Denoise Photos
Reduce film grain, scanner noise and phone-camera speckle while keeping edges, with a light, medium or strong setting and an option for JPEG blockiness.
- Light, medium or strong
- Keep fine detail
- JPEG artefact clean-up
Classic image processing Noise is reduced with non-local means filtering, a classic image-processing method. Strong settings smooth fine texture along with the grain.
Choose a photo
Before
After
Denoise Photo workspace
Drop your photo here
or choose a file · on a phone you can take a photo or pick one from your gallery
Ready
Working
Preparing your photo…
- Uploading
- Waiting in line
- Processing
- Loading the result
Most photos take under a minute. Larger photos and busy times take longer.
Finished
Compare the result
Drag the divider or use the arrow keys to compare. Zoom in to check fine detail; when zoomed, drag the picture or use the arrow keys on it to move around.
That did not work
What to expect
- Some fine texture, such as fabric or hair, is always softened along with the noise.
- Start with Medium and raise Detail if the photo looks waxy.
- It does not remove scratches or dust; use Remove Scratches for those.
Your photo is processed on a2z.tools servers. No third-party AI provider receives it, it is not used for training, and the upload and result are deleted automatically 60 minutes after processing finishes.
Related Tools
More tools in the same category
Other Tools
Popular tools from across A2Z
What Denoise Photo does
Grain and noise make an old photo look rough and hide detail, but blurring them away makes the whole picture soft. Denoise Photo uses a filter that compares similar patches across the image, so it can smooth noise while keeping edges.
Non-local means filtering
Noise is random from pixel to pixel, while real structure repeats: the same edge, texture or tone appears in many small patches of the photo. Non-local means filtering finds patches that look alike and averages them, which cancels much of the random noise while keeping the shared structure. Light, medium and strong set how different two patches may be and still be averaged.
The keep-detail slider blends some of the original texture back into the result, so a photo does not look waxy. The JPEG option adds a step that smooths the square blocks and ringing that heavy compression leaves behind.
Where denoising fits
Remove scratches before denoising, because noise reduction can smear scratches into soft streaks. Denoise before enhancing faces, restoring colour or upscaling, because each of those steps makes remaining noise more visible.
When to use it
- Grainy scans of high-speed film prints.
- Phone photos of old prints taken in dim light.
- Heavily compressed JPEGs with visible blocks and speckle.
How to use it
- Choose or drop the grainy photo.
- Pick light, medium or strong; medium suits most scans.
- Raise Keep detail if you want to preserve texture, or lower it for a smoother look.
- Switch on Reduce JPEG blockiness for heavily compressed files, then process the photo.
- Zoom in to compare texture before and after, then download or continue to the next step.
Limitations
- Some fine texture such as fabric, hair and the character of film grain is always softened.
- Very strong noise in dark areas can leave blotchy patches.
- Scratches and dust are not removed; use Remove Scratches from Photo.
- It does not sharpen; use Unblur Photo afterwards if edges look soft.
Privacy
Your photo is processed on a2z.tools servers. It is not sent to any third-party AI provider and is not used for training. The upload and the result are deleted automatically about 60 minutes after processing finishes, and straight away if processing fails or is cancelled. Results are returned only to the browser session that uploaded the photo.
Rate this tool
Was this tool useful? Your feedback helps us improve it.
Key facts
- Light, medium and strong noise reduction levels.
- A keep-detail slider balances smoothness against texture.
- Optional reduction of JPEG blockiness and ringing.
- Uses non-local means filtering, a classic edge-preserving method, not generative AI.
- Strong settings soften fine texture along with the noise.
How to use it
- Choose or drop the grainy photo.
- Pick light, medium or strong; medium suits most scans.
- Raise Keep detail if you want to preserve texture, or lower it for a smoother look.
- Switch on Reduce JPEG blockiness for heavily compressed files, then process the photo.
- Zoom in to compare texture before and after, then download or continue to the next step.
Frequently asked questions
Will denoising make my photo blurry?
It softens some fine texture, because texture and noise look alike at the smallest scale. Edges are kept because the filter averages similar patches rather than blurring everything. Raise Keep detail or choose Light if the result looks too smooth.
Should I choose light, medium or strong noise reduction?
Medium suits most scans and phone photos. Choose Light for photos with only a little grain or with texture you want to keep. Choose Strong for very grainy scans taken on high-speed film or in low light.
What does Reduce JPEG blockiness do?
Heavily compressed JPEG files show square blocks and halos around edges. This option smooths those artefacts in addition to reducing noise. Leave it off for good-quality files, where it can soften detail unnecessarily.
Is film grain the same as noise?
Not exactly. Grain is part of the character of a film photo, while scanner and sensor noise is random speckle. The tool reduces both. If you like the film look, use Light with a higher Keep detail value.
Can denoising remove dust and scratches as well?
No. Dust spots and scratches are larger than noise and are left in place. Remove them first with Remove Scratches from Photo, then continue here.
Why do dark areas look blotchy after denoising?
In very dark areas the noise can be stronger than the real detail, so the filter finds few matching patches. Try Medium instead of Strong, or raise Keep detail so a little texture is kept.
Last reviewed: