OpenDocument text document (.odt)
.odt file signature | application/vnd.oasis.opendocument.text
OpenDocument Text (ODT) is a word-processing file format defined and maintained by OASIS as part of the OpenDocument standard. It is used for letters, reports, manuals, and other editable text documents in applications such as LibreOffice, Apache OpenOffice, and compatible office suites. The format is generally safe, though documents may contain embedded objects, macros in associated suites, or links, so files from untrusted sources should still be reviewed carefully.
Magic Bytes
Offset 0
50 4B 03 04
Sources: Wikipedia, Gary Kessler
All Known Signatures
5 signature variants are documented for .odt files across multiple sources.
| Hex Signature | Offset | Sources |
|---|---|---|
| 50 4B 03 04 | 0 | Wikipedia, Gary Kessler |
| 50 4B | 0 | Apache Tika |
| 50 4B 05 06 | 0 | Wikipedia |
| 50 4B 07 08 | 0 | Wikipedia |
| 6D 69 6D 65 74 79 70 65 61 70 70 6C 69 63 61 74 69 6F 6E 2F 76 6E 64 2E 6F 61 73 69 73 2E 6F 70 65 6E 64 6F 63 75 6D 65 6E 74 2E 74 65 78 74 | 0 | Neil Harvey FileSignatures |
Extension
.odt
MIME Type
application/vnd.oasis.opendocument.text
Byte Offset
0
Risk Level
Safe
Validation Code
How to validate .odt files in Python
def is_odt(file_path: str) -> bool:
"""Check if file is a valid ODT by magic bytes."""
signature = bytes([0x50, 0x4B, 0x03, 0x04])
with open(file_path, "rb") as f:
return f.read(4) == signatureHow to validate .odt files in Node.js
function isODT(buffer: Buffer): boolean {
const signature = Buffer.from([0x50, 0x4B, 0x03, 0x04]);
return buffer.subarray(0, 4).equals(signature);
}How to validate .odt files in Go
func IsODT(data []byte) bool {
signature := []byte{0x50, 0x4B, 0x03, 0x04}
if len(data) < 4 {
return false
}
return bytes.Equal(data[:4], signature)
}API Endpoint
/api/v1/odt
curl https://filesignature.org/api/v1/odt
See the full API documentation for all endpoints and parameters.
Related Formats
Frequently Asked Questions
What is a .odt file?
A .odt file is a OpenDocument text document file. OpenDocument Text (ODT) is a word-processing file format defined and maintained by OASIS as part of the OpenDocument standard. It is used for letters, reports, manuals, and other editable text documents in applications such as LibreOffice, Apache OpenOffice, and compatible office suites. The format is generally safe, though documents may contain embedded objects, macros in associated suites, or links, so files from untrusted sources should still be reviewed carefully.
What are the magic bytes for .odt files?
The magic bytes for OpenDocument text document files are 50 4B 03 04 at byte offset 0. These bytes uniquely identify the file format regardless of the file extension.
How do I validate a .odt file?
To validate a .odt file, read the first bytes of the file and compare them against the known magic bytes (50 4B 03 04) at offset 0. This is more reliable than checking the file extension alone, as extensions can be renamed.
What is the MIME type for .odt files?
The primary MIME type for .odt files is application/vnd.oasis.opendocument.text.
Is it safe to open .odt files?
OpenDocument text document (.odt) 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.