Adjust Image Brightness
Lighten or darken decoded image colors with a brightness adjustment from −100 to 100.
Your selected images stay in this browser. No AI model call or server upload.
Selected files: 0 · PNG, JPEG and WebP. Up to 8 MB per file and 12 million decoded pixels. Batch totals cannot exceed 40 MB. Exports are still images; animation is not retained.
Exported images do not carry the original saved prompts, EXIF or Content Credentials. Keep the original file when you need its creation records.
The adjustment adds the selected percentage of the channel range and clips values at black or white. Transparency remains unchanged. Clipped highlights and shadows cannot be recovered afterward.
How to use this tool
- Choose a photo or graphic and inspect the current light and dark areas.
- Enter an Amount between −100 and 100. Positive values lighten the image; negative values darken it.
- Run the adjustment and check whether highlight or shadow detail has disappeared. Use a smaller change if needed, then download the PNG.
Frequently asked questions
How do I brighten an image without losing highlights?
Start with a small positive Amount and inspect bright areas after each run. This tool adds a fixed value to the channels and clips at 255, so large changes can remove highlight detail. It does not selectively recover shadows.
Does brightness change image transparency?
No. Only red, green and blue values change. The alpha channel remains unchanged, and the output is a PNG.
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