Ultra HDR Tools
English
РусскийУкраїнська日本語한국어

Free Ultra HDR tools

Ultra HDR is Google's format for photos that use the extra brightness of an HDR screen while staying an ordinary picture everywhere else. These tools build and inspect those files with Google's own reference encoder, with nothing to install.

Free, no account and no watermark. Convert a file

What it looks like on an HDR screen

Sunset — Ordinary screenSunset — HDR screenOrdinary screenHDR screen
Sunset
Night city — Ordinary screenNight city — HDR screenOrdinary screenHDR screen
Night city
Indoor backlight — Ordinary screenIndoor backlight — HDR screenOrdinary screenHDR screen
Indoor backlight

Simulated. On the screen you are reading this on, both halves are identical — an ordinary display has no extra brightness to give. This is how the difference reads on an HDR display.

Tools

JPEG to Ultra HDR converterTurn a JPG into a real HDR photo online, free. Adds a gain map with Google’s libultrahdr, so highlights… PNG to Ultra HDR converterTurn a PNG into a real HDR photo online, free. Handles transparency and explains what happens to it, then… Check whether a photo is really Ultra HDRUpload a photo and see whether it still holds HDR data: gain map, MPF segment, ISO 21496-1 metadata. Use it… Turn a still image into HDR videoTurn a still photo into a short 10-bit HDR video in Rec.2020 with the PQ curve and correct mastering…

Guides

What is Ultra HDR?Ultra HDR is an ordinary JPEG with a hidden gain map that brightens highlights on HDR screens. What it is… Do HDR photos work on Instagram?Yes — Meta apps kept the HDR gain map when we checked in September 2026. Here is how to test any app yourself… Why are some Instagram posts brighter than others?Some posts glow brighter than the rest of your feed because they are HDR. Why your phone shows them that way… Why are some Facebook ads so bright?That ad glowing brighter than your feed is an HDR image your phone shows past normal white. Why it happens… Why do some videos get brighter?Some videos make your screen jump in brightness when they start. They are HDR, and your phone gives them… Why do my photos look darker on Instagram?Your photo went darker when you tapped to post: the camera roll showed the HDR version, Instagram the… How to turn off HDR on InstagramPosts and Reels too bright? Where Instagram's Disable display of HDR media setting is, what to do on Android… Case study: Ultra HDR creatives cut cost per lead from $6 to $4A health and wellness advertiser swapped live Meta ad creatives for Ultra HDR versions. Cost per lead fell…

What the converter actually builds

The visible picture — an ordinary JPEG
The visible picture — an ordinary JPEG
The gain map stored inside it
The gain map stored inside it

Both images above are real output from this converter, not an illustration. White areas of the gain map are the ones an HDR screen brightens; black areas stay exactly as they were.