Brightness Adjuster

Brighten dark photos or dim overexposed ones with a live slider from 0% to 200%. Free, private, and instant — processed in your browser, never uploaded.

Upload an image

Options

100%

Live brightness slider

Drag from 0% to 200% and watch the exposure update in real time until it looks right.

100% private

Your image is adjusted entirely in your browser using the Canvas API — nothing is ever uploaded to a server.

Free and unlimited

No signup, no watermark, no daily limit. Adjust as many images as you like.

How to adjust image brightness

1

Upload your image

Drag and drop or click to select a JPG, PNG, or WebP image.

2

Move the slider

Drag the brightness slider until the exposure looks right in the live preview.

3

Pick a format

Choose PNG to keep transparency or JPG for the smallest file size.

4

Download

Click download to save the adjusted image to your device.

Frequently asked questions

How do I brighten an image?

Upload your image above and drag the brightness slider above 100% to brighten or below 100% to darken. The preview updates live, then click download to save it. Everything runs in your browser.

Is the brightness tool free?

Yes — completely free and unlimited. No signup, no account, no watermark, no daily limit.

Are my files uploaded to a server?

No. The adjustment happens entirely in your browser on your device. Your image never leaves your computer, so it stays fully private.

What does 100% brightness mean?

100% is the original, unchanged image. Values above 100% make it brighter and values below 100% make it darker.

Adjust another image

Drop in a new photo to fix its brightness — free and unlimited, no signup required.

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Choose The Right Tool

Why this page exists

Use the brightness adjuster to brighten dark photos or dim overexposed ones, with a live slider from 0% to 200%.

Best for

  • Rescuing underexposed or too-dark photos
  • Toning down overexposed, washed-out shots
  • Quick exposure fixes without heavy editing