EXR to QOI Converter
Convert EXR to QOI in your browser. EXR files usually come from 3D renderers and compositing in Nuke, Blender, Houdini, After Effects and DaVinci Resolve; QOI is the better fit for fast lossless storage in games and tools. You get a lossless RGBA QOI file. Nothing is uploaded.
- Processed locally
- No upload, no wait
- No sign-up
- No watermark
Drop images here
or choose files · paste with Ctrl/⌘ V
EXR expected · other image formats also work
How to use EXR to QOI
- 1
Add your EXR files: drop them here, choose them, or paste from the clipboard.
- 2
There is nothing to tune: the QOI is written losslessly. Resizing and rotating are under More options if you need them.
- 3
Click Convert. Each file is decoded and encoded in a background thread on this device.
- 4
Download the .qoi files one at a time or together as a ZIP.
Why use Aback Images for exr to qoi
Where the QOI goes next
QOI opens in game engines, GIMP 3, ImageMagick, XnView MP and many small libraries.
QOI next to EXR
Both sides are lossless, so the size depends on how well the QOI encoder handles this picture compared with the EXR's none, RLE, ZIP, PIZ, PXR24, B44 or DWA, chosen per file.
Written without a lossy pass
The QOI is written losslessly, so the pixels decoded from the EXR arrive unchanged, apart from precision beyond 8 bits per channel.
Processed on your device
Your images are decoded, edited and encoded inside this browser tab by Web Workers. Nothing is uploaded to a server.
EXR vs QOI
What changes from EXR to QOI
Encoding: the EXR uses none, RLE, ZIP, PIZ, PXR24, B44 or DWA, chosen per file; QOI uses lossless, byte-aligned run, index, difference and literal codes, and the download is a lossless RGBA QOI file.
Bit depth: 16-bit half or 32-bit floating point per channel in the EXR; QOI allows 8 bits per channel, and the QOI written here has 8 bits per channel. Floating-point values are mapped to 8 bits per channel, and anything brighter than white clips.
Colour: scene-linear RGB, often ACEScg or linear Rec.709 in the EXR; QOI supports RGB or RGBA, tagged sRGB or linear, written here as 8-bit sRGB.
Transparency: the EXR stores it as an A channel stored like any other channel; the QOI keeps it as a full 8-bit alpha channel.
Other images: the EXR can hold extra channels (depth, normals, render passes) and multiple parts; only the main image is converted.
Metadata: the EXR can carry named header attributes such as chromaticities, timecode and camera data; QOI can carry none: a 14-byte header holds only size, channels and colour space, but nothing is copied across.
About EXR
OpenEXR is the high dynamic range format of film visual effects. It stores half or full floating-point channels in linear light, plus any extra render passes, and is the working format of compositing pipelines.
An EXR starts with the magic number 76 2F 31 01 and a version field, then a header of named, typed attributes (channels, compression, dataWindow, displayWindow) and a table of offsets to scanline or tile blocks.
EXR files usually come from 3D renderers and compositing in Nuke, Blender, Houdini, After Effects and DaVinci Resolve.
About QOI
QOI is a modern lossless format that encodes 20-50 times faster than PNG with similar file sizes. It is popular in games and tools that value speed and simplicity.
A QOI file is a 14-byte header ('qoif', width, height, channels, colour space), a stream of chunks that each encode a run, an index into 64 recently seen colours, a small difference from the previous pixel or a literal value, and an 8-byte end marker.
When converting EXR to QOI makes sense
QOI is the better choice for fast lossless storage in games and tools, while EXR suits visual effects, compositing and 3D render output.
QOI strengths: Extremely fast lossless encode and decode; Simple, open spec. Drawbacks to weigh: Not supported by browsers or mainstream apps.
Limitations
- EXR values are scene-linear and can exceed 1.0; they are mapped to display values without tone mapping, so highlights clip to white.
- Only the colour channels are converted; depth, normals and other render passes are dropped.
- Single-part scanline files are supported; tiled, deep and multi-part EXRs, and those compressed with B44 or DWA, cannot be read here.
- Browsers and most mainstream apps cannot open QOI; it is meant for games and tools that read it directly.
- QOI files are usually close to PNG in size but much faster to encode and decode.
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Frequently asked questions
Does converting EXR to QOI lose quality?
QOI is written losslessly, so the pixels are stored exactly as decoded. Floating-point values are mapped to 8 bits per channel, and anything brighter than white clips. Not carried over: any extra channels.
Is transparency kept in the QOI?
Yes. EXR stores it as an A channel stored like any other channel, and the QOI is written with an alpha channel, so transparent areas stay transparent.
Which apps open QOI files?
Game engines, GIMP 3, ImageMagick, XnView MP and many small libraries. It does not open in web browsers.
Are my images uploaded anywhere?
No. Processing happens inside your browser with WebAssembly and Web Workers. The site only downloads the app code and codecs; your files never leave your device. You can confirm this with the live upload counter on the tool, or in your browser's network panel.
Can I process many files at once?
Yes. Drop a whole selection or folder. Files are processed in parallel on several worker threads, each result can be downloaded on its own, and everything can be saved as one ZIP.
Is it free? Is there a file limit or watermark?
It is free with no account, no watermark and no daily limit. The only limit is your device's memory: very large images (over roughly 100 megapixels) may be refused to keep the tab from crashing.