Lossless High Compression
Our advanced algorithm compresses EXR by 60%–85% with virtually no visible quality loss, saving storage and bandwidth costs.
Compress OpenEXR (.exr) HDR images online for free. PIZ lossless or B44A (smaller), keeping the HDR float data and .exr format. Built for VFX and 3D. Files auto-deleted in 1 hour, no sign-up.
No technical knowledge needed. Free, fast, and available on any device.
We go the extra mile on every detail to deliver the best compression experience.
We re-encode the EXR with a more efficient internal compression scheme. At high quality we use PIZ, a lossless wavelet codec that works well on natural and rendered imagery and is widely supported. At lower quality we use B44A, a lossy scheme that gives a fixed ~50% reduction with maximum compatibility (it opens reliably across OpenEXR tools and viewers). Both keep the HDR float channels and the .exr format intact. Powered by OpenImageIO (oiiotool).
OpenEXR (.exr) is the high-dynamic-range, floating-point image format created by Industrial Light & Magic and used throughout VFX, 3D rendering and compositing. Because each channel stores full float data, renders and multi-layer EXRs become very large. Compressing an EXR reduces its size while preserving the HDR float values your pipeline depends on.
As web content becomes richer, image file sizes have an increasingly significant impact on page performance. Oversized, unoptimized images slow down page loading, directly affecting search engine rankings (SEO) and user retention.
Using PicEditLabs online EXR compressor is a 3-step process: (1) Upload your EXR file (drag & drop supported); (2) Wait for the system to complete lossless compression automatically; (3) Click download. No software to install, no account to create, completely free, works on any device.