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Image Brightness & Contrast

Fine-tune brightness and contrast with real-time preview

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画像明るさ・コントラスト調整

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About Image Brightness & Contrast

Adjusting brightness and contrast is one of the most common image editing tasks. Whether a photo taken indoors turned out too dark, scanned text looks washed out, or social media images need a bit more pop, these small corrections come up frequently. Launching heavy image editing software just for a quick tweak feels wasteful.

This tool lets you drop an image into the browser and use intuitive sliders or direct number input to adjust brightness (-100 to +100) and contrast (-100 to +100) with real-time Canvas pixel preview. For common scenarios — dark rooms, scanned documents, backlit photos, or faded images — four quick-access preset buttons instantly apply recommended adjustment values, saving you time and experimentation.

All processing happens client-side with no server upload, so you can safely work with confidential or sensitive images. Once satisfied with the result, download the adjusted image in PNG, JPEG, or WebP format with a single click. Perfect for business workflows: preparing photos for sales decks and internal newsletters, correcting blog post images, fine-tuning product photos for e-commerce, improving screenshots in presentations, and more.

How to use Image Brightness & Contrast

  1. Drag and drop an image file, or click to browse and select one.
  2. Adjust brightness and contrast by moving the sliders or entering values directly. Watch the real-time preview update instantly.
  3. Optionally, use one of four preset buttons (Dark room, Scanned, Backlit, Faded) to apply recommended adjustments with a single click.
  4. Click the download button to save the adjusted image in PNG, JPEG, or WebP format.

Benefits of Image Brightness & Contrast

  • No installation needed and no server upload — safely adjust even confidential images in your browser.
  • Adjust using sliders or direct numeric input. Number inputs are useful for making precise, repeatable adjustments.
  • Four quick presets for common scenarios. Even beginners get professional-looking results with a single click.
  • Real-time preview lets you see changes instantly, reducing trial-and-error experimentation.
  • Support for PNG, JPEG, and WebP formats. The tool automatically detects your input format and saves accordingly.

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