QOI (.qoi)
.qoi file signature | application/octet-stream
Quite OK Image (QOI) is a lossless raster image format created by Dominic Szablewski and maintained through an open, community-accessible specification. It is used for storing and exchanging images in software that benefits from simple decoding and compact implementation, especially in development tools and libraries. The format is relatively recent and generally safe, though, as with any image file, corrupted or malformed files can still trigger parser bugs in poorly implemented decoders.
Magic Bytes
Offset 0
71 6F 69 66
Sources: Wikipedia
Extension
.qoi
MIME Type
application/octet-stream
Byte Offset
0
Risk Level
Safe
Validation Code
How to validate .qoi files in Python
def is_qoi(file_path: str) -> bool:
"""Check if file is a valid QOI by magic bytes."""
signature = bytes([0x71, 0x6F, 0x69, 0x66])
with open(file_path, "rb") as f:
return f.read(4) == signatureHow to validate .qoi files in Node.js
function isQOI(buffer: Buffer): boolean {
const signature = Buffer.from([0x71, 0x6F, 0x69, 0x66]);
return buffer.subarray(0, 4).equals(signature);
}How to validate .qoi files in Go
func IsQOI(data []byte) bool {
signature := []byte{0x71, 0x6F, 0x69, 0x66}
if len(data) < 4 {
return false
}
return bytes.Equal(data[:4], signature)
}API Endpoint
/api/v1/qoi
curl https://filesignature.org/api/v1/qoi
See the full API documentation for all endpoints and parameters.
Frequently Asked Questions
What is a .qoi file?
A .qoi file is identified by the magic bytes 71 6F 69 66 at byte offset 0. Quite OK Image (QOI) is a lossless raster image format created by Dominic Szablewski and maintained through an open, community-accessible specification. It is used for storing and exchanging images in software that benefits from simple decoding and compact implementation, especially in development tools and libraries. The format is relatively recent and generally safe, though, as with any image file, corrupted or malformed files can still trigger parser bugs in poorly implemented decoders.
What are the magic bytes for .qoi files?
The magic bytes for QOI files are 71 6F 69 66 at byte offset 0. These bytes uniquely identify the file format regardless of the file extension.
How do I validate a .qoi file?
To validate a .qoi file, read the first bytes of the file and compare them against the known magic bytes (71 6F 69 66) at offset 0. This is more reliable than checking the file extension alone, as extensions can be renamed.
What is the MIME type for .qoi files?
There is no officially registered MIME type for .qoi files. Systems typically use application/octet-stream as a generic fallback when handling this format.
Is it safe to open .qoi files?
QOI (.qoi) 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.