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OTH (.oth)

.oth file signature | application/vnd.oasis.opendocument.text-web

OpenDocument Text Web (OTH) is an OASIS-maintained file format in the OpenDocument family, used for web-oriented text documents. It is used for publishing lightweight documents that can be opened by office suites and other OpenDocument-compatible applications, including LibreOffice and Apache OpenOffice. The format is generally safe, though as with other document files, content may include embedded links or macros in some environments; it is less common than standard OpenDocument text formats.

Safe

Magic Bytes

Offset 0
50 4B

Sources: Apache Tika

Extension

.oth

MIME Type

application/vnd.oasis.opendocument.text-web

Byte Offset

0

Risk Level

Safe

Validation Code

How to validate .oth files in Python

Python 
def is_oth(file_path: str) -> bool:
    """Check if file is a valid OTH by magic bytes."""
    signature = bytes([0x50, 0x4B])
    with open(file_path, "rb") as f:
        return f.read(2) == signature

How to validate .oth files in Node.js

Node.js 
function isOTH(buffer: Buffer): boolean {
  const signature = Buffer.from([0x50, 0x4B]);
  return buffer.subarray(0, 2).equals(signature);
}

How to validate .oth files in Go

Go 
func IsOTH(data []byte) bool {
    signature := []byte{0x50, 0x4B}
    if len(data) < 2 {
        return false
    }
    return bytes.Equal(data[:2], signature)
}

API Endpoint

GET /api/v1/oth
curl https://filesignature.org/api/v1/oth

See the full API documentation for all endpoints and parameters.

Frequently Asked Questions

What is a .oth file?

A .oth file is identified by the magic bytes 50 4B at byte offset 0. OpenDocument Text Web (OTH) is an OASIS-maintained file format in the OpenDocument family, used for web-oriented text documents. It is used for publishing lightweight documents that can be opened by office suites and other OpenDocument-compatible applications, including LibreOffice and Apache OpenOffice. The format is generally safe, though as with other document files, content may include embedded links or macros in some environments; it is less common than standard OpenDocument text formats.

What are the magic bytes for .oth files?

The magic bytes for OTH files are 50 4B at byte offset 0. These bytes uniquely identify the file format regardless of the file extension.

How do I validate a .oth file?

To validate a .oth file, read the first bytes of the file and compare them against the known magic bytes (50 4B) at offset 0. This is more reliable than checking the file extension alone, as extensions can be renamed.

What is the MIME type for .oth files?

The primary MIME type for .oth files is application/vnd.oasis.opendocument.text-web.

Is it safe to open .oth files?

OTH (.oth) 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.