Image format
What is a EXR file?
EXR (OpenEXR) is a high-dynamic-range image format built for visual effects work, storing far more brightness detail per pixel than a standard photo format.
Industrial Light & Magic built OpenEXR in 1999 for its own film pipeline and open-sourced it in 2003, and it's since become the de facto standard for handing rendered or scanned frames between VFX and animation studios. Where a JPG or PNG clamps every pixel to a fixed brightness range, EXR stores color as 16- or 32-bit floating-point values, so a blown-out sky or a shadowed doorway both keep real data an artist can pull back in compositing rather than pixels that were already thrown away at capture time. That flexibility comes at the cost of file size and near-universal absence from consumer software — it's a working format for VFX and 3D tools, not something a photo viewer or browser will open.
How to open a EXR file
EXR isn't something ordinary photo viewers or browsers open — it needs Nuke, Blender, DaVinci Resolve, Photoshop (with a plugin).
EXR is a professional VFX/3D working format — it won't open in Windows Photos, macOS Preview, or a browser without a plugin.
Strengths & limitations
Good for
- stores far more dynamic range than 8-bit formats
- floating-point precision survives repeated edits without banding
- industry standard for VFX and 3D rendering
Watch out for
- not viewable in ordinary photo apps or browsers
- large files compared to compressed formats
Convert EXR files
Orbfile can convert EXR both ways, entirely in your browser — pick a direction below:
Frequently asked questions
What does a EXR file contain?+
EXR (OpenEXR) is a high-dynamic-range image format built for visual effects work, storing far more brightness detail per pixel than a standard photo format.
Can I convert EXR for free?+
Yes — Orbfile's image converter handles EXR for free, with no file limit, watermark, or account, and it runs entirely in your browser.
Is converting a EXR file safe and private?+
Yes. Orbfile processes EXR files locally on your device using WebAssembly — nothing is uploaded to a server, so there's nothing to leak or store.
Who created the EXR format?+
EXR was developed by Industrial Light & Magic, first released around 1999 (open-sourced 2003).
Browse the full file format guide.