Adjust Brightness, Contrast & Saturation
Three sliders, live preview, no upload. Fix dark photos, boost colors, or dial back the intensity. Everything runs in your browser.
Drag an image here, or click to browse
JPG, PNG, WebP supported
How to adjust your image (about five seconds)
Drag a slider, see the result, download. That is the whole process.
Drop your image
Drag any JPG, PNG or WebP onto the tool.
Adjust the sliders
Brightness, contrast and saturation all update the preview in real time.
Use Reset if you go too far
One click puts everything back to normal. Each slider also has its own reset.
Download
Saves as PNG at the original resolution.
The three sliders and what they actually do
Brightness controls the overall lightness of the image. Higher values make everything lighter, lower values make it darker. Think of it like adjusting the backlight on your monitor, except it changes the actual image data.
Contrast controls the difference between the darkest and lightest areas. Higher contrast makes darks darker and lights lighter. Lower contrast flattens everything toward the middle, giving a more muted look. Photos with haze or taken through glass often benefit from a small contrast boost.
Saturation controls how colorful the image looks. At 0% you get a grayscale image. At 100% the colors are unchanged. Above 100% the colors get more intense. Most photos from phone cameras already have boosted saturation, so going higher can look unnatural fast.
When you actually need this
Fixing underexposed phone photos is the most common one. You took a photo indoors and it came out too dark. A brightness boost of 20 to 30% plus a small contrast bump usually fixes it. No fancy editing software needed.
Preparing images for print is another use case. Monitors lie about brightness. What looks fine on screen often prints darker than expected. Bumping brightness to 110 to 115% before printing can compensate. Making screenshots look less washed out is a third common case. A slight contrast increase and saturation boost can make a faded screenshot look much sharper and more presentable.
Why 100% on every slider means no change
The scale is multiplicative. 100% means “the original value times 1.0” which changes nothing. 50% halves the value. 200% doubles it. This is a standard approach used by CSS filters and most image editors. It is intuitive once you know the baseline: 100% equals no change.
Clipping: the one way adjustments lose detail
Every pixel channel runs from 0 to 255. Brightness and contrast push values up or down, and anything pushed past 255 becomes plain white, while anything pushed below 0 becomes plain black. That is called clipping, and the detail in those areas is gone for good, in the adjusted file at least.
It shows first in skies, white walls and highlights on faces. If a bright area turns into a flat patch with no texture, you have gone too far. Back off until the texture returns, then use the compare button to check against the original.
Quick fixes for common problems
Small moves go a long way. Changes of 10 to 20 percent usually fix a photo, and anything past 150 percent tends to look processed.
Same result on every device
The adjustments are calculated on the image's pixels using the formulas from the web's own filter standard, rather than relying on a browser feature that some phones do not support. The preview is drawn at a smaller size so the sliders stay smooth, and the download is calculated again at full resolution. What you see is what you get, on a laptop or an iPhone.