Batch Image Brightness Adjuster

Features

• Batch upload images or import a folder
• Apply a unified brightness adjustment
• Side-by-side preview for original and result
• Download single images or export processed results as a ZIP

Usage Tips

1. Click “Choose images” or “Choose folder”, or drag files into the drop area
2. Select an image from the queue and adjust the brightness value
3. Click “Process current” or “Process all” to generate results
4. Download the current result or export processed results as a ZIP

Brightness Rule

The brightness value is multiplied by 2.55 and added to RGB channels, while alpha is preserved.

FAQ

• Q: Will it change image dimensions? A: No. It only adjusts pixel brightness and keeps the original size.
• Q: What format is downloaded? A: JPG/PNG/WebP keep the original format when possible; others fall back to JPG.
• Q: Why is batch download a ZIP? A: ZIP is more reliable for exporting many files at once and reduces browser multi-download blocking.
• Q: Are my images uploaded to a server? A: No. Everything runs locally in your browser.

Privacy

All processing happens locally in the browser and images are never uploaded.