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OneFileConverter
Image

Adjust brightness and contrast

Fix dull or dark photos in seconds with three simple sliders, applied to every image.

Formats
JPG, PNG, WEBP +5
Max size
100 MB
Price
Free

Drop files here

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JPG, PNG, WEBP, AVIF, HEIC, GIF, BMP, TIFF · up to 100.0 MB per file

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How to adjust brightness and contrast

  1. Add your images — up to 100 at a time.
  2. Move the brightness, contrast and saturation sliders (0 leaves a setting unchanged).
  3. Click Adjust and download.
Are my images safe?

Yes. Your images are only used to create your result — they’re never shared and never used to train AI.

What do the numbers mean?

0 leaves the photo as it is. Brightness and contrast range from −100 to +100; +20 is a gentle boost, +50 a strong one.

Are the same settings applied to every photo?

Yes — handy for a batch shot in the same light. Edit photos one at a time if each needs something different.