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DataToolings

Brightness & Contrast Adjuster — Free Online Tool

Adjust image brightness and contrast online. Real-time preview with sliders. Supports JPG, PNG, and WebP. No upload required — 100% browser-based.

Drop an image here or click to upload

Supports JPG, PNG, WebP

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What is the Brightness & Contrast Adjuster?

The Brightness & Contrast Adjuster is a free online tool that lets you tweak the exposure and contrast of any image directly in your browser. Use the sliders to brighten dark photos, add punch to flat images, or fine-tune any image before sharing or publishing — no software installation needed.

How to Adjust Brightness and Contrast

  1. Upload your image by dropping it on the upload area or clicking to select
  2. Use the Brightness slider to make the image lighter or darker
  3. Use the Contrast slider to increase or reduce color differentiation
  4. Click 'Download' to save the adjusted image

Features

  • Real-time brightness adjustment (-100 to +100)
  • Real-time contrast adjustment (-100 to +100)
  • Side-by-side before/after preview
  • Reset sliders to default with one click
  • 100% client-side — files never leave your device

FAQ

Are my images uploaded to a server?

No. All processing is done locally in your browser using the Canvas API. Your images never leave your device.

What does brightness do?

Brightness shifts all pixel values uniformly brighter or darker. Increasing it lightens the entire image; decreasing it darkens it.

What does contrast do?

Contrast increases the difference between light and dark areas. High contrast makes colors more vivid and distinct; low contrast makes the image appear flat or washed out.