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Adjust Image Contrast

Increase or decrease image contrast.

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

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

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    Harsh lighting?Use negative values to soften it.
    Fine detail hidden?Very high values push areas to pure black or white.
    Whiteboard photo?Try a contrast of about 40.

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    How to use Adjust Image Contrast

    1. Select your images.Add dull, foggy or faded pictures, or whiteboard photos.
    2. Set the contrast.Move the slider for stronger or softer contrast.
    3. Click Adjust Image Contrast.Save the crisper or softer version.
    4. Check the image.Adjust brightness first, then contrast.

    About Adjust Image Contrast

    When is it useful? Adjust Image Contrast makes dull, foggy or faded pictures look crisp, and can soften harsh pictures. It is especially useful for photos of documents and whiteboards, where stronger contrast makes the writing easier to read.

    Good to know: values from −100 to 100 are allowed; 0 leaves the picture unchanged, positive values increase contrast and negative values reduce it. The default is 25. Very high values push dark areas to black and light areas to white, which can hide fine detail.

    Example: a photo of a whiteboard taken in a classroom often looks grey and faded. Set contrast to about 40, and the marker writing becomes darker while the board becomes whiter, so the notes are much easier to read when you share them with classmates.

    Tips for Better Results

    • For document photos, try 30–50 together with Grayscale Image.
    • Use negative values to soften very harsh lighting.
    • Adjust brightness first, then contrast.

    Frequently Asked Questions

    Which values can I use?
    From −100 to 100. 0 changes nothing, positive values add contrast, negative values soften it. The default is 25.
    What works for document photos?
    Try 30–50 together with Grayscale Image.
    Why did fine detail disappear?
    Very high values push dark areas to black and light areas to white.
    Works with: Windows Photos · Mac Preview · phone gallery · WhatsApp · websites · printing

    What converts well, and what doesn't

    SettingResult
    0No change
    Positive (up to 100)More contrast
    Negative (down to −100)Less contrast
    Default25
    Whiteboard photosAbout 40 makes writing darker
    💡 Tip: Adjust brightness first, then contrast.

    Common uses

    WhiteboardsReadable notes.
    Document photosClearer text.
    Foggy photosLook crisp.
    Faded picturesStronger colours.
    Harsh photosSoften contrast.
    PrintingBetter prints.

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    Guide

    Adjust Image Contrast: a complete guide

    What contrast is

    Contrast is the difference between light and dark parts of a picture. Low contrast looks foggy, dull or washed out; high contrast looks crisp and punchy. Photos through windows, on hazy days, of whiteboards and of faded documents usually need more contrast.

    How it works

    Choose a value from −100 to 100; 0 leaves the picture unchanged and the default is 25. Positive values push light tones lighter and dark tones darker around the middle grey; negative values pull them closer together for a softer look. Transparency is kept and the result is saved as a PNG.

    Using contrast for documents

    For photos of notes, whiteboards and printed pages, a value of 30–50 makes writing stand out from the paper. Combine it with Grayscale Image for a clean, scan-like result that is easy to read and prints well.

    Common problems and how to fix them

    Dark areas became pure black: use a smaller value. The photo still looks dark: adjust brightness first, then contrast. Skin tones look harsh: use a gentler value such as 10–20 for portraits.

    Good habits

    Make small changes, keep the original, and check the result on a phone screen as well as a computer.

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