Brightness & Contrast Editor
Adjust the brightness, contrast and saturation of an image with live sliders, then download it.
Drag & drop an image here, or click to browse
No uploads. Your files stay on your device.
How it works
Drop a photo, then drag the brightness, contrast and saturation sliders — the preview updates instantly. Every pixel is recalculated with the Canvas API on your own device, so the picture is never uploaded to a server and there is no queue, watermark or sign-up. Download the corrected image at its full original resolution when you like the result.
The sliders use the same maths as the CSS filter property: 100% means
"unchanged", below 100% dims or flattens, above 100% boosts. Brightness multiplies every
channel, contrast pushes values away from mid-grey, and saturation at 0% gives a clean
black-and-white conversion. The Copy CSS filter button hands you the exact
equivalent one-liner so web developers can apply the same look in a stylesheet.
Frequently asked questions
How do I brighten a dark photo online for free?
Drop the photo into the editor and drag the brightness slider above 100%. The preview updates instantly beside the original, so you can see exactly how much lighter it gets. If the picture also looks washed out, nudge contrast up a little, then click Download image to save it at the original resolution — free, with no watermark or sign-up.
Is my image uploaded to a server?
No. The photo is decoded and every pixel recalculated with the Canvas API inside your own browser, so nothing is sent anywhere. The tool keeps working with your network disconnected, which also means large photos are processed at full speed with no upload wait and no storage of your files.
What is the difference between brightness and contrast?
Brightness multiplies every pixel value, so the whole image gets uniformly lighter or darker. Contrast pushes values away from mid-grey — highlights get brighter and shadows get darker at the same time, which makes a flat photo look punchier. Saturation controls colour intensity, and setting it to 0% gives a black-and-white conversion.