Rich, detailed tone
Local contrast brings out texture in skies, foliage and surfaces, mimicking the wide dynamic range of a bracketed HDR merge from a single photo.
ImageRuns in your browser
HDR Image Effect
Fake a high-dynamic-range look with local contrast and rich tone.
- Upload
- Single file · 25 MB max
- Privacy
- Nothing is uploaded
- Cost
- Free · no sign-up · no watermark
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Processed entirely on your device
Your file is read, transformed and re-encoded inside this browser tab using JavaScript. There is no upload endpoint — nothing leaves your machine, nothing is stored, and the result is created as a local object URL that disappears when you close the page.
Overview
About the HDR Image Effect
Create an HDR effect free online — boost local contrast, compress highlights and lift saturation for a rich high-dynamic-range look from one photo, with a strength slider. No upload.
The look of a wider dynamic range
A true HDR image merges several exposures so shadows, midtones and highlights all hold detail. The result is a photo with visible texture everywhere and a rich, balanced tone that a single exposure often cannot capture.
How this tool recreates it
From one image we approximate that look in three steps: local contrast boosts the difference between each pixel and its surroundings for clarity, an exponential roll-off compresses highlights so brights keep detail, and a gentle saturation lift restores the colour that contrast can flatten.
On-device and adjustable
The tone mapping runs per pixel on an in-browser canvas with a strength slider, and the result is exported as a lossless PNG at full resolution, so your photo never leaves your device.
Step by step
How to use the HDR Image Effect
Drop a photo onto the upload area — landscapes with sky gain the most.
Raise the strength slider to increase local contrast and clarity.
Highlights roll off softly while shadow detail and colour deepen.
Download the HDR PNG at full original resolution.
Why use it
Benefits and common use cases
What this tool is good for, and what it deliberately does not try to do.
Balanced, not garish
Highlight compression keeps brights from blowing out while a modest saturation lift adds colour without the overdone crunch of heavy HDR presets.
Local and adjustable
The tone mapping runs per pixel on an in-browser canvas with a strength slider, exporting a lossless PNG.
Questions
Frequently asked questions
Short, honest answers about quality, limits and privacy.
Is this real HDR from multiple exposures?
No. True HDR merges several bracketed exposures. This is a single-image HDR look: it boosts local contrast and compresses highlights to reveal detail the way an HDR merge would.
Why does it add clarity?
HDR images look detailed because tones are spread across a wider range. Boosting local contrast — the difference between each pixel and its surroundings — reproduces that crisp, textured clarity from one photo.
Is my photo uploaded?
No. Every pixel is processed on an in-browser canvas and the result stays on your device; nothing is sent to a server.