Online .ISO File Extractor
(No Size Limits)
Open and unpack compressed folders instantly in any web browser. Perfect for Chromebooks, school laptops, and managed devices where software installation is locked.
About Decompression of ISO
An .ISO file is a sector-by-sector copy of an optical disc. It is not compressed, which is why a 4 GB ISO holds roughly 4 GB of files. Operating system installers, game discs and software distributions are almost always shipped this way, and most of the time you want two files out of it rather than the whole disc.
You do not need to burn or mount it
The usual advice is to burn the image to a disc or mount it as a virtual drive. Both are unnecessary if you only want the contents. An ISO is a filesystem in a file, so it can simply be read and its entries copied out, which is what happens here.
| System | Can open an ISO without extra software | What to do |
|---|---|---|
| Windows 10 and 11 | Yes, by mounting it | Right-click, Mount, then copy files out |
| macOS | Yes, by mounting it | Double-click to mount it as a volume |
| ChromeOS | No | Extract on this page |
| Linux | With a mount command and permissions | sudo mount -o loop image.iso /mnt |
Mounting needs permission to mount a volume, which is exactly what a managed laptop, a school Chromebook or a locked-down work machine will not give you. That is the gap this page fills.
Why raw CD rips break most online ISO tools
ISO 9660 addresses everything in 2048-byte logical sectors, and the volume descriptor that describes the disc always begins at logical sector 16. A naive reader multiplies those numbers, looks at byte 32768, and reads the descriptor from there.
That works for a plain .iso and fails for anything ripped raw from a CD. Raw rips keep each sector's sync pattern, address header and error-correction bytes, so the 2048 bytes of actual payload sit inside a larger physical sector. Logical sector 16 is no longer at byte 32768, and a reader that assumes it is finds nothing and reports the image as corrupt.
The layouts differ only in how much header precedes the payload. Mode 1 carries 12 bytes of sync plus a 4-byte address header. Mode 2 Form 1 adds an 8-byte subheader. The 2448-byte variants are those again with 96 bytes of subchannel data appended to every sector. Rather than assume, this extractor probes the plausible geometries in order and works out where the payload actually starts, so raw rips open the same as clean images.
Large images
ISOs are big by nature and nothing here is held in memory. The image is read in chunks and each file is written out as it is found, so a 3.9 GB image containing 7,138 files extracts without the tab running out of memory. There is no size ceiling to hit.
What does not work
UDF-only images, which some newer DVD and Blu-ray discs use instead of ISO 9660, are not supported yet. Neither are multi-volume sets split across several files. If an image fails, the error names the real cause rather than blaming its size.
Related reading
ISO FAQ
Everything you need to know about how unpk.app processes ISO locally.
What is an ISO file?
An ISO file is a sector-by-sector digital copy of an optical disc (CD, DVD, or Blu-ray). It bundles every file and folder from that disc into a single archive, commonly used for OS installers, game discs, and software distributions.
Can I open an ISO file without burning it to a disc?
Yes. With unpk.app you can extract individual files from any ISO directly in your browser - no disc, no burning software, no virtual drive mounting required. Just drop the ISO and browse its contents instantly.
How do I open an ISO file on a Chromebook?
ChromeOS can mount ISO files natively in newer versions - try double-clicking it in the Files app. If that does not work, drop the ISO into unpk.app in Chrome to extract files directly without any app install.
How do I extract specific files from an ISO without extracting everything?
With unpk.app, you can browse all contents of an ISO file and download only the specific files you need. You do not have to extract the entire disc image - just click on any individual file inside to save it.
Is there a file size limit for ISO files?
No. unpk.app uses streaming extraction, so even very large ISO files (such as full operating system installers that are 4GB+) can be opened without hitting any size limit and without crashing your browser.