BRIGHTNESS
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OneImageTool
Free Image Tools
BRIGHTNESS
Fix underexposed or washed-out photos with a single brightness slider. Preview updates instantly.
or click to browse — JPG, PNG, WebP
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fix exposure
The slider is a multiplier, not an offset: at 130% every channel is scaled by 1.3, at 70% by 0.7. That single fact explains most of what it can and cannot do. Zero times anything is still zero, so a crushed black shadow stays black no matter how far right you push it, while the bright end runs into the 255 ceiling and clips.
The practical consequence is to brighten toward the highlights, not away from the shadows. If the subject is dark but the sky is already near white, raising brightness will blow the sky out before the subject is usable — pull the highlights down first, then lift here.
three steps
A JPG, PNG or WebP. Nothing is uploaded, so a full-resolution camera file opens as quickly as a phone screenshot.
The range runs 0% to 200%, with 100% untouched. Watch the brightest object in the frame rather than the overall impression — that is what clips first, and detail lost to clipping does not come back.
Export as PNG for a lossless copy, or JPG and WebP with a quality slider when it is going on a page.
quick answers
Start at 100%. 110 to 130% covers most underexposed indoor and backlit shots; 70 to 90% pulls back a photo that came out too hot. Past 150% the highlights are usually gone.
Because the adjustment multiplies. A pixel at zero stays at zero however large the factor is. Nothing on this page can invent detail that the sensor never recorded — if the shadows are pure black in the file, they are gone.
All three channels are scaled by the same factor, so hue is preserved in the midtones. Very high settings still shift perceived colour, because the channels clip at 255 one at a time and the brightest one hits the ceiling first.
Brightness moves every pixel. Highlights moves only the bright half of the range. Use highlights when the sky is blown but the faces are fine, and brightness when the whole frame is under-exposed.
After. Cropping changes which parts of the image you are judging, and an exposure that looked right on the full frame often looks wrong once the bright background is out of shot.
No. Processing is local in your browser and works offline.
Yes — free with no watermark.