Question 1

What do brightness and contrast controls do?

Accepted Answer

Brightness shifts all pixel values up or down uniformly. 100% is the original. Values above 100% lighten the image; values below 100% darken it. Contrast controls the difference between dark and light areas. 100% is the original. Higher contrast makes bright areas brighter and dark areas darker; lower contrast makes the image look flat.

Question 2

What slider values should I use?

Accepted Answer

For a quick fix on underexposed photos, try brightness around 120-140% with contrast at 110-120%. For washed-out images, keep brightness at 100% and raise contrast to 120-150%. For a faded film look, lower contrast to 70-80%. The live preview shows the effect before you commit.

Question 3

Does adjusting brightness or contrast reduce image quality?

Accepted Answer

For PNG, there is no additional compression loss beyond the adjustment itself. For JPG and WEBP, the output is re-encoded at 92% quality. There is always some generation loss with lossy formats, so avoid repeatedly re-processing the same JPG.

Question 4

What image formats are supported?

Accepted Answer

PNG, JPG, JPEG, and WEBP images up to 50 MB. The output format matches the input format.

Question 5

Is my image sent to a server?

Accepted Answer

No. All processing runs in your browser using the Canvas API. Your image never leaves your device. No uploads, no accounts, no storage.

Brightness & Contrast

When to use this

Fix dark photos

Boost contrast

Prepare for print

Free brightness and contrast adjuster for images

Quick answers

Related tools