Are NanoTools completely free to use?

Yes, all basic tools on NanoTools are completely free to use with no registration required. We offer premium features for power users.

Is my data secure when using NanoTools?

Your files are processed securely and are automatically deleted after processing. We do not store your files or data on our servers.

No installation required. All tools work directly in your browser on any device - computer, tablet, or smartphone.

We support a wide range of formats including PDF, JPG, PNG, WebP, GIF, JSON, XML, CSV, and many more depending on the tool.

Adjust image contrast online for free. Enhance photo contrast for better visibility. Control light and dark values.

Drop an image here or click to browse

image/* • Max 50MB

1

Select image to adjust

2

Move slider to change contrast

3

See real-time changes

4

Save adjusted image

Contrast increases difference between light and dark areas, making images more dramatic.

Yes, adjust brightness first, then contrast for best results.

Very high contrast may lose detail in highlights and shadows.

Ideal setting depends on image. Start with small adjustments and preview results.