QOI to MAT Converter
Processing entirely on your device — large files may take a moment.
Convert MAT image arrays to PNG for reports and previews. If your files are still in QOI format, this page is the shortcut: QOI (Quite OK Image) is a 2022 lossless format with a ~200-line spec — PNG-class simplicity that compresses similarly fast.
iLoveConverter processes everything locally on your computer, which makes it private and fast: no upload wait, no server storage, no limits. Add as many files as you like — batch conversion is built in.
How QOI compares to MAT
| QOI | MAT | |
|---|---|---|
| Compression | Lossless (RLE/delta) | None / zlib level 9 |
| Transparency | Supported | Not supported |
| Animation | Not supported | Not supported |
| Metadata | None | Variable names and workspace metadata |
| Best for | Hobby engines, lossless simplicity | Simulation frames, sensor arrays |
How to convert QOI to MAT
- 1
Select your files
Drag & drop your QOI files onto the area above, or click to browse. You can add multiple files at once for batch conversion.
- 2
Convert instantly
Click "Convert to MAT". The conversion runs entirely inside your browser using WebAssembly — no upload, no queue, no waiting.
- 3
Download results
Download each converted MAT file individually, or grab everything at once as a ZIP archive.
About the QOI format
QOI (Quite OK Image, 2021) is a lossless format defined in one short specification document: a stream of simple run-length and delta ops over linear pixels. An encoder fits in 300 lines, decodes faster than PNG, and compresses comparably for photographic content.
It has found a home in emulators, demoscene projects and hobby engines — anywhere people want images without a codec dependency. Viewers rarely support it, so converting QOI to PNG is the way to bring these files into normal tools.
+Strengths
- ✓Radically simple spec (~200 lines)
- ✓Lossless with fast decode
- ✓No patent or licensing questions
!Limitations
- −Almost no viewer support
- −Larger than modern codecs for many images
About the MAT format
MAT is the workspace format of MATLAB and its open-source sibling Octave. Image data shows up inside MAT files as numeric arrays — simulation frames, sensor captures, processed microscopy — usually alongside the variables and metadata a research script produced with them.
Converting the image arrays inside a MAT file to PNG makes them viewable and shareable without MATLAB — useful for reports, papers and collaborations where colleagues do not have a MATLAB license.
+Strengths
- ✓Carries numeric precision end to end
- ✓Pairs image data with research variables
- ✓Octave compatibility (open tooling)
!Limitations
- −Requires MATLAB/Octave to open
- −Not an image container by design
Why convert QOI to MAT?
There is a concrete reason this conversion exists: Almost no viewer support MAT sidesteps that — Carries numeric precision end to end If that is your situation, the tool above settles it in seconds, entirely on your device.
Frequently asked questions
Is this QOI to MAT 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.
Will I lose quality converting QOI to MAT?
No — MAT is a lossless format, so every pixel of the converted image matches your original QOI file. You can also adjust the quality/size balance before converting when the target format supports compression.
Will transparent areas survive the conversion to MAT?
Transparency is kept whenever MAT actually supports an alpha channel. If the target format has none (like JPG), transparent areas are flattened onto a white background — that is a property of the format, not of this tool.
Can I convert several QOI files at once?
Yes — drop as many files as you like into the tool and they are converted in one batch. When more than one file comes out, everything is bundled into a ZIP for a single download.