ISO to GZ converter
A free ISO to GZ converter for ISO 9660 Disc Image files. Browser-based pairs here usually run in this tab, with no file upload.
Drop your ISO files here
or browse your device · paste with Ctrl+V
Accepts .iso, .img files. You can queue several files; each is processed one after another on your own device.
Your files never leave this device — there is no upload and no server to delete them from.
- 01
Add your ISO files
Drop them onto the box above or click to browse. They are read straight from disk — nothing is sent anywhere.
- 02
Check the settings
GZ is already selected. Open the gear icon on any row if you want to change quality, dimensions or codec before converting.
- 03
Download your GZ
Press convert and wait for the row to finish. Convert several files and you can take them all as a single ZIP.
ISO
ISO 9660 Disc ImageA byte-for-byte image of an optical disc, including its filesystem and boot sector. Uncompressed by design, since the point is to reproduce the original disc exactly.
- Developed by
- ISO/IEC
- Released
- 1988
- Extension
- .iso, .img
- MIME type
- application/x-iso9660-image
- Compression
- Uncompressed
- Specification
- Open
GZ
GzipA single-file DEFLATE compressor, fast enough that the entire web uses it to compress HTTP responses on the fly. It cannot bundle multiple files on its own — that is what the .tar.gz pairing is for.
- Developed by
- Jean-loup Gailly / Mark Adler
- Released
- 1992
- Extension
- .gz, .gzip
- MIME type
- application/gzip
- Compression
- Lossless
- Specification
- Open
- ISO and GZ are both archive formats, so this repacks the same set of files into a different container — each file's contents pass through unchanged. Only how they are grouped and compressed changes.
Questions about converting ISO to GZ
Is this ISO to GZ converter free?
Yes. Converting ISO to GZ here is free, with no account, no watermark and no daily quota. The work runs on your own device, so there is no server cost to pass on to you.
Is my ISO file uploaded anywhere?
For browser-based pairs, your file is read locally and converted by libarchive in this tab. No file payload is uploaded; you may still see analytics and engine downloads in network logs.
Is there a file-size limit for ISO to GZ?
There is no imposed upload cap when it runs in-browser, but each conversion still depends on your device and browser memory. Large videos are the first practical limit, then memory-heavy documents or images.
Can I convert several ISO files to GZ at once?
Yes. Drop in several files and each gets its own row; they are processed one after another on your device. You can download them one by one or as one ZIP.
Does ISO to GZ work on a phone, Mac or Chromebook?
Most modern browsers on Windows, macOS, Linux, ChromeOS, Android and iOS work. Very large videos are often more reliable on desktop or a browser with more memory.
Why do some conversions take longer on first run?
The conversion engine has to download first. Small codec bundles are fast, while ffmpeg is commonly 12–30 MB; later conversions of similar type use the cached engine.
I converted a file and the output is blank or unusable. What should I check?
Start over with default settings, then change one option at a time (quality, bitrate, page size, or codec) to isolate what changed behavior. If it keeps failing, retry with a smaller file and confirm the source format matches the pair.
Convert other formats to GZ
11 formats can become GZ here.
Convert ISO to other formats
A ISO file can become any of these.