Convert HEIC to HDR Online

Radiance HDR (.hdr, sometimes .pic) is the original high-dynamic-range image format developed by Greg Ward at LBL in 1985, and despite its age it remains the standard interchange container for environment maps in Blender, Cinema 4D, Houdini, Unreal Engine, and V-Ray. The format stores RGBE pixels (three 8-bit color channels plus a shared 8-bit exponent) which encode roughly 76 orders of magnitude of luminance range in a 32 bits-per-pixel structure - perfect for image-based lighting (IBL) where the brightness ratio between sun and shadow needs faithful representation.

Converting HEIC to HDR is a repackaging step, not a true HDR capture - but HEIC is a better starting point than an old 8-bit JPG. iPhone HEIC files store 10-bit HEVC-encoded data, and recent iPhones attach an HDR gain map, so decoded tonal gradients are smoother and hold slightly more usable headroom than 8-bit sources. Still, real HDR captured via bracketed exposures contains 20+ stops; the converted .hdr inherits only whatever range survived the camera's tone mapping. Wrapping it in the RGBE container makes it loadable as an environment map by 3D software that refuses HEIC or any LDR input outright.

VFX artists and Unreal Engine lighting TDs convert HEIC to HDR most often when a location scout or client shot reference panoramas on an iPhone and the deck needs to drive a quick lookdev pass - throwing that HEIC sky at a Blender world shader via this conversion is faster than re-bracketing the scene. Real production lighting still demands true 32-bit float HDR from bracketed captures, but the converted .hdr is sufficient for blocking, animation reviews, and quick technical tests. For the reverse direction see HDR to HEIC.

Radiance HDR was created in 1985 by Greg Ward at Lawrence Berkeley National Laboratory as part of the Radiance physically-based lighting simulator. The format uses an RGBE encoding where four bytes per pixel store three colour mantissas plus a shared exponent, giving an effective dynamic range of over 76 orders of magnitude in 32 bits. HDR became the de facto image-based lighting format for 3D rendering after Paul Debevec popularised light probes in the late 1990s. Every major 3D tool (Blender, Maya, Houdini, Unreal, Unity) imports .hdr environment maps natively — and modern iPhones, which record 10-bit HEIC with HDR gain maps, make surprisingly good source material for them.

Converting HEIC to HDR is a common workflow requirement wherever different software systems, platforms, and applications need to exchange image or document content. Whether you are preparing files for web publishing, print production, client delivery, or meeting upload requirements, having the right format is the starting point for every distribution workflow.

HEIC files are tied to specific software ecosystems and tools. When that content needs to move into a context that requires HDR - A different editing environment, a submission portal, a print service, or a sharing platform - A fast, reliable converter removes the format barrier without requiring software installation or technical knowledge.

heic.now processes your file securely in the cloud and returns a clean HDR output that meets the format specification of standard applications and platforms. Files are processed privately and automatically deleted after 24 hours - Nothing is stored beyond what is needed to complete your conversion.