Image Brightness & Contrast

Make a quick brightness, contrast or grayscale adjustment with a before/after preview.

Make a quick brightness, contrast or grayscale adjustment with a before/after preview.

Choose a file or drop it here

Options

Brightness (%)

Contrast (%)

Grayscale

Output format

PNG, JPEG and static WebP; one file up to 20 MiB, 16 million pixels and 8192 pixels per side. PNG preserves alpha. JPEG fills alpha with white. Re-encoding removes metadata and can change color appearance. No animated input. Brightness/contrast: 0–200%. This is a pixel adjustment, not photo restoration or color calibration.

How to use

Image Brightness & Contrast

Make a quick brightness, contrast or grayscale adjustment with a before/after preview.

Step by step

Choose a supported input or load the example, then review the original.
Make a quick brightness, contrast or grayscale adjustment with a before/after preview. Start with the displayed settings, change only the options needed for your output and compare the result with your source.
Run the task, review the actual result and copy or download a checked copy.

Choosing the settings

Option	What changes
Options	Make a quick brightness, contrast or grayscale adjustment with a before/after preview. Start with the displayed settings, change only the options needed for your output and compare the result with your source.
Limits	PNG, JPEG and static WebP; one file up to 20 MiB, 16 million pixels and 8192 pixels per side. PNG preserves alpha. JPEG fills alpha with white. Re-encoding removes metadata and can change color appearance. No animated input. Brightness/contrast: 0–200%. This is a pixel adjustment, not photo restoration or color calibration.

Example and expected result

A 640 × 400 PNG at brightness 110% still exports at 640 × 400. Brighter pixels can clip; compare the preview.

If it is not working

Brightness must be between 0 and 200%. Your selected image is kept.

Formats and limits

PNG, JPEG and static WebP; one file up to 20 MiB, 16 million pixels and 8192 pixels per side. PNG preserves alpha. JPEG fills alpha with white. Re-encoding removes metadata and can change color appearance. No animated input. Brightness/contrast: 0–200%. This is a pixel adjustment, not photo restoration or color calibration.

FAQ

What does this tool do?

Make a quick brightness, contrast or grayscale adjustment with a before/after preview.

Which setting should I choose?

Make a quick brightness, contrast or grayscale adjustment with a before/after preview. Start with the displayed settings, change only the options needed for your output and compare the result with your source.

What are the limits?

PNG, JPEG and static WebP; one file up to 20 MiB, 16 million pixels and 8192 pixels per side. PNG preserves alpha. JPEG fills alpha with white. Re-encoding removes metadata and can change color appearance. No animated input. Brightness/contrast: 0–200%. This is a pixel adjustment, not photo restoration or color calibration.

Why did processing fail?

Brightness must be between 0 and 200%. Your selected image is kept.

Is my input uploaded or saved?

No. Processing runs on your device. Inputs and results stay in this page’s memory until you clear it or leave. They are not uploaded, logged or stored by ToolRobin. Copying places the result on your device’s clipboard.