Select language

Interface controls and tool names are translated. Detailed instructions, legal text and some form labels remain in English. Your files are not translated.
Easy To Use - 140+ Free Online Tools

Adjust Image Brightness

Make an image brighter or darker.

Drop your files here

or

Choose files

Max 100 MB per file · JPG, JPEG, JFIF, PNG, WEBP, GIF, BMP, TIF

    Image options

    PNG output. Animation uses the first frame. Large images may be resized. Multiple images follow the upload queue order.

    Your file is ready!

    Download
    Free No watermark No sign-up Files never uploaded
    White areas lost detail?Very bright settings turn them pure white — use small steps.
    Looks washed out?Combine with Adjust Image Contrast.
    Screens look different?Check on more than one device.

    Related Tools

    Adjust Image ContrastIncrease or decrease image contrast.Compress ImageShrink JPG, PNG and WEBP images while keeping them sharp.Resize ImageChange the width and height of JPG, PNG and WEBP images.Crop ImageCut the edges of an image or crop it to a square, 4:3 or 16:9.Rotate ImageRotate an image by 90°, 180° or 270°.Watermark ImageAdd your own text watermark to an image.Remove Image MetadataRe-encode an image as PNG without copying original EXIF, GPS or source metadata.Add Image BorderAdd a coloured border around an image.Flip Image HorizontallyMirror an image from left to right.Flip Image VerticallyFlip an image from top to bottom.

    How to use Adjust Image Brightness

    1. Select your images.Add dark indoor or night photos, or pictures that are too bright.
    2. Set the brightness.Move the slider to make the image lighter or darker.
    3. Click Adjust Image Brightness.Save the lighter or darker version.
    4. Check the image.Increase in small steps so white areas keep detail.

    About Adjust Image Brightness

    When is it useful? Adjust Image Brightness lightens dark photos taken indoors or at night, or darkens pictures that are too bright, so they are easier to see on screen and in print.

    Good to know: 100% leaves the picture unchanged; lower values make it darker and higher values make it brighter, up to 300%. The default 120% gives a gentle lift. Very bright settings turn light areas pure white, and that detail cannot be recovered, so increase in small steps.

    Example: a product photo taken at home in the evening looks dull and yellowish. Try 130% brightness to lift the shadows, then compare it with the original — small steps keep the white areas from turning completely white and losing detail.

    Tips for Better Results

    • Try 110–140% for slightly dark phone photos.
    • Combine with Adjust Image Contrast if the picture looks washed out.
    • Compare with the original before sharing — screens differ.

    Frequently Asked Questions

    What does 100% mean?
    100% leaves the picture unchanged; lower is darker and higher is brighter, up to 300%.
    Which setting suits a dark phone photo?
    Try 110–140%. The default 120% gives a gentle lift.
    Why did white areas lose detail?
    Very bright settings turn light areas pure white, and that detail cannot be recovered.
    Works with: Windows Photos · Mac Preview · phone gallery · WhatsApp · websites · printing

    What converts well, and what doesn't

    SettingResult
    100%No change
    Below 100%Darker
    Above 100% (up to 300%)Brighter
    Default 120%A gentle lift
    Pure white areasDetail cannot be recovered
    💡 Tip: Try 110–140% for slightly dark phone photos.

    Common uses

    Night photosLighten them.
    Indoor photosLift shadows.
    Product photosBrighter listings.
    Too brightDarken photos.
    PrintingEasier to see.
    Old scansImprove faded pictures.

    Is my file safe?

    Browser processing: your files are processed on your own device and are never uploaded to our server.

    Advertisement
    Guide

    Adjust Image Brightness: a complete guide

    Why brightness matters

    Photos taken indoors, in the evening or against a bright window often come out too dark, while flash and sunlight can make them too bright. A small brightness change makes faces, products and documents much easier to see on phones, websites and prints.

    How it works

    The brightness value is a percentage: 100% leaves the picture unchanged, values below 100% darken it, and values above 100% brighten it, up to 300%. Each colour channel of every pixel is multiplied by that amount. Transparency is kept and the result is saved as a PNG.

    Finding the right setting

    Start with small steps: 110–130% fixes most slightly dark photos, 80–90% calms bright ones. Very high values make light areas pure white and that detail cannot be recovered. If a picture looks washed out after brightening, adding contrast often helps.

    Common problems and how to fix them

    White areas lost detail: use a lower value. The picture looks grey: combine with Adjust Image Contrast. Colours look different on another screen: screens vary — check on the device where the picture will mostly be seen.

    Good habits

    Adjust brightness before contrast, keep the original, and compare before and after side by side.

    Advertisement