Image Brightness Tool
Upload a dark or overexposed image, move the brightness slider, preview the correction, and download the edited image.
Your brightness-adjusted image will appear here
Fix image exposure locally
Darker or lighter output
Move from shadow recovery to subtle darkening with a single slider.
PNG or JPG download
Keep transparency with PNG or save a smaller JPG for everyday sharing.
Private local processing
您的圖像保留在您的瀏覽器中。 ImageConver 不上傳原始檔。
它是如何運作的
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1
上傳圖片
Choose a browser-readable photo, screenshot, or design.
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2
Set brightness
Use negative values to darken or positive values to brighten.
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3
下載
Review the preview and save the adjusted image.
When to adjust image brightness
Brightness changes every pixel by a consistent amount. It is useful for photos that are slightly too dark, screenshots with low visibility, and product images that need a cleaner white background.
Use small adjustments first. Very high brightness can wash out highlight detail, while strong darkening can hide shadows.
常見問題
Does brightness change image size?
No. The output keeps the same dimensions as the processed source image.
Can I download as JPG?
Yes. Choose PNG or JPG before downloading the adjusted image.
我的圖片上傳了嗎？
No. Your image stays in your browser and brightness adjustment runs locally.
Image Brightness Tool last reviewed: Jun 24, 2026.