Adjust Brightness & Contrast — Free, Instant
Private by design — local browser processing
Drop images here
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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
Browser processing
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.