OpenEXR Image (.EXR)
OpenEXR is a high dynamic range raster image format developed by Industrial Light & Magic for use in visual effects and motion picture production. It supports 16-bit and 32-bit floating-point pixels, multiple compression methods, arbitrary image channels, and multi-part files. OpenEXR is the industry standard for storing intermediate and final rendered frames in VFX pipelines.
Advantages of OpenEXR Image
What the EXR format does well, and why you might choose it.
- Industry-standard 16-bit and 32-bit floating-point precision for VFX work
- Supports an arbitrary number of named channels and deep image data
- Multiple lossless and lossy compression options including PIZ and DWAA
Limitations of OpenEXR Image
What the EXRformat doesn't do well, and when to choose another format.
- Large file sizes even with compression, especially for 32-bit data
- Not supported by web browsers or most consumer image viewers
- Complex format specification requires specialized libraries to read and write
What EXR files are used for
- Visual effects compositing and intermediate renders in film production
- 3D rendering output for lighting and shading passes
- HDR image storage for professional color grading and post-production
How EXR files work
Raster images are grids of pixels, each carrying color information. The format determines how those pixels are stored: lossless formats (PNG, TIFF, BMP, WEBP-lossless) preserve every pixel exactly, lossy formats (JPG, WEBP, AVIF, HEIC) discard imperceptible detail to shrink the file. Color depth (8-bit, 10-bit, 16-bit), color profile (sRGB, Display P3, ProPhoto), alpha channel support, and metadata (EXIF, IPTC, XMP) all vary by format. Modern web formats like AVIF and WEBP build on improvements in video compression to deliver dramatically smaller files at equivalent quality versus JPG and PNG.
Best practices when working with EXR
Photographs compress well as JPG or AVIF; graphics with sharp edges, text, or transparency belong in PNG or WEBP-lossless. Never re-save a JPG repeatedly — every save adds compression artifacts. Strip EXIF metadata before publishing photos publicly if you don't want GPS coordinates and camera serial numbers exposed. For print, deliver in TIFF at 300 DPI; for screen, JPG/WEBP at 72-100 DPI is plenty. If you're optimizing for the web, AVIF beats WEBP beats JPG on file size, but JPG still has the broadest support.
Convert to EXR
The most common formats people convert to EXR, ready to convert in seconds.
Convert EXR to other formats
Convert OpenEXR Image files into the format you actually need.
Choosing EXR versus the alternatives
JPG: photographs, social media uploads, anywhere universal compatibility matters. PNG: graphics with text, line art, screenshots, or transparency. WEBP: modern web replacement for JPG and PNG with better compression. AVIF: best-in-class web compression, growing browser support. TIFF: print and archival masters. BMP: rarely the right answer in 2026 — uncompressed and uniform-poor versus PNG. HEIC: efficient mobile photo capture, but limited compatibility outside Apple's ecosystem.
Where EXR fits in real workflows
Most image workflows have a master file (PSD, RAW, TIFF) that you keep forever and never publish, plus delivery exports (JPG, WEBP, AVIF) generated for each context where the image appears. Treat published files as derivatives — if quality requirements change, regenerate from the master rather than re-converting an already-compressed version.
Privacy and file handling
When you convert a EXRfile with MegaConvert, the file is uploaded to our converter, processed, and automatically deleted within an hour. We don't train models on your files, share them with third parties, or retain them after the conversion completes. The download link expires when the file is removed. If your work involves files subject to NDA or compliance requirements (HIPAA, GDPR data processing), please review our privacy policy before uploading sensitive material.
Frequently asked questions about EXR
What is a .EXR file?
OpenEXR is a high dynamic range raster image format developed by Industrial Light & Magic for use in visual effects and motion picture production. It supports 16-bit and 32-bit floating-point pixels, multiple compression methods, arbitrary image channels, and multi-part files. OpenEXR is the industry standard for storing intermediate and final rendered frames in VFX pipelines.
What is the MIME type of EXR?
The official MIME type for EXR files is image/x-exr. This is the value web servers and applications use to identify the format when transferring files.
What category does EXR belong to?
EXR is a Image Converter format. Files in this category share common conversion paths and use cases.
How do I open a .EXR file?
EXR files are typically opened by software that natively supports the OpenEXR Imageformat. If you don't have a compatible application, the most reliable approach is to convert the file to a more universal format using the converters listed above. Most OpenEXR Image files convert to widely-supported alternatives in seconds.
Have a EXR file you need to convert?
Free, instant, no signup. Files deleted within an hour of upload.
Convert EXR to JPG