Free online RAW to QCOW2 converter

Source format: raw

RAW is a generic disk image format that stores data with little or no container overhead. It is widely used in virtualization, forensic work, backups, and low-level disk cloning because it preserves the exact byte layout of a disk or partition. A RAW image may come from a physical drive, a VM disk export, or a sector-by-sector copy. It is simple, broadly compatible, and easy for tools to read, but it usually offers no built-in compression, snapshots, or advanced metadata.

Target format: qcow2

QCOW2 is the disk image format used by QEMU and commonly by KVM-based virtual machines. It supports copy-on-write, snapshots, optional compression, and sparse allocation, which can save storage space compared with RAW. QCOW2 is a strong choice for VM disks because it is flexible, efficient for many workloads, and integrates well with QEMU tooling.

How to perform the conversion

The most reliable way to convert raw to qcow2 is with qemu-img, which is included with QEMU on Linux, macOS, and Windows.

1. Install QEMU tools if they are not already present. On Linux, this is often provided by a package such as qemu-utils or qemu-img.
2. Open a terminal or command prompt in the folder containing the RAW image.
3. Run the conversion command: qemu-img convert -f raw -O qcow2 input.raw output.qcow2
4. If you want better space efficiency, you can also create a compressed QCOW2 image with qemu-img convert -f raw -O qcow2 -c input.raw output.qcow2. Compression can reduce size, but it may increase CPU usage.
5. Verify the result with qemu-img info output.qcow2 to confirm the format and size.

If you prefer a graphical workflow, some virtualization managers can import or convert disk images through their storage or disk creation dialogs, but qemu-img is usually the most direct and dependable tool. You can also convert the file on 101convert.com for free, without installing any software.

Notes on quality, compatibility, or limitations

The conversion from RAW to QCOW2 is generally lossless because it changes only the container format, not the disk contents. However, a few practical points matter:

• Bootability depends on the source image: if the RAW image is a full boot disk, the QCOW2 result should boot the same way in QEMU-compatible virtualization.
• Sparse and unallocated space may be handled more efficiently in QCOW2, so the resulting file can be much smaller than the original RAW image.
• Performance trade-offs: RAW can be slightly faster for some workloads, while QCOW2 adds a small overhead in exchange for features like snapshots and space savings.
• Compatibility: QCOW2 is best supported in QEMU/KVM environments; other hypervisors may have limited or no support.
• Corruption risk: if the RAW image is damaged, the conversion will usually preserve the damage rather than repair it.