Image Enhancer

Frequently Asked Questions

Is the Image Enhancer free?

Yes, 100% free. No account, no subscription, no watermarks, and no limits on how many images you can process.

Are my images uploaded to a server?

No — every operation runs locally in your browser using the Canvas API. Your image data is never sent anywhere.

How does the sharpening work?

Sharpening uses a 3×3 convolution kernel (the classic unsharp-style Laplacian sharpener) whose strength is scaled by the intensity slider. At 0% the image is unchanged; at 100% the full kernel is applied.

What is the difference between Gaussian and Box blur?

Gaussian blur weights pixels with a bell-curve distribution, producing a natural, smooth result similar to camera defocus. Box blur averages all pixels in a square neighbourhood equally — it's faster but can look slightly harsher at high radii.

How does noise reduction work?

It uses a median filter — for each pixel it collects all values in the neighbourhood, sorts them, and picks the middle value. This removes salt-and-pepper noise while preserving edges better than a simple blur would.

What does Auto Enhance do?

Auto Enhance applies auto levels (stretching each RGB channel's histogram to the full 0–255 range to maximise contrast) followed by a subtle vibrance boost that increases colour saturation without clipping highlights.

What information does the Histogram tab show?

The Histogram tab shows overlapping R, G, B channel bar charts alongside stats: mean brightness, contrast (standard deviation of luminance), darkest and brightest pixel values, estimated colour temperature (warm/cool/neutral), and the dominant colour.

Does the tool work on mobile?

Yes, it works on all modern browsers including mobile Safari and Chrome on iOS and Android. The before/after comparison slider is fully touch-friendly.