Adjust Brightness & Contrast — Free, Instant
100% Private — files never leave your device
Drop images here
or click to browse
Supports: JPG, PNG, WebP
Fine-Tune Image Brightness and Contrast
Vizua lets you adjust brightness and contrast of any image with precise controls. Both adjustments range from -100 to +100 and are applied simultaneously using standard image processing algorithms.
Common Uses
- Fix dark photos — increase brightness to rescue underexposed shots
- Enhance contrast — make colors pop in flat or hazy images
- Prepare for printing — many printers darken images, so a slight brightness boost helps
100% Private
Your images are processed entirely in your browser. No files are uploaded to any server.
Frequently Asked Questions
How do brightness and contrast adjustments work?
Brightness adds or subtracts a fixed value from each pixel. Contrast stretches or compresses the tonal range around the midpoint (128). Both are applied per-pixel using standard image processing formulas.
Can I adjust brightness and contrast at the same time?
Yes — set both sliders to your desired values before dropping your image. Both adjustments are applied simultaneously.
What values should I use?
Start with small adjustments (+10 to +30 for brightness, +20 to +50 for contrast). Large values (beyond ±80) produce dramatic effects that may look unnatural.