How does the contrast adjustment work?

It scales each colour channel around the mid-grey value of 128 using the standard contrast factor, so positive values push lights and darks apart and negative values bring them together.

What range do the sliders cover?

Both brightness and contrast range from -100 to +100, where 0 leaves the image unchanged. Brightness adds or subtracts light; contrast widens or narrows the tonal spread.

Is my photo uploaded?

No. All adjustments are computed in your browser via the canvas API, so the image never leaves your device.

Brightness & Contrast Adjuster

Fine-tune any photo's brightness and contrast with live sliders.

Brightness & contrast adjuster

Brighten or darken any photo and fine-tune its contrast with two live sliders. Brightness shifts every pixel lighter or darker, while contrast pushes the lights and darks apart for more punch — or pulls them together for a flatter look.

The preview updates instantly and everything runs in your browser, so your image is never uploaded.