How to adjust brightness and contrast in a photo

Brightness is how light or dark the photo is overall; contrast is the gap between its darkest and lightest tones. A single brightness slider shifts everything at once, which often blows out highlights or blocks up shadows. Real editors give you two better tools instead: Levels and Curves.

Both let you move the midtones independently of the black and white points, so you can lift a dull photo or deepen a flat one without losing detail at the extremes. The EditItAll photo editor includes Levels, Curves, hue/saturation and color balance for exactly this kind of tonal work.

Here is the quickest path in the photo editor:

• Open the editor and load your image (PNG, JPG or WebP).
• To change brightness, open Levels and drag the middle (gamma) slider left to brighten or right to darken.
• To change contrast, open Curves and make a gentle S-shape — lift the upper part and lower the bottom — so lights get lighter and darks get darker.
• Watch the highlights and shadows so detail does not clip at either end.
• Export as PNG or JPG when it looks right.

It all runs on your device — go offline after the page loads and it still works, so your photo is never uploaded.

Levels is the faster tool for a straightforward fix: set the black point, the white point and the midtone, and you are done. It is ideal when a photo is simply too dark, too light, or a little flat.

Curves is the same idea with more control — instead of three sliders you shape a line, so you can brighten midtones while protecting highlights, or add contrast only in a specific tonal range. If Levels feels too blunt for what you are trying to do, switch to Curves.

The usual mistake is pushing an adjustment so far that highlights turn to flat white or shadows to solid black — once a tone clips, that detail is gone. Make smaller moves, and check the brightest and darkest areas as you go. If only part of the frame needs adjusting, use a selection or work on a separate layer; see using layers in a photo editor. And if a photo also looks soft, tonal contrast is not the same as focus — sharpening a blurry photo is a different step.