QOI to JPC Converter
Processing entirely on your device — large files may take a moment.
Quite OK Image and JPEG 2000 Code Stream exist for different jobs: QOI (Quite OK Image) is a 2022 lossless format with a ~200-line spec — PNG-class simplicity that compresses similarly fast. Convert photos to JPC for streaming pipelines, or JPC back to JPG/PNG for everyday viewing.
This converter runs entirely in your browser using WebAssembly — your files never leave your device, nothing is uploaded, and there are no watermarks, sign-ups or queues. Drop in several files at once to convert them as a batch.
How QOI compares to JPC
| QOI | JPC | |
|---|---|---|
| Compression | Lossless (RLE/delta) | Wavelet (lossy + lossless) |
| Transparency | Supported | Supported |
| Animation | Not supported | Not supported |
| Metadata | None | None (bare codestream) |
| Best for | Hobby engines, lossless simplicity | Broadcast streams, archival pipelines |
How to convert QOI to JPC
- 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 JPC". The conversion runs entirely inside your browser using WebAssembly — no upload, no queue, no waiting.
- 3
Download results
Download each converted JPC 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 JPC format
JPC is JPEG 2000 stripped to its bare codestream: the same wavelet-compressed image data as JP2, minus the container boxes that give JP2 its metadata, color profiles and file signature. Broadcast and archival systems that stream codestreams directly (rather than storing boxed files) work with JPC.
Because there is no container, JPC carries no thumbnail, no EXIF and no declared colorspace — players must probe the codestream header itself. Converting JPC into JP2 restores a full container; converting to JPG or PNG produces an instantly viewable copy.
+Strengths
- ✓Wavelet compression, better per-byte quality than JPG
- ✓True lossless mode available
- ✓Streamable — no container parsing needed
!Limitations
- −No metadata, color profile or thumbnail
- −Browsers cannot open it at all
Why convert QOI to JPC?
Think of it as moving your file to the container that fits the job. Almost no viewer support JPC works differently: Wavelet compression, better per-byte quality than JPG If any of that sounds like your task, run the conversion — it takes seconds and nothing leaves your device.
Frequently asked questions
Is this QOI to JPC 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 JPC?
No — JPC 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 JPC?
Transparency is kept whenever JPC 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.
What happens to EXIF data and other metadata?
Conversions here re-encode the image, and re-encoding generally does not carry the original metadata over. If the EXIF data of your QOI files matters (camera model, GPS, timestamps), keep the original file as the master and treat the converted copy as the shareable version.