Is this a real gain map or just a brightness filter?

Real gain maps. MakeHDR computes per-pixel, per-channel maps in 32-bit float and encodes standards-compliant Ultra HDR (ISO 21496-1 + Adobe XMP) using Google's libultrahdr — the same encoder family the professional plugins rely on. No AI, no upscaling.

Does it change my edit?

No. Your SDR base image is preserved exactly; HDR only adds headroom to the highlights you already crafted.

Where do the files display in HDR?

iPhone, Chrome, Safari, Instagram and Google Photos render the HDR. Everywhere else they fall back cleanly to your SDR edit.

Ship HDR without the pipeline

Deliver true HDR your clients can actually see glow on their phones — without a 32-bit Photoshop pipeline or paid plugins. MakeHDR turns your finished JPEGs into standards-compliant Ultra HDR (ISO 21496-1 + Adobe XMP, encoded with Google's libultrahdr — the same gain-map standard Apple and Google use).

See the difference

Real gain maps, not filters

Per-pixel, per-channel gain maps computed in 32-bit float — no AI, no upscaling, the same encoder family the pro plugins use.

Your edit stays your edit

The SDR base image is preserved exactly. HDR adds headroom to the highlights you already crafted.

Client-ready deliverables

Files work across iPhone, web and social — and fall back gracefully everywhere else.

Frequently asked questions

Try it on your best shot