WebM video file (.webm)
.webm file signature | application/octet-stream
Matroskamedia container, includingWebM
Magic Bytes
Offset 0
1A 45 DF A3
Sources: Wikipedia, Gary Kessler
Extension
.webm
MIME Type
application/octet-stream
Byte Offset
0
Risk Level
Safe
Validation Code
How to validate .webm files in Python
def is_webm(file_path: str) -> bool:
"""Check if file is a valid WEBM by magic bytes."""
signature = bytes([0x1A, 0x45, 0xDF, 0xA3])
with open(file_path, "rb") as f:
return f.read(4) == signatureHow to validate .webm files in Node.js
function isWEBM(buffer: Buffer): boolean {
const signature = Buffer.from([0x1A, 0x45, 0xDF, 0xA3]);
return buffer.subarray(0, 4).equals(signature);
}How to validate .webm files in Go
func IsWEBM(data []byte) bool {
signature := []byte{0x1A, 0x45, 0xDF, 0xA3}
if len(data) < 4 {
return false
}
return bytes.Equal(data[:4], signature)
}API Endpoint
/api/v1/webm
curl https://filesignature.org/api/v1/webm
See the full API documentation for all endpoints and parameters.
Frequently Asked Questions
What is a .webm file?
A .webm file is a WebM video file file. Matroskamedia container, includingWebM
What are the magic bytes for .webm files?
The magic bytes for WebM video file files are 1A 45 DF A3 at byte offset 0. These bytes uniquely identify the file format regardless of the file extension.
How do I validate a .webm file?
To validate a .webm file, read the first bytes of the file and compare them against the known magic bytes (1A 45 DF A3) at offset 0. This is more reliable than checking the file extension alone, as extensions can be renamed.
What is the MIME type for .webm files?
There is no officially registered MIME type for .webm files. Systems typically use application/octet-stream as a generic fallback when handling this format.
Is it safe to open .webm files?
WebM video file (.webm) 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.