Free online ISO to VMDK converter
Learn why ISO and VMDK differ and how to use an ISO to create a VMware disk.
Convert ISO to VMDK online - free
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How to convert iso to vmdk file
- Virtualization
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Source format: ISO
ISO is a disc image format that stores the contents of an optical disc, usually a CD, DVD, or Blu-ray, in a single file. It is commonly used for software distribution, operating system installers, recovery media, and archival copies of disc-based content.
An ISO file preserves the file structure of the disc, but it is still a read-only image of optical media. It is not a virtual hard disk and does not contain the partition layout, boot sectors, or disk geometry expected by most virtual machine platforms.
Target format: VMDK
VMDK is a virtual disk format used by VMware products and supported by many other virtualization tools. It represents a hard drive for a virtual machine and can store partitions, boot sectors, operating systems, and data just like a physical disk.
The main advantage of VMDK is that it is designed for bootable virtual machines and can be attached directly to VMware Workstation, VMware Fusion, and ESXi. It is the right format when you want a VM to boot from a disk image rather than mount a disc image.
Can ISO be converted to VMDK?
ISO to VMDK is not a simple one-step conversion in the usual sense. An ISO is a disc image, while a VMDK is a virtual hard disk. In most cases, you do not convert an ISO directly into a usable VMDK. Instead, you attach the ISO as a virtual CD/DVD and install the operating system or software onto a new VMDK.
This is the correct workflow when the ISO is an installer, recovery image, or live environment. The ISO acts as the source media, and the VMDK becomes the destination disk for the installed system.
Best practical method
- Open your virtualization software, such as VMware Workstation, VMware Fusion, or ESXi.
- Create a new virtual machine.
- When prompted for installation media, choose the ISO file as the virtual optical drive.
- Create a new virtual disk in VMDK format for the VM.
- Boot the VM and install the operating system or software from the ISO onto the VMDK.
- After installation, detach the ISO if it is no longer needed.
Using VMware Workstation
- Start VMware Workstation and choose File → New Virtual Machine.
- Select Typical or Custom setup.
- Choose Installer disc image file (iso) and browse to the ISO.
- When asked for a virtual disk, keep the default VMware disk type, which is VMDK.
- Finish the wizard and start the VM.
Using command-line tools
If you already have a virtual disk image and need to convert between disk formats, tools such as qemu-img can convert many virtual disk types to VMDK. However, qemu-img does not directly turn a standard ISO into a meaningful bootable VMDK; it is mainly useful for converting actual disk images such as .vdi, .qcow2, or raw images into .vmdk.
Example for supported disk-image conversion:
qemu-img convert -O vmdk source.img destination.vmdk
This works for disk images, not for ordinary optical-disc ISO files.
When a direct conversion may be possible
In rare cases, if an ISO contains a full disk image rather than a normal installer disc, you may be able to extract or write its contents into a virtual disk using specialized tools. Even then, the result is usually not a true format conversion but a reconstruction of a bootable virtual disk. Success depends on the ISO structure, bootloader, and partitioning.
For most users, the safest and most compatible approach is to treat the ISO as installation media and the VMDK as the destination disk.
Using the built-in converter on 101convert.com
You can convert the file on 101convert.com for free, without installing any software. This is convenient for supported image workflows, but remember that ISO-to-VMDK usually means creating a VM disk from the ISO rather than performing a direct file transformation.
Compatibility and limitations
ISO and VMDK serve different purposes, so direct conversion is often limited or not appropriate. An ISO is typically read-only and optimized for distribution, while a VMDK is a writable virtual hard disk. If your goal is to boot an operating system in VMware, the best result usually comes from installing from the ISO onto a new VMDK.
Compatibility depends on the hypervisor. VMware uses VMDK natively, while other platforms may prefer formats such as VDI or QCOW2. Also, some ISO files are not bootable and contain only application files; these cannot be meaningfully transformed into a system disk image.
If the ISO contains a live system or recovery environment, you may be able to use it to create a bootable VM, but the resulting VMDK will depend on the installation process, partitioning, and bootloader setup.
ISO vs VMDK: format comparison
How the ISO and VMDK formats compare on the properties that matter most for this conversion.
| Property | .ISO ISO 9660 disc image | .VMDK Virtual Machine Disk |
|---|---|---|
| Compression | Uncompressed | Both |
| Encryption | No | — |
| Split archives | — | Yes |
| Bootable | Yes | Yes |
| Operating system support | Wide | Wide |
| Typical file size | Very large | Very large |
| Open standard | Yes | Partly open |
| Introduced | 1988 | 1998 |
| Developer | ISO / ECMA / optical disc industry | VMware |
| MIME type | application/x-iso9660-image | application/x-vmdk |
Suggested software and links: iso to vmdk converters
Frequently asked questions
Is the ISO to VMDK converter free?
Yes, converting ISO to VMDK on 101convert.com is completely free. No registration, email address or installation is required. If you need a higher file size limit or want to convert more files at once, see our plans.
How large can my ISO file be?
You can upload ISO files up to 2000 MB and convert up to 1 files at once in a single batch.
What happens to my uploaded files?
Files are processed automatically and deleted from our servers within a few minutes after conversion. We never view or share your files.
Do I need to install any software to convert ISO to VMDK?
No. The ISO to VMDK conversion runs entirely online in your browser and works on Windows, Mac, Linux, Android and iPhone.
Did the conversion fail?
In most cases, the cause is an incorrect file format. Please upload a valid ISO file for this ISO to VMDK conversion. Occasionally, the issue may be on our side. We analyze recurring conversion failures and disable or fix the converter if we detect a defect.
What is the difference between an ISO and a VMDK file?
An ISO is an image of optical-disc media, while a VMDK is a virtual hard-disk image. They use different disk structures, so converting between them changes how the data is presented to a virtual machine.
Why does my converted ISO-to-VMDK disk not boot?
A converted disk may not boot because an ISO is designed as read-only optical media, not as a bootable hard disk. Missing partition information, boot code, or an operating-system installation can cause a virtual machine to show a boot error even when the ISO itself was bootable.
Will an ISO-to-VMDK conversion keep the same size and contents?
The VMDK size depends on how the virtual disk is created and whether it is sparse or fully allocated, so it may differ from the ISO's size. Files and boot data may be copied, but ISO-specific read-only structure and some disc metadata are not preserved as the same kind of virtual-disk structure.