Files with isz extension can be most often encountered as compressed disk image files from the makers of UltraISO. It's a somewhat rare file format and most programs do not support it.

Detailed description

Software that open isz file

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ISZ file extension - UltraISO compressed disk image

What is isz file? How to open isz files?

File extension isz is associated with a compressed disk image file format developed by EZB Systems, creators of the UltraISO application that is used as burning application and disk image manager.

The ISZ stands for "ISO Zipped". It is ISO disk image compressed by ZLIB or BZIP2 compression file format. ISZ file format also supports AES encryption. ISZ is public format and it can be opened in various third party applications.

Updated: November 9, 2023

The default software associated to open isz file:

UltraIso icon

EZB Systems, Inc. logoUltraIso  Microsoft Windows software

Company or developer:
EZB Systems, Inc.

UltraISO is popular creating, editing and converting tool of ISO CD/DVD disk images. It allows users to directly edit ISO images, extract files from ISO images, create images from CD/DVD-ROM, create bootable ISO image etc.

UltraISO supports many ISO file formats such as ISO, BIN, IMG, CIF, NRG, BWI and so on. Also can converts them to standard ISO format.

Alcohol 120% icon

Alcohol Soft logoAlcohol 120%  Microsoft Windows software

Company or developer:
Alcohol Soft

Alcohol 120% is an optical disc authoring program and disk image emulator created by Alcohol Soft. Alcohol 120% supports a wide range of common CD/DVD images.

Daemon Tools icon

DT Soft Ltd logoDaemon Tools  Microsoft Windows software

Company or developer:
DT Soft Ltd

DAEMON Tools is an advanced application for Microsoft Windows that offers users one of the best optical media emulation capability in the industry.

With DAEMON Tools you can convert your physical CD/DVD disks into "virtual disks" so called "images". It also can emulate up to 4 virtual CD/DVD drives, so you can mount (insert) and unmount (eject) images. 

AnyToISO icon

CrystalIdea Software Inc. logoAnyToISO  Microsoft Windows software

Company or developer:
CrystalIdea Software Inc.

AnyToISO is disk image converting tool. It is able to extract and convert variety of popular disk image formats, such as NRG, MDF, UIF, DMG, BIN, DAA to ISO disk image format. It is available in ten languages.

AnyToISO for Mac icon

CrystalIdea Software Inc. logoAnyToISO for Mac  Apple macOS / Mac OS X software

Company or developer:
CrystalIdea Software Inc.

AnyToISO for Mac is disk image converter. It is able to convert popular disk image formats, such as NRG, MDF, UIF, DMG, ISZ, BIN, DAA to ISO standard disk image format.

DAEMON Tools for Mac icon

DT Soft Ltd logoDAEMON Tools for Mac  Apple macOS / Mac OS X software

Company or developer:
DT Soft Ltd

DAEMON Tools for Mac is software solution for mounting CD/DVD/HDD disk images. It is able to mount *.b5t, *.b6t, *.bwt, *.ccd, *.cdi, *.bin/*.cue, *.ape/*.cue, *.flac/*.cue, *.iso, *.isz, *.mds/*.mdf, *.mdx, *.nrg, *.pdi, *.dmg, *.vhd files.

Related articles:

Convert ISZ to ISO

Help how to open:

The ISZ disk image file format is primary associated with UltraISO. UltraISO is an ISO CD/DVD image file creating/editing/converting tool. UltraISO can open, create and edit ISZ disk image file.

The ISZ compressed disk image is supported by third party applications, such as Alcohol 120%. Alcohol 120% can open ISZ file or burn it on CD/DVD medium. Also can mount ISZ disk image file into Alcohol 120% virtual CD/DVD drive.

How to convert:

UltraISO supports other ISO disk image formats such as .ISO, .BIN, .IMG, .CIF, .NRG, .BWI and etc. UltraISO can convert ISZ format into another formats, that it supports.

Alcohol 120% also supports ISZ compressed disk image file format and can convert it to another disk image file formats, that Alcohol 120% supports.

Find conversions from isz file:

isz to img

isz to iso

isz to mdf

isz to mdx

isz to rar

isz to uif

isz to zip

Find converter to isz file type:

000 to isz

dmg to isz

iso to isz

mdf to isz

mou to isz

nrg to isz

uif to isz

File identification strings:

HEX code: 49 73 5A 21
ASCII code: IsZ!

Related links:

ISZ file format specification

List of software applications associated to the .isz file extension

Recommended software programs are sorted by OS platform (Windows, macOS, Linux, iOS, Android etc.)
and possible program actions that can be done with the file: like open isz file, edit isz file, convert isz file, view isz file, play isz file etc. (if exist software for corresponding action in's database).

Click on the tab below to simply browse between the application actions, to quickly get a list of recommended software, which is able to perform the specified software action, such as opening, editing or converting isz files.

Software that open isz file - UltraISO compressed disk image

Programs supporting the exension isz on the main platforms Windows, Mac, Linux or mobile. Click on the link to get more information about listed programs for open isz file action.

Microsoft Windows:

Main software associated with isz file by default:
UltraIso small icon UltraIso
Alcohol 120% small icon Alcohol 120%
Daemon Tools small icon Daemon Tools
Other suggested software:
WinMount small icon WinMount
Astroburn small icon Astroburn

Apple macOS / Mac OS X:


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