HDR Tone Mapping

Apply the HDR tone mapping algorithm (Reinhard operator) to compress the light and dark differences of high-dynamic-range scenes, keeping highlights from blowing out and shadows full of detail. Adjustable exposure and strength, processed entirely locally in your browser.

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Drop a photo or click to upload

PNG, JPG, WEBP, BMP

What Is the HDR Tone Mapping Tool?

The HDR Tone Mapping tool uses the Reinhard operator to compress the image's luminance range, simulating the look of high-dynamic-range photography.

It makes highlights softer and shadow detail richer — ideal for backlit landscapes, night lights, and other scenes with a wide tonal range.

How to Apply HDR Tone Mapping

Follow these steps:

  • Drop or upload the photo you want to process.
  • Adjust the exposure and strength parameters.
  • Click Apply HDR Tone Mapping to review the effect.
  • Download the processed image as a PNG file.

Tips

  • Backlit and night photos show the most dramatic improvement.
  • An exposure of 120–150% enhances shadow detail.
  • Too much strength makes the image look flat — keep it around 80–100%.

Frequently Asked Questions

What is HDR tone mapping?+
Tone mapping compresses the light and dark information of a high-dynamic-range (HDR) scene into a range that ordinary displays can show. The Reinhard operator applies non-linear compression to luminance, preserving detail in both highlights and shadows.
Does it work on ordinary photos?+
Yes. Even on a regular JPG, applying tone mapping makes highlights softer and shadow detail richer, producing an HDR-like look.
How should I understand the exposure parameter?+
Exposure mimics the exposure compensation used in HDR merging: raising it brightens shadows, while lowering it makes highlights more delicate. The default of 100% is neutral.
Is my photo uploaded anywhere?+
No. All processing happens locally in your browser — your photos never leave your device.

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HDR Tone Mapping — free online HDR, tone mapping, HDR effect, high dynamic range, tone mapping online, HDR tone mapping. No signup required. Works in your browser.