Enhance Image
Adjust brightness, contrast, saturation, and sharpness with live preview
Drop an image here
Select an image to enhance
Max file size: 20MB
100% Private: All processing happens in your browser. Your files never leave your device.
Enhance Image combines three colour sliders — Brightness (50–200%), Contrast (50–200%), Saturation (0–200%) — with a Sharpness slider (0–100) that runs a real unsharp-mask technique: the tool draws a lightly blurred copy of your image, then pushes each pixel further away from that blurred version by an amount you control, which is how digital sharpening tools have worked for decades. An Auto Enhance button sets all four to a fixed combination in one click, and Reset returns them to their starting point.
That Auto Enhance button isn’t adaptive or AI-driven, whatever the marketing on this site’s catalogue page might suggest — reading the code shows it simply sets Brightness to 105%, Contrast to 115%, Saturation to 110%, and Sharpness to 40 every single time, regardless of what’s actually in your photo. It’s a reasonable starting point for an average phone photo, but it doesn’t analyse your specific image the way a real auto-enhance feature in dedicated photo software would.
How it works
1. Drop or browse your image
One file at a time, up to 20 MB, checked at the upload step.
2. Try Auto Enhance or adjust manually
Auto Enhance jumps straight to a fixed combination of settings; alternatively move each slider yourself for a specific look.
3. Fine-tune individual sliders
Brightness, Contrast, Saturation, and Sharpness each update the live preview the moment you release them, whether you started from Auto Enhance or from scratch.
4. Apply & Download
Renders every adjustment, including the unsharp-mask sharpening pass, onto the full-resolution image.
5. Reset or Start Over
Reset returns all four sliders to their defaults; Start Over clears the loaded image entirely.
When you'd use it
A flat, dull phone photo
Click Auto Enhance for an immediate, balanced lift in brightness, contrast, and saturation without hunting for the right numbers yourself.
A slightly soft product or document photo
Raise the Sharpness slider to add edge definition to a photo that’s a little out of focus, using the same blur-and-push technique real sharpening tools rely on.
Getting past what Auto Enhance gives you
Start from Auto Enhance’s fixed values, then nudge individual sliders further for a look the preset alone doesn’t quite reach.
Preparing a washed-out listing photo
A product photo shot in flat, even light often looks lifeless; increasing Contrast and Saturation together restores the visual punch a marketplace listing needs.
What Auto Enhance sets, exactly
One click sets Brightness to 105%, Contrast to 115%, Saturation to 110%, and Sharpness to 40 — always the same four numbers, on every image, regardless of how bright, flat, or sharp your photo already is. Reset takes all four back to their neutral starting point: 100%, 100%, 100%, and 0.
Because it’s a fixed preset rather than something that inspects your photo’s actual brightness or focus, Auto Enhance can occasionally push an already-bright or already-saturated photo too far. Treat it as a fast starting guess you can then correct with the individual sliders, not a guaranteed best result.
How the sharpening actually works
The Sharpness slider isn’t a simple filter — it renders a 1px-blurred copy of your image onto a hidden canvas, then for every pixel adds the difference between the original and that blurred copy, scaled by how far you’ve pushed the slider (up to a full 100% at the maximum setting). This is a classic unsharp-mask approach: it exaggerates the edges where brightness changes sharply, which is what reads as “sharper” to the eye.
It has a limit worth knowing: this technique amplifies whatever detail is already present at an edge, including sensor noise or JPEG compression artefacts on a low-quality source. On a genuinely blurred photo — one where the actual subject detail was never captured — pushing Sharpness higher mostly adds visible noise and haloing around edges rather than recovering detail that isn’t there.
Frequently asked questions
Does Auto Enhance analyse my photo before adjusting it?
No. It applies the same fixed combination — 105% brightness, 115% contrast, 110% saturation, 40 sharpness — to every image, regardless of that image’s actual brightness or focus.
How does the Sharpness slider work?
It uses an unsharp-mask technique: a slightly blurred copy of your image is compared against the original, and the difference between them is exaggerated at each pixel to make edges look crisper.
Can Sharpness fix a genuinely blurry photo?
Only mildly. It amplifies existing edge detail rather than recovering detail the camera never captured, so a badly out-of-focus source will mostly gain visible noise, not real sharpness.
Does this tool have a Hue control like Adjust Colors does?
No, Enhance Image covers Brightness, Contrast, Saturation, and Sharpness only. Use /image/adjust if you need to shift hue.
Will transparency in my image be kept?
A PNG source keeps its transparency. For any other format, the tool fills a white background behind transparent areas before exporting as JPEG, so those areas turn white rather than black.
Is there a cap on the image size I can enhance?
Yes, 20 MB per image, checked when you upload it.