Image Brightness & Contrast Adjuster - Free Online Tool
Image Brightness & Contrast Adjuster
Fine-Tune Any Image in Your Browser
Drag & drop an image, or click here
Understanding Brightness & Contrast
Live Preview
See adjustments applied instantly as you move the sliders — no separate 'apply' step needed.
Independent Controls
Brightness and contrast are applied together but adjusted independently, so you can dial in the exact look you want.
Rescue Underexposed Photos
Brighten a dark photo or boost contrast in a flat, washed-out image without any photo-editing software.
Local Processing
Adjustments happen entirely in your browser using the Canvas API — your image is never uploaded.
Brightness vs. Contrast
Brightness shifts every pixel's value up or down uniformly, making the whole image lighter or darker. Contrast instead stretches or compresses the range between the darkest and lightest pixels, making shadows deeper and highlights brighter (or flattening them). The two are often adjusted together to correct a photo's overall exposure.
Key Takeaways
- Live Sliders: Both brightness and contrast update the preview instantly as you drag.
- 0–200% Range: 100% is unchanged; below darkens/flattens, above brightens/intensifies.
- Client-Side Only: All adjustment happens locally in your browser — no data is ever sent to a server.