Skip to content
MixTool

Adjust image brightness

Rescue dark, underexposed photos — or calm down bright ones — with a live before/after comparison.

  • Files never leave your device
  • Free · no sign-up
  • Works on phone and desktop
Loading tool…

Fix photos that are too dark or too bright

Indoor shots, evening photos and pictures taken against a window often come out too dark. Increasing brightness lifts the whole image so faces and details become visible again; reducing it helps with slightly overexposed shots.

Drag the slider and compare with the original using the split view. Pair brightness with a touch of contrast (under More adjustments) so the image doesn't look washed out. The final photo is processed at full resolution.

How to brighten a photo

  1. 1

    Open the photo

    Choose, drag in or paste your image.

  2. 2

    Move the slider

    Positive values brighten, negative values darken.

  3. 3

    Balance with contrast

    Add a little contrast if the picture looks flat.

  4. 4

    Download

    Save in the original format and size.

Key features

  • −100 to +100 range

    From subtle lifts to dramatic corrections.

  • Split before/after view

    See exactly what changed.

  • Other adjustments included

    Contrast, grayscale, blur and sharpen in the same place.

  • Private

    The photo never leaves your device.

Common uses

  • Dark indoor photos: Make party and restaurant pictures visible.
  • Documents photographed in poor light: Improve readability before sharing or printing.
  • Product images: Get a brighter, cleaner look for listings.

Tips and good to know

  • Pure white areas can't get any brighter; pushing too far makes highlights lose detail. Increase gradually.
  • For photographed documents, combine +20 to +40 brightness with extra contrast, then make a PDF.

Frequently asked questions

How do I brighten a dark photo?

Open it and move the Brightness slider to the right until faces and details are clear. Add a small amount of contrast if it looks grey.

Can I darken an image too?

Yes. Move the slider to the left to reduce brightness.

Does it change the resolution?

No. The download has the same dimensions and format as your original.