Darken Image Online

Upload a photo, adjust brightness with the slider, then download — all in your browser.

Drag & drop an image here

or

No file selected

–100 darker +100 lighter
Preview
Upload an image to see the preview
Preview of brightness-adjusted image

How to darken or lighten an image

  1. Click Choose File or drag an image onto the upload area.
  2. Drag the slider left to darken, right to lighten.
  3. Click Download to save the adjusted image to your device.

About this tool

This free online brightness adjuster works entirely in your browser using the HTML5 Canvas API — your image is never uploaded to any server. It supports JPEG, PNG, WebP, and GIF files. Use it to darken a photo for use as a background, fix overexposed shots, or prepare images for overlaid text.