Adjust Image Brightness Online - Brighten or Darken Photos
Adjust image brightness online for free. Upload your photo, increase or decrease brightness, and download. 100% private browser processing.
Upload an image and adjust its brightness. Slide left to darken, right to brighten.
Click to upload or drag and drop
Supports JPG, PNG, WebP, GIF
How to Use Adjust Image Brightness Online - Brighten or Darken Photos
- Click the upload area or drag and drop your image file
- Use the slider to adjust brightness (negative = darker, positive = brighter)
- Preview changes in real-time
- Click "Download Image" to save your adjusted image
Frequently Asked Questions
Is my image uploaded to a server?
No. All brightness adjustments happen in your browser. Images never leave your device.
Is this tool free?
Yes, completely free with no watermarks or limits.
What brightness level should I use?
For subtle fixes: ±10-20. For underexposed photos: +40-60. For overexposed: -40-60. Extreme: ±80-100.
Does this reduce image quality?
Minimal quality loss. Output is high-quality PNG preserving detail while adjusting brightness.
Can I fix dark photos?
Yes! Perfect for brightening underexposed photos, dark selfies, or low-light images.
What file formats are supported?
JPG, PNG, WebP, GIF as input – these are the formats browsers can decode natively, so anything your browser can display will load. The output is always PNG. Files above the size limit are rejected with a clear message instead of hanging the page.
What’s the difference between brightness and contrast?
Brightness shifts all pixels lighter/darker. Contrast adjusts difference between light and dark areas.
Can I use this for Instagram photos?
Perfect for pre-editing photos before Instagram, making dark photos brighter and more visible.
Does this work offline?
Yes, works completely offline once loaded.
Can I undo brightness changes?
Reset slider to 0 to restore original. Keep original file for non-destructive editing.