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Brightness and Contrast Editor

Adjust brightness, contrast and saturation with live sliders — 100% is neutral on each. Downloads as a lossless PNG.

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Quick Answer

Load an image and adjust three sliders — brightness, contrast and saturation — each from 0 to 200%, where 100% leaves the image unchanged. The preview updates live as you drag, using the browser's built-in image filters. Below 100% dials an effect down (toward black, flat grey, or grayscale); above 100% pushes it up. Download a lossless PNG, made entirely in your browser.

What the Brightness and Contrast Editor Does

This adjusts an image's tone and colour with three controls. Brightness makes the whole picture lighter or darker, contrast stretches or compresses the gap between light and dark, and saturation makes colours more vivid or more muted. So despite the name, this is a brightness, contrast and saturation editor.

Each slider runs 0 to 200%, and 100% is neutral — it leaves that channel untouched. The adjustments are global: they apply evenly across the whole image rather than to a selected area, and the preview updates in real time so you can settle on a look before saving.

How It Works

Drop or pick an image. It is drawn onto a canvas in your browser.

Drag the brightness, contrast and saturation sliders. The tool sets the canvas filter to brightness, contrast and saturate at your chosen percentages and redraws, so the preview is the exact result.

Download saves a lossless PNG at the original dimensions. The canvas re-encode also strips EXIF and GPS metadata.

Processing pipeline

  1. Decode locally. Your image is drawn onto a canvas in the browser — never uploaded.
  2. Set the three filters. Your brightness, contrast and saturation percentages become a single canvas filter string.
  3. Render in one pass. The browser applies brightness, contrast and saturate together as the image is redrawn.
  4. Export the PNG. The adjusted canvas is saved as a lossless PNG with your original base name.

The filter applied

brightness(B%): B = 100 unchanged, 0 = black, 200 = twice as bright contrast(C%): C = 100 unchanged, 0 = flat grey, 200 = double contrast saturate(S%): S = 100 unchanged, 0 = grayscale, 200 = extra vivid
Worked example
At the defaults (100% / 100% / 100%) the image is unchanged. Set brightness 120, contrast 115 and saturation 130 and the picture comes out lighter, punchier and more colourful in a single pass.

100% is the neutral point on every slider. Values below 100% reduce the effect; above 100% intensify it. The three combine into one canvas filter applied in a single render.

Privacy

Your image is processed entirely in your browser and never uploaded — there is no server.

The canvas re-encode strips all EXIF and GPS metadata, so the saved PNG carries no camera or location tags.

No account, no stored copy; everything is gone when you close the tab.

Technical Details

ControlsBrightness, contrast, saturation
Range0–200% each (100% neutral)
ScopeWhole image (global)
Output formatPNG (lossless)
DimensionsUnchanged
MetadataEXIF/GPS stripped
Processing100% in-browser

Standards & references

  • CSS filter functions — Uses the standard brightness(), contrast() and saturate() filter functions, where 100% is the neutral value.
  • Canvas 2D filter — The browser's native canvas filter applies the adjustments as the image is redrawn.

Accuracy & Limitations

These are global adjustments, applied evenly to the whole image. The tool does not do curves, levels, white balance, per-channel control, or selective edits on a region.

100% is neutral on every slider. Push one far from 100% and detail can clip: very high brightness or contrast blows out highlights and crushes shadows, and that lost detail cannot be recovered by dialling back.

Contrast pivots around mid-grey, so raising it brightens highlights and darkens shadows at the same time. Saturation at 0% gives a grayscale result; well above 100% can push colours until they look unnatural.

Output is a lossless PNG at the original dimensions, so the edit itself adds no compression artefacts — though a PNG of a photo can be larger than the original JPEG.

Real-World Use Cases

Rescue a dark photo

Lift the brightness on an underexposed shot and add a little contrast to bring it back.

Make colours pop

Nudge saturation and contrast up for a punchier, more vivid look.

Tone down a harsh image

Lower contrast or saturation to soften an over-processed picture.

Match a set of images

Apply the same settings to several pictures so they share a consistent look.

When to use it — and when not to

Good for

  • Quick global brightness, contrast and saturation tweaks
  • Rescuing a slightly dark or flat photo
  • Making colours more (or less) vivid

Not the best choice for

  • Selective edits on one part of an image
  • Curves, levels or white-balance correction
  • Recovering detail already clipped to black or white

For grayscale use the grayscale converter; to invert colours use the colour inverter; for region-by-region edits, curves or levels, use a full photo editor.

Frequently Asked Questions

Does this change saturation too, or just brightness and contrast?
It changes all three. Alongside brightness and contrast there is a saturation slider, so you can also make colours more vivid or more muted. The name undersells it slightly — think of it as a brightness, contrast and saturation editor.
What does 100% mean on each slider?
100% is the neutral value: it leaves that channel exactly as it was. Below 100% reduces the effect and above 100% intensifies it, on all three sliders.
What happens at 0%?
Brightness at 0% gives a black image, contrast at 0% gives a flat mid-grey, and saturation at 0% gives a grayscale image. Those are the standard endpoints of the CSS filter functions used here.
Can it brighten a dark photo?
Yes — raise the brightness slider, and usually add a touch of contrast. Bear in mind that areas already crushed to pure black hold no detail to recover, so brightening them just lifts them to grey.
Why does raising contrast lose detail?
Contrast pivots around mid-grey, pushing bright pixels brighter and dark pixels darker. Past a point the brightest areas clip to pure white and the darkest to pure black, and that clipped detail is gone.
Are the edits applied to the whole image or a selection?
The whole image. Every slider is a global adjustment, so there is no way to brighten or saturate just one region with this tool.
Does it do curves or levels?
No. It applies simple global brightness, contrast and saturation filters. For curves, levels, per-channel control or white balance, use a dedicated photo editor.
What format do I get?
A lossless PNG at the original dimensions, saved with your original base name. PNG keeps the edit free of extra compression loss.
Does it resize my image?
No. The dimensions stay the same; only tone and colour change.
Does it strip EXIF and GPS data?
Yes. The canvas re-encode removes all metadata, so the output has no camera or location tags.
Is my image uploaded?
No. Everything runs in your browser, with no server and nothing stored.
Can I undo a strong adjustment after saving?
Reset every slider to 100% before you save to get the untouched image back. But once you have saved a clipped result and discarded the original, the lost highlight or shadow detail cannot be recovered.

References

Despite the name, this adjusts brightness, contrast and saturation — three live sliders, each neutral at 100% — using the browser's native canvas filter, then exports a lossless PNG. The adjustments are global, and the canvas re-encode strips EXIF and GPS metadata. Everything runs in your browser.

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