How to use Brightness & Contrast
- Drop your photos
- Drag the brightness, contrast and saturation sliders while watching the preview
- Click Apply and download
About this tool
Brightness shifts every pixel lighter or darker. Contrast stretches the difference between light and dark tones. Saturation makes colors more vivid or more muted. Small changes (±10–20) usually look most natural. The same settings are applied to every image in a batch.
Frequently asked questions
Will adjusting brightness lose detail?
Very large changes can clip highlights to pure white or shadows to pure black. Keep adjustments moderate.
Can I undo changes?
Your original file is never changed. Reset the sliders to zero and try again.
Does it work on HEIC photos?
Yes. HEIC files are decoded in your browser first.
Are my files uploaded to a server?
No. ConvertBrightly processes files with JavaScript inside your browser. Nothing is sent over the network, and the files disappear when you close the tab. You can even disconnect from the internet after the page loads.
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