ASCIISTL
application/octet-stream
Magic Bytes
Offset: 0
73 72 63 64 6F 63 69 64 3A
The ASCII Standard Tessellation Language (STL) is a file format developed by 3D Systems for representing three-dimensional surface geometry using a mesh of triangles. It is primarily utilized in computer-aided design, rapid prototyping, and 3D printing software to describe the physical layout of solid objects. Although this ASCII representation is technically legacy compared to its binary counterpart, it remains widely supported across engineering platforms due to its human-readable nature and cross-platform compatibility.
Validation Code
How to validate .stl files in Python
Python
def is_stl(file_path: str) -> bool:
"""Check if file is a valid STL by magic bytes."""
signature = bytes([0x73, 0x72, 0x63, 0x64, 0x6F, 0x63, 0x69, 0x64, 0x3A])
with open(file_path, "rb") as f:
return f.read(9) == signatureHow to validate .stl files in Node.js
Node.js
function isSTL(buffer: Buffer): boolean {
const signature = Buffer.from([0x73, 0x72, 0x63, 0x64, 0x6F, 0x63, 0x69, 0x64, 0x3A]);
return buffer.subarray(0, 9).equals(signature);
}
Go
func IsSTL(data []byte) bool {
signature := []byte{0x73, 0x72, 0x63, 0x64, 0x6F, 0x63, 0x69, 0x64, 0x3A}
if len(data) < 9 {
return false
}
return bytes.Equal(data[:9], signature)
}API Endpoint
GET
/api/v1/stl
curl https://filesignature.org/api/v1/stl