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- Private: files never leave your device
- Free, no sign-up
- Fast, works offline once loaded
How to use Image Brightener
- Drop your dark or underexposed photo into the box.
- Raise Brightness boost and Lift shadows until the details appear. Add a little contrast and saturation.
- Download the picture, or all of them as a ZIP.
About this tool
Fix photos that came out too dark. The brightener uses a tone curve instead of a simple overlay, so shadows open up while highlights stay under control and colors do not wash out. A separate shadow slider reveals dark detail in backlit pictures.
Use the compare button to hold and see the original. All processing is local.
Frequently asked questions
How do I brighten a dark photo?
Increase Brightness boost, then Lift shadows to reveal detail.
Why does my photo look washed out after brightening?
Add a little Contrast and Saturation to restore punch.
Can I brighten many photos?
Yes. Add several and download them together.
Is Image Brightener really free?
Yes. You can use Image Brightener as often as you like with no sign-up, no watermark and no daily limit.
Are my images uploaded to a server?
No. Image Brightener runs entirely in your web browser, so your files stay on your own device and are never sent to DEWANARO or anyone else.