47 44 33 | 0 | Apache Tika |
| 41 47 44 34 | 0 | Apache Tika |
| 46 72 65 65 48 61 6E 64 31 30 | 0 | Apache Tika |
| 46 72 65 65 48 61 6E 64 31 31 | 0 | Apache Tika |
| 46 72 65 65 48 61 6E 64 31 32 | 0 | Apache Tika |
Extension
.fh11
MIME Type
image/x-freehand
Byte Offset
0
Risk Level
Safe
Validation Code
How to validate .fh11 files in Python
def is_fh11(file_path: str) -> bool:
"""Check if file is a valid FH11 by magic bytes."""
signature = bytes([0x41, 0x47, 0x44, 0x32])
with open(file_path, "rb") as f:
return f.read(4) == signatureHow to validate .fh11 files in Node.js
function isFH11(buffer: Buffer): boolean {
const signature = Buffer.from([0x41, 0x47, 0x44, 0x32]);
return buffer.subarray(0, 4).equals(signature);
}How to validate .fh11 files in Go
func IsFH11(data []byte) bool {
signature := []byte{0x41, 0x47, 0x44, 0x32}
if len(data) < 4 {
return false
}
return bytes.Equal(data[:4], signature)
}API Endpoint
/api/v1/fh11
curl https://filesignature.org/api/v1/fh11
See the full API documentation for all endpoints and parameters.
Related Formats
Frequently Asked Questions
What is a .fh11 file?
A .fh11 file is identified by the magic bytes 41 47 44 32 at byte offset 0. FH11 is a FreeHand 11 drawing file format developed by Macromedia and later maintained by Adobe following its acquisition of FreeHand. It was used for vector illustrations, page layouts, logos, and other graphic design work in desktop publishing and prepress workflows. The format is now legacy and largely superseded by newer graphics standards, although opening untrusted files should still be done with current software because older document formats can expose parsing vulnerabilities.
What are the magic bytes for .fh11 files?
The magic bytes for FH11 files are 41 47 44 32 at byte offset 0. These bytes uniquely identify the file format regardless of the file extension.
How do I validate a .fh11 file?
To validate a .fh11 file, read the first bytes of the file and compare them against the known magic bytes (41 47 44 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 .fh11 files?
The primary MIME type for .fh11 files is image/x-freehand.
Is it safe to open .fh11 files?
FH11 (.fh11) 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.