Video that glows in Reels.
Drop in a clip and set how bright it gets. You get an HDR MP4 that glows on iPhone, iPad and Mac in Instagram Reels and on Facebook, and plays like a normal video everywhere else.
- HDR HEVC MP4
- Up to 140 s · 30 fps
- Runs in your browser
Drop a videoor choose a videoMP4, MOV or WebM · up to 250 MB
Why HDR
In a feed of ordinary clips, yours is the bright one.
An illustration. On an HDR screen, the highlights of an HDR clip go brighter than the white of everything around it, which a standard video like this one can only suggest.
Tips
Getting the most glow
- Bright scenes glow the most: sunsets, stage lights, neon, sun on water. A dim indoor clip has little to lift.
- Post it to Instagram Reels or Facebook. Viewers on an iPhone, iPad or other HDR screen see the glow; everyone else sees a normal video.
- Skip X and TikTok for this. X plays all video in standard range, and TikTok re-compresses uploads in ways that often lose the HDR.
- Keep this tab open while it renders. The whole job runs on your device.
Controls
What the two sliders do
Brightness sets how far above normal white the brightest parts of each frame go. 3× is a good default. Past about 4× the highlights reach the ceiling a phone can show, so higher settings brighten the rest of the frame instead.
Saturation scales the colour. 1.00 keeps the original colours exactly; lower values mute them, higher values make them richer.
Output
What you get
- Container
- MP4
- Video
- HEVC (H.265)
- Colour
- PQ · BT.2020
- Size
- Long side up to 1080 px
- Frame rate
- Up to 30 fps
- Length
- First 140 s
- Audio
- Copied as is, or AAC
- Input
- Any video your browser plays, up to 250 MB
FAQ
Questions
Where does the glow show?
On HDR screens (iPhone, recent iPad, MacBook Pro, HDR monitors) in apps that play HDR video. Instagram Reels and Facebook do. TikTok accepts HDR uploads but re-compresses them, so results vary. X plays all video in standard range, so it won't glow there.
Why does the HDR version look normal on this screen?
The glow needs an HDR display with HDR turned on. Everywhere else the file plays like an ordinary video.
Is it real HDR10?
It is HEVC tagged with the HDR10 colour signals: PQ transfer and BT.2020 colour. Browsers only feed their HEVC encoders 8-bit frames, so the picture is dithered first to keep gradients from banding. Safari writes a 10-bit (Main 10) stream; Chrome and Edge write an 8-bit one.
Which browsers can render it?
Ones that can encode HEVC (H.265) with WebCodecs. Recent Chrome, Edge and Safari usually can; Firefox currently can't. If yours can't, this page tells you before you add a video.
Why is my video shorter or smaller afterwards?
Rendering stops at 140 seconds, frame rates above 30 fps are brought down to 30, and the long side is scaled to 1,080 px at most. Smaller videos are never scaled up.
Is my video uploaded anywhere?
No. It is decoded, converted and re-encoded in this tab, and never leaves your device.