OpenAnyFile
What is a .qcow2 file?
QEMU Copy-On-Write v2 Disk is a disk image format developed by QEMU, first released in 2008. It is usually created by QEMU, KVM, Proxmox.
A sparse disk image that grows as data is written, with snapshots inside the file.
File details
| Full name | QEMU Copy-On-Write v2 Disk |
|---|---|
| Category | Disk images |
| MIME type | application/x-qemu-disk |
| Signature (magic bytes) | 51 46 49 FB (QFI) |
| Developer | QEMU |
| Introduced | 2008 |
| Opens with | Universal inspector |
| Uploaded? | No — read locally in your browser |
How to open a .qcow2 file
OpenAnyFile routes .qcow2 files to its universal inspector, which shows a hex view, the detected signature, checksums and any readable text.
- Drop your .qcow2 file on the box above, click it to choose the file, or paste it with Ctrl+V.
- The real format is detected from the file's first bytes — not just its name.
- The file opens in the universal inspector.
- Use fullscreen for a closer look, check its checksums, or download it back unchanged.
What works — and what does not
Works
Viewing and inspecting: a hex view, the detected signature, checksums and any readable text. Size, type, signature and checksums are always shown.
Does not work
A rendered view. This format has no open decoder, so you get a byte-level inspection and readable text instead.
Is it safe to open a .qcow2 file online?
Here, yes — because nothing is uploaded. Most "online viewers" send your file to their server. OpenAnyFile reads it with your browser's File API and decodes it on your own device, so there is no copy anywhere else. You can check: open your browser's network tab while opening a file — no upload appears.
Questions about .qcow2 files
Can I open a .qcow2 file without installing software?
Yes. OpenAnyFile opens .qcow2 files in your browser using its universal inspector. You get a hex view, the detected signature, checksums and any readable text, with nothing installed and no account.
How do I know a file is really a .qcow2 file?
Check its first bytes instead of its name. A genuine QCOW2 file begins with 51 46 49 FB (QFI). OpenAnyFile shows the detected type, so a renamed file is easy to spot.
Is my .qcow2 file uploaded anywhere?
No. The file is read locally by your browser and never sent to a server — it even works offline once the page has loaded.
Does it work on phones?
Yes — on Android and iPhone, in any modern browser. You can also install OpenAnyFile as an app.
Related formats
Other formats from the same family:
Format facts checked and page updated on September 25, 2026.