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Header Byte Identification

Magic Byte Lookup

Paste the first bytes of a file as hex to find matching formats, MIME types, byte offsets, and risk levels. This lookup checks header signatures; trailer-only signatures are documented on their format pages.

Normalized input

50 4B 03 04

4 bytes checked.

Matching Formats

47 candidates matched the supplied bytes. Shared containers can produce multiple results.

.aar

AAR

Safe

application/java-archive

Matched Signature

50 4B 03 04
Offset 0
.apk

Android package

Safe

application/vnd.android.package-archive

Matched Signature

50 4B 03 04
Offset 0
.asice

ASICE

Safe

application/vnd.etsi.asic-e+zip

Matched Signature

50 4B 03 04
Offset 0
.asics

ASICS

Safe

application/vnd.etsi.asic-s+zip

Matched Signature

50 4B 03 04
Offset 0
.docx

Microsoft Office Open XML Format

Safe

application/vnd.openxmlformats-officedocument.wordprocessingml.document

Matched Signature

50 4B 03 04
Offset 0
.epub

Open Publication Structure eBook file

Safe

application/epub+zip

Matched Signature

50 4B 03 04
Offset 0
.ibooks

IBOOKS

Safe

application/x-ibooks+zip

Matched Signature

50 4B 03 04
Offset 0
.ipa

IPA

Safe

application/octet-stream

Matched Signature

50 4B 03 04
Offset 0
.jar

Java archive; compressed file package for classes and data

High

application/java-archive

Matched Signature

50 4B 03 04
Offset 0
.kmz

Google Earth saved working session file

Safe

application/vnd.google-earth.kmz

Matched Signature

50 4B 03 04
Offset 0
.kwd

KWord document

Safe

application/vnd.kde.kword

Matched Signature

50 4B 03 04
Offset 0
.maff

MAFF

Safe

application/x-maff

Matched Signature

50 4B 03 04
Offset 0
.msix

MSIX

Safe

application/msix

Matched Signature

50 4B 03 04
Offset 0
.odp

OpenDocument text document

Safe

application/vnd.oasis.opendocument.presentation

Matched Signature

50 4B 03 04
Offset 0
.ods

OpenDocumentSpreadsheet

Safe

application/vnd.oasis.opendocument.spreadsheet

Matched Signature

50 4B 03 04
Offset 0
.odt

OpenDocument text document

Safe

application/vnd.oasis.opendocument.text

Matched Signature

50 4B 03 04
Offset 0
.ott

OpenDocument text document

Safe

application/vnd.oasis.opendocument.text-template

Matched Signature

50 4B 03 04
Offset 0
.oxps

Microsoft Open XML paper specification file

Safe

application/oxps

Matched Signature

50 4B 03 04
Offset 0
.pk3

PK3

Safe

application/octet-stream

Matched Signature

50 4B 03 04
Offset 0
.pk4

PK4

Safe

application/octet-stream

Matched Signature

50 4B 03 04
Offset 0
.pptx

Microsoft Office Open XML Format

Safe

application/vnd.openxmlformats-officedocument.presentationml.presentation

Matched Signature

50 4B 03 04
Offset 0
.sxc

OpenOffice spreadsheet

Safe

application/vnd.sun.xml.calc

Matched Signature

50 4B 03 04
Offset 0
.sxd

OpenOffice spreadsheet

Safe

application/vnd.sun.xml.draw

Matched Signature

50 4B 03 04
Offset 0
.sxi

OpenOffice spreadsheet

Safe

application/vnd.sun.xml.impress

Matched Signature

50 4B 03 04
Offset 0
.sxw

OpenOffice spreadsheet

Safe

application/vnd.sun.xml.writer

Matched Signature

50 4B 03 04
Offset 0
.usdz

USDZ

Safe

model/vnd.usdz+zip

Matched Signature

50 4B 03 04
Offset 0
.vsdx

VSDX

Safe

application/vnd.ms-visio.drawing

Matched Signature

50 4B 03 04
Offset 0
.whl

WHL

Safe

application/zip

Matched Signature

50 4B 03 04
Offset 0
.wmz

Windows Media compressed skin file

Safe

application/x-ms-wmz

Matched Signature

50 4B 03 04
Offset 0
.xlsx

Microsoft Office Open XML Format

Safe

application/vnd.openxmlformats-officedocument.spreadsheetml.sheet

Matched Signature

50 4B 03 04
Offset 0
.xpi

Mozilla Browser Archive

Safe

application/x-xpinstall

Matched Signature

50 4B 03 04
Offset 0
.xps

XML paper specification file

Safe

application/vnd.ms-xpsdocument

Matched Signature

50 4B 03 04
Offset 0
.xpt

SAS Transport File

Safe

application/x-sas-xport

Matched Signature

50 4B 03 04
Offset 0
.zip

PKSFX self-extracting executable compressed file

Safe

application/zip

Matched Signature

50 4B 03 04
Offset 0
.zipx

ZIPX

Safe

application/zip

Matched Signature

50 4B 03 04
Offset 0
.odc

ODC

Safe

application/vnd.oasis.opendocument.chart

Matched Signature

50 4B
Offset 0
.odf

ODF

Safe

application/vnd.oasis.opendocument.formula

Matched Signature

50 4B
Offset 0
.odft

ODFT

Safe

application/vnd.oasis.opendocument.formula-template

Matched Signature

50 4B
Offset 0
.odg

ODG

Safe

application/vnd.oasis.opendocument.graphics

Matched Signature

50 4B
Offset 0
.odi

ODI

Safe

application/vnd.oasis.opendocument.image

Matched Signature

50 4B
Offset 0
.otc

OTC

Safe

application/vnd.oasis.opendocument.chart-template

Matched Signature

50 4B
Offset 0
.otg

OTG

Safe

application/vnd.oasis.opendocument.graphics-template

Matched Signature

50 4B
Offset 0
.oth

OTH

Safe

application/vnd.oasis.opendocument.text-web

Matched Signature

50 4B
Offset 0
.oti

OTI

Safe

application/vnd.oasis.opendocument.image-template

Matched Signature

50 4B
Offset 0
.otm

OTM

Safe

application/vnd.oasis.opendocument.text-master

Matched Signature

50 4B
Offset 0
.otp

OTP

Safe

application/vnd.oasis.opendocument.presentation-template

Matched Signature

50 4B
Offset 0
.ots

OTS

Safe

application/vnd.oasis.opendocument.spreadsheet-template

Matched Signature

50 4B
Offset 0