Free online converter for converting files to EXR.
We ensure quality, convenience, and support for all formats.
| Data type | Image |
| MIME type | image/x-exr |
| Developer | Industrial Light & Magic (ILM); maintained by Academy Software Foundation (ASWF) |
| Primary use cases | CG/VFX rendering outputs, compositing, AOV/pass storage, HDR scene-linear interchange, texture pipelines (mipmaps/ripmaps), deep compositing, archival/intermediate masters in production |
OpenEXR (EXR) is a high-dynamic-range, multi-channel raster image format widely used in VFX and animation pipelines.
| Data type | Image |
| MIME type | image/x-exr |
| Compression | Optional; multiple lossless and lossy methods are available |
| Color depth | Commonly 16-bit float per channel (half) or 32-bit float; can also store 32-bit unsigned integer channels |
| Color space | Typically scene-linear RGB; color characteristics may be described via chromaticities/white point and related header attributes |
| Transparency support | Yes |
| Animation support | No |
| Resolution support | Any; tiled files can store multi-resolution images (mipmaps/ripmaps) in a single file |
| Metadata | Metadata is stored as typed header attributes (required and optional). OpenEXR supports arbitrary extra attributes; common ones include dataWindow/displayWindow, pixelAspectRatio, lineOrder, compression, and many pipeline/camera/color fields |
| Standard / Specification | OpenEXR file format specification (ASWF OpenEXR project) |
| Typical file size | Highly variable. Uncompressed 4K RGBA half-float is ~63 MiB per frame; lossless compression often reduces photographic/grainy images to roughly 35–55% of uncompressed size; multi-layer/deep data increases size |
| Year introduced | 2003 |
The EXR file format offers several advantages that make it suitable for common use cases.
The EXR file format has certain limitations that may affect its use in specific scenarios.
EXR images are widely supported and can be viewed on most devices and platforms.
Treat EXR as untrusted input: complex headers/attributes, optional deep data, and compression require strict bounds checks. Keep decoders and image tools updated
BSD-3-Clause (reference implementation); open format specification