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OTP (.otp)

.otp file signature | application/vnd.oasis.opendocument.presentation-template

OpenDocument Presentation Template (OTP) is a template file format defined and maintained by OASIS as part of the OpenDocument family. It is used by applications such as LibreOffice, Apache OpenOffice, and related office suites to create reusable presentation layouts, styles, and default content. The format is generally safe to open, though like other office templates it may contain embedded objects or macros in some implementations.

Safe

Magic Bytes

Offset 0
50 4B

Sources: Apache Tika

Extension

.otp

MIME Type

application/vnd.oasis.opendocument.presentation-template

Byte Offset

0

Risk Level

Safe

Validation Code

How to validate .otp files in Python

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

How to validate .otp files in Node.js

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

How to validate .otp files in Go

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

API Endpoint

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

See the full API documentation for all endpoints and parameters.

Related Formats

.odp .pot .pps .ppt .pptx .key

Frequently Asked Questions

What is a .otp file?

A .otp file is identified by the magic bytes 50 4B at byte offset 0. OpenDocument Presentation Template (OTP) is a template file format defined and maintained by OASIS as part of the OpenDocument family. It is used by applications such as LibreOffice, Apache OpenOffice, and related office suites to create reusable presentation layouts, styles, and default content. The format is generally safe to open, though like other office templates it may contain embedded objects or macros in some implementations.

What are the magic bytes for .otp files?

The magic bytes for OTP 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 .otp file?

To validate a .otp 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 .otp files?

The primary MIME type for .otp files is application/vnd.oasis.opendocument.presentation-template.

Is it safe to open .otp files?

OTP (.otp) 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.