How to open a .UDF file online
No burning, no mounting, no extra software to install.
Pick your .UDF file
Drag it in or click to choose it. It opens here in seconds.
See what's on it
Read the volume name, when it was made, the file systems it uses and whether it can start a computer.
Browse and save
Step through the folders, preview text and images, and download any single file you need.
About .UDF files
What a .UDF file is, and where it comes from.
A UDF file is a disc image whose contents use the Universal Disk Format file system, the same file system used on DVDs and Blu-ray discs. On Windows 8 and later, rename it to .iso and right-click > Mount; on macOS, double-click to mount. Older databases list it as a Windows NT uniqueness database file, which is a different, obsolete text file that shares this extension.
Programs that open .UDF files
| Full name | Universal Disk Format disc image |
|---|---|
| Developer | OSTA (Optical Storage Technology Association) / ECMA-167 |
| First released | UDF spec from OSTA, 1995; based on ECMA-167. Common for DVD/Blu-ray images. |
| Category | Archives |
| MIME type | application/x-udf-image |
| Signature | 4E 53 52 30 "NSR0" - UDF NSR descriptor (NSR02/NSR03), in the Volume Recognition Sequence |
Related viewers
Open what you find on the disc.
Can I open a 4 GB+ .UDF file?
Yes. The viewer never loads the whole file. It reads the disc's directory structure piece by piece, so even large DVD and Blu-ray images open in a second.
How do I know if an ISO is bootable?
Look at the Boot panel. If the image has an El Torito boot record, we show whether it boots on classic BIOS PCs, on UEFI computers, or both.
I have a .bin and a .cue file. Which one do I open?
Open the .bin file: it holds the data. The .cue file is a small text file describing the tracks; drop it on its own to see the track list.
Can I browse a virtual machine disk (VHD, VMDK)?
Today we show the disk details and partition table. Browsing NTFS, ext4 and other file systems inside virtual disks is on our roadmap.
Is anything uploaded?
No. Your .UDF file is read directly from your device by your browser.
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