How to adjust brightness and contrast
- Move the Brightness and Contrast sliders. Both go from -100 to +100, and 0 means no change.
- Select Choose files and add your photos.
- Select Download for one photo, or Download all for a ZIP. Files end with -adjusted.
Brightness and contrast explained
Brightness shifts the whole picture: positive values make every pixel lighter, negative values make it darker. Contrast changes the gap between light and dark. Higher contrast makes shadows deeper and highlights brighter, which gives a punchy look, while lower contrast gives a soft, flat look. The two controls combine, so a dark and dull photo usually needs both.
Starting points
For an underexposed photo, try brightness +25 and contrast +15. For a washed-out photo with a haze, keep brightness at 0 and raise contrast to +25. For a harsh photo with glare, lower contrast by 15 and brightness by 5. Make small changes, save, and look at the result at full size. Pixels pushed past pure white or pure black lose their detail for good, so a lighter touch is often better.
How it is applied
The adjustments use the same formula as the CSS brightness and contrast filters. Each colour value is multiplied by the brightness factor, then spread around the middle gray by the contrast factor. Your browser applies this with its built-in filter when it can. When it cannot, the tool does the identical calculation on each pixel, so you get the same result in every browser.
Tips
- Remove the colour with grayscale for a black and white look.
- Place a name on the finished photo with add watermark.
- Shrink the result with the image compressor.
- Fix a sideways photo with rotate image.
Transparent areas of PNG files stay transparent. Everything runs on your device, and your photos are never uploaded.