ISO to GZ Converter
Processing entirely on your device — large files may take a moment.
ISO Disc Image and Gzip Compressed File exist for different jobs: ISO is a sector-for-sector copy of an optical disc — Linux distributions, old software and game discs all ship as ISO files. Unpack a .gz into a normal file or repack it as ZIP/TAR when the receiving tool does not understand gzip.
Because the whole conversion happens on your device, it is instant, unlimited and genuinely private — no accounts, no watermarks, no files on anyone's server. Multiple files are converted in one go.
How ISO compares to GZ
| ISO | GZ | |
|---|---|---|
| Compression | None (raw disc sectors) | DEFLATE |
| Bundling | Full disc image | Single file |
| Best for | Disc distribution and archival | Logs, dumps, datasets |
How to convert ISO to GZ
- 1
Select your files
Select your ISO file.
- 2
Convert instantly
The file bytes are gzip-compressed in place — the same archive your server or build tool produces, made locally.
- 3
Download results
Download the .gz file — ready to upload, serve or attach.
About the ISO format
ISO is a sector-for-sector image of an optical disc: the entire contents of a CD or DVD, byte-identical, in one file. Linux distributions are distributed as ISOs, old game discs are archived as ISOs, and virtual machines mount them as virtual drives.
You cannot simply double-click one open. The usual choices are burning it, mounting it, or — the undemanding option — extracting the files inside to a ZIP, which works everywhere and needs no drive at all.
+Strengths
- ✓Byte-faithful disc copies
- ✓The distribution format of Linux and retro media
- ✓Mounts as a virtual drive everywhere
!Limitations
- −Not directly openable — needs mounting or extraction
- −Contains the full disc, including emptiness
About the GZ format
A .gz file is one file squeezed by gzip — not an archive. kernel.org tarballs are “tar inside gz”, but plenty of logs, JSON dumps and CSV exports travel as plain .gz. Opening one means decompressing it back to the original bytes.
Repacking into ZIP or TAR gives the decompressed file a container that every GUI tool opens without a second thought.
+Strengths
- ✓Everywhere on Linux and macOS
- ✓Fast, well-understood compression
- ✓Streams natively from any tool
!Limitations
- −Single file only — no directory tree
- −No encryption or integrity metadata
Why convert ISO to GZ?
Think of it as moving your file to the container that fits the job. Not directly openable — needs mounting or extraction GZ works differently: Everywhere on Linux and macOS If any of that sounds like your task, run the conversion — it takes seconds and nothing leaves your device.
Frequently asked questions
Is this ISO to GZ converter really free?
Yes — completely free, with no sign-up, no watermark and no daily conversion limits. The site is supported by advertising.
Are my files uploaded to a server?
No. The conversion runs entirely inside your browser using WebAssembly, so your files never leave your device — that is what makes it instant and private.
Does it work on Windows, Mac, iPhone and Android?
Yes. Anything with a modern browser works: Windows, macOS, Linux, Android and iOS. No software installation is required.
Is there a file size limit for ISO to GZ?
The only limit is your device's memory, since nothing is uploaded. Files up to a few hundred megabytes work fine on a modern desktop browser; very large files simply take a little longer.
Is there a size limit for archive conversion?
There is no upload cap because nothing is uploaded — the practical limit is your device memory. A few hundred megabytes of unpacked content works comfortably on a modern computer.
Are the files inside my ISO archive modified?
No. Contents are unpacked in memory and repacked into GZ byte-for-byte — the conversion changes the container, never the files inside it.