This display isn't HDR — content shows at standard (SDR) brightness
1
Open MakeHDR in Safari
On your iPhone, open the converter in Safari or any browser and drop in a photo. It stays on your device.
2
Convert to Ultra HDR
Download the Ultra HDR JPG. iOS reads the embedded gain map and displays the highlights brighter.
3
View or share it
Open it in Photos, post it, or share it — it glows on your iPhone's HDR screen and falls back cleanly elsewhere.
No AI and nothing uploaded: the HDR is computed on your device, from your own pixels.
Frequently asked questions
A standard JPEG has no gain map, so iOS shows it as SDR. Convert it to Ultra HDR and iPhone displays the highlights brighter.
Yes. Ultra HDR JPGs display in HDR in the iOS Photos app and other supported apps.
No. For HDR photos, MakeHDR runs right in Safari — nothing to install and your photos stay on your device. For HDR video on iPhone or iPad, use the MakeHDR app, or convert on a computer with Chrome or Edge.
Yes — AirDrop and Messages keep the gain map, so the photo still glows on the other iPhone. Some chat apps re-compress images and may drop it.
No. Screens without HDR simply show your normal, full-quality photo — nothing looks broken or washed out.
