OneImageTool

Free Image Tools

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BRIGHTNESS

Adjust Brightness

Fix underexposed or washed-out photos with a single brightness slider. Preview updates instantly.

BRIGHTNESS

☞ runs entirely in your browser — nothing is uploaded

Drop your image here

or click to browse — JPG, PNG, WebP

fix exposure

Brighten or darken a photo online

Indoor shots, backlit subjects and phone photos often need a quick exposure bump. This page focuses on brightness only for a fast workflow.

Need saturation or color tone too? Use the full Adjust Image tool for every control in one place.

three steps

How to adjust brightness online

01

Upload

Choose a JPG, PNG or WebP image.

02

Set brightness

Move the slider — 100% is unchanged, below darkens, above brightens.

03

Download

Save the adjusted image in your preferred format.

quick answers

Brightness FAQ

What brightness value should I use?

Start at 100% (no change). Try 110–130% for dark photos or 70–90% to recover slightly blown highlights.

Does this change colors?

Brightness scales all RGB channels equally on this page — saturation and tone are unchanged.

Are my files uploaded?

No. Processing is local in your browser.

Is this tool free?

Yes — free with no watermark.

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