Upload your logo and get an HDR JPEG back: on HDR screens the colors you pick glow up to 7.5x brighter than #FFFFFF, and on every other screen it's a perfectly normal image. Works on LinkedIn, Instagram and the web. Free, no signup, and the file never leaves your browser.
HDR displays hold most of their brightness in reserve. Standard white, the #FFFFFF your logo normally maxes out at, renders around 200 nits, while the same panel can reach 1,000 nits or more for HDR content. The difference is called headroom, and photos from any recent iPhone or Android flagship already use it: that's why camera-roll photos sometimes look more vivid than everything around them.
This tool gives your logo access to the same headroom. It embeds a gain map, a second grayscale image inside the JPEG that marks which pixels get boosted and by how much, with metadata in both the ISO 21496-1 standard format and the older Adobe format for maximum compatibility. Software that understands gain maps (Chrome, Safari 26, Apple Photos, LinkedIn, Instagram) pushes the marked pixels into the headroom. Software that doesn't simply shows the untouched base image. The default boost of +2.9 stops lands around 1,500 nits, roughly the ceiling of what current screens actually display.
Everything happens in your browser: the clustering that finds your logo's colors, the mask, the JPEG encoding and the container assembly. Your file is never uploaded, stored or seen by us. If you're building ad creative rather than a profile picture, Adside's brand kits keep your real colors, fonts and logos consistent across every ad, and the rest of the free tools cover hooks, budgets and benchmarks.
The same trick works for live text on a website. Browsers don't support HDR colors in CSS yet, but they do render HDR images, so you can paint a headline with your generated file using background-clip. Wrap it in a dynamic-range media query so SDR visitors keep a normal color:
/* Paint text with an HDR gain-map image. SDR visitors get the fallback color. */
h1.glow { color: #fff; }
@media (dynamic-range: high) {
h1.glow {
background: url('/your-logo-hdr.jpg') 50% 50% / cover;
-webkit-background-clip: text;
background-clip: text;
color: transparent;
}
}Generate a solid-white image with this tool (the sample wordmark works) and reference it as the background. Use it on a headline or an accent, not body text: the point of a glow is that one thing has it.
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