Upload an image to remove noise
Accepted formats: JPG, PNG, WEBP, BMP, GIF (non-animated)
Paste (Ctrl/⌘+V) or drop an image — or import from a URL
The denoise tool cleans up grainy, speckled and noisy photos using a median filter — the classic, edge-preserving way to remove image noise. Image Machine runs it entirely in your browser: upload a picture and a sliding window passes over it, replacing each pixel with the median of its neighbours so isolated specks, sensor grain and salt-and-pepper noise simply disappear. Because the median is a rank-order filter rather than an average, it removes that noise without the soft, smeared look a blur leaves behind — sharp edges, outlines and text stay crisp. Use the Strength slider to control how aggressively the noise is removed and the Radius slider to match the size of the grain you are fighting: a small radius despeckles fine sensor noise, a larger one tackles bigger blotches and compression artefacts. It is ideal for cleaning up photos shot in low light or at a high ISO, rescuing scans and old pictures, and smoothing JPEG noise before printing or sharing. Everything happens locally: your image is never uploaded, there is no sign-up, and there is no watermark.
How It Works
Choose a tool
Pick from 120+ tools to resize, convert, compress, or enhance your image.
Upload & edit
Drag and drop your image and adjust the settings. It stays on your device.
Download
Save your result instantly — no watermark, no sign-up required.
Why Image Machine?
Your files never leave your device
All processing runs locally in your browser. Your images are never uploaded to a server.
Completely free
Every tool is free, with no limits, no watermarks, and no hidden costs.
Lightning fast
No upload waiting — your images are processed instantly on your own device.
Professional quality
Pixel-perfect output with full control over format, size, and quality.
Frequently Asked Questions
How is denoising different from blurring?
A blur averages each pixel with its neighbours, which softens noise but also smears edges and fine detail. Denoise uses a median filter instead: it replaces each pixel with the middle value of its neighbourhood, so a stray bright or dark speck is simply outvoted and removed, while a real edge — where most neighbours are on one side — is preserved. The result is a cleaner image that still looks sharp rather than soft.
What do the Strength and Radius sliders do?
Radius sets the size of the window the median is taken over: a radius of 1 looks at a 3×3 block (good for fine grain), while a larger radius cleans up bigger blotches but removes more detail. Strength blends the filtered result with your original — at 100% you get the full median, and lower values keep more of the original texture for a gentler, more natural clean-up.
What kinds of noise can it remove?
It works best on the speckly noise you get from low-light or high-ISO photos, sensor grain, dust and scratches on scans, and salt-and-pepper noise (random black and white dots). It also softens blocky JPEG compression artefacts. Very heavy, structured noise may need a larger radius or a second pass, but for everyday grain a small radius usually does the job.
Is my image uploaded anywhere?
No. The denoising runs entirely in your browser on the HTML canvas, so your image never leaves your device and the tool keeps working offline once the page has loaded. It processes the pixels locally and exports the cleaned image as a PNG — there is no upload, no sign-up and no watermark.