Will brightening make my photo grainy?
Brightening reveals noise that was already in the dark areas. Moderate amounts (up to about +40) rarely show it; very dark phone photos may look grainy at high settings.
Free tool · runs in your browser
Brighten Image
Lift a dark photo without blowing out the highlights. Free, no sign-up, and your image never leaves your device.
Brightening an image makes it lighter so details hidden in dark areas become visible. The simple way — adding the same amount to every pixel — turns black into gray and pushes bright areas to flat white. This tool uses a gamma curve instead: it lifts the midtones the most, leaves pure black and pure white where they are, and so brightens a photo while keeping its contrast and highlight detail.
How to brighten an image
- 1
Add your photo
Choose a file, drop it on the box, or paste a screenshot.
- 2
Move the brightness slider
Start around +30 for an underexposed photo. Go negative to darken an image that is too bright.
- 3
Compare and download
The preview updates as you drag. The download keeps the original format and size.
Gamma vs. plain brightness
Plain brightness shifts every value by the same amount. On a dim indoor photo, +50 makes the shadows visible but also turns the black of a jacket into a muddy gray and a lamp into a white blob. A gamma adjustment bends the tone curve instead: dark and middle values move up, values near the ends barely move, and 0 and 255 stay fixed. The result looks like a better exposure rather than a gray veil.
At +100 the slider applies a gamma of about 2.8, which is enough to rescue very dark night shots. Beyond that, noise in the shadows becomes visible — no brightness tool can recover detail the camera did not capture.
When to brighten
The usual reasons a photo comes out too dark:
- Backlit shots — a person in front of a window or a bright sky.
- Indoor and evening photos taken without flash.
- Product photos on a white background that came out gray.
- Screenshots of dark interfaces that will be printed.
Brightness or contrast?
If the photo looks dark everywhere, brightness is the fix. If it looks gray and flat — no real blacks, no real whites — the issue is contrast, which this tool does not change. For documents and scans, the black and white tool in pure mode often gives a cleaner result than brightening.
Imagelier’s main tool
Need to change the text in an image?
Brightening a photo of a menu board or poster so the words are readable? If any of those words need changing, the editor can rewrite them in place. Imagelier erases the old words, rebuilds the background and sets the new text at the original size, weight and color — no Photoshop needed.
Questions
Can I darken an image too?
Yes. Negative values apply the opposite curve, deepening the midtones while keeping white white.
Does it work on transparent PNGs?
Yes. Only the colors change; transparency is kept.
Is my photo uploaded?
No. The adjustment runs in your browser on your device.
Updated October 3, 2026 · Written by the Imagelier team