Skip to content

Image Noise Generator

Add film grain or noise effect to images

Updated

What is the Image Noise Generator?

Add film grain and noise effects to any image instantly — right in your browser. This free online tool lets you apply four distinct noise algorithms (Gaussian, Salt & Pepper, Speckle, and Film Grain) with fine-grained control over intensity, monochrome grain, and output quality. Every image is processed entirely on your device, so nothing is uploaded to a server and your photos stay private.

Whether you are a photographer looking to restore an authentic analog feel to digital shots, a designer who needs textured overlays for posters and social media, or a developer stress-testing image-processing pipelines, this tool delivers professional results without requiring Photoshop, GIMP, or any desktop software.

Key features include a draggable before-and-after comparison slider, one-click PNG/JPEG/WebP export with adjustable quality, and a built-in sample image so you can experiment before uploading your own files. The noise engine uses mathematically accurate models — Box-Muller Gaussian distribution, luminance-weighted film grain curves, and probability-driven salt-and-pepper corruption — rather than simple random-pixel overlays, giving you realistic, physically-motivated textures every time.

How it works

The Image Noise Generator loads your photo into an off-screen canvas, reads its raw pixel data, and applies your chosen noise algorithm pixel by pixel. Because all processing happens on a <canvas> element inside your browser, the original image never leaves your device.

1. Upload or choose a sample

Drag and drop any PNG, JPEG, or WebP file onto the upload area, click to browse your files, or hit Use a sample image to generate an 800 × 600 gradient canvas with geometric shapes — perfect for quickly comparing noise types.

2. Pick a noise type

Four algorithms are available, each modelling a different real-world source of image noise:

  • Gaussian — Adds bell-curve-distributed random values to each colour channel, simulating electronic sensor noise in dim lighting.
  • Salt & Pepper — Randomly replaces entire pixels with pure black or white, mimicking dead or hot pixels on a camera sensor.
  • Speckle — Applies multiplicative noise (signal-dependent), preserving the underlying image structure while adding granular texture. Useful in radar and ultrasound imaging contexts.
  • Film Grain — A luminance-weighted additive model where noise intensity peaks in mid-tones and tapers off in shadows and highlights, faithfully reproducing the characteristic curve of photographic film.

3. Adjust the controls

  • Amount slider (0–100 %) — Scales the amplitude of the noise. At low values the effect is subtle; at high values the image becomes heavily degraded.
  • Monochrome grain — When enabled, the same random offset is applied to the R, G, and B channels, producing neutral grey grain. When disabled, each channel receives independent noise, creating colour-tinted grain typical of high-ISO digital cameras.
  • Regenerate noise — Because each pixel's noise value is generated randomly, clicking this button produces a completely different noise pattern at the same settings.

4. Compare before and after

Toggle Compare original to split the canvas with a draggable vertical divider. The left side shows the original image and the right side shows the noisy result. On mobile, a range slider beneath the image provides the same comparison without the need for pointer-drag interaction.

5. Download your result

Choose your output format in the download section:

Format Best for Quality control
PNG Lossless archival, transparency None (always lossless)
JPEG Photographs, smaller file sizes Adjustable 10–100 %
WebP Modern web, best compression Adjustable 10–100 %

Click Download to save the file. The output filename is derived from your original upload, with a -noisy suffix.

Examples

Add subtle film grain to a photograph

Apply a gentle analog film grain effect to a digital photo for a vintage aesthetic.

Upload a portrait photo, select Film Grain noise type, set amount to 25%, enable Monochrome grain
 
Downloaded PNG with realistic luminance-weighted grain that peaks in mid-tones

Generate salt and pepper noise for testing

Corrupt an image with random black and white pixels to simulate sensor defects or test image-processing algorithms.

Upload any image, choose Salt & Pepper noise, set amount to 50%
 
Image with random pure-black and pure-white pixel artifacts scattered across the frame

Create a textured overlay with speckle noise

Apply multiplicative speckle noise to preserve image structure while adding granular texture suitable for design overlays.

Load the sample image, select Speckle noise, amount 40%, disable Monochrome grain for coloured speckle
 
Downloaded WebP with signal-dependent noise that maintains the underlying gradient and shapes

Add heavy Gaussian noise to stress-test a pipeline

Degrade an image with high-intensity Gaussian noise to evaluate the resilience of compression or denoising algorithms.

Upload a test image, select Gaussian noise, amount 80%, download as JPEG at 90% quality
 
Heavily corrupted JPEG with bell-curve random offsets across all colour channels

Frequently asked questions

What types of noise can I add to an image?

The tool supports four noise types: Gaussian (bell-curve random offset per channel), Salt & Pepper (random black or white pixels), Speckle (multiplicative signal-dependent noise), and Film Grain (luminance-weighted noise that mimics photographic film). Each one models a different real-world noise source, so you can pick the effect that best matches your creative or technical goal.

Is my image uploaded to a server?

No. All processing happens locally in your browser using the Canvas API. Your image data never leaves your device, which means the tool works offline and your photos remain completely private.

What is the difference between Gaussian noise and Film Grain noise?

Gaussian noise adds the same level of random offset across the entire image regardless of brightness. Film Grain noise scales its intensity based on the luminance of each pixel — it is strongest in mid-tones and weaker in deep shadows and bright highlights — which is how real photographic film behaves. Film Grain also adds slight per-channel colour jitter for a more authentic analog look.

What does "Monochrome grain" do?

When Monochrome grain is enabled, a single random value is shared across the red, green, and blue channels for every pixel, resulting in neutral grey grain. When disabled, each channel receives an independent random value, producing a colour-tinted noise pattern that is more typical of high-ISO digital camera sensor noise.

Why do I get a different result each time I click "Regenerate noise"?

Noise values are generated using pseudo-random number algorithms (Box-Muller for Gaussian, Math.random() for the others). Each click produces a new set of random samples, so the texture pattern changes even though the amount and type settings stay the same.

What image formats can I upload?

The tool accepts any image format your browser supports, including PNG, JPEG, WebP, GIF, BMP, and SVG. After processing, you can download the result as PNG, JPEG, or WebP.

Is there a limit on image size?

The maximum supported dimension is 4096 pixels per side. If your image exceeds this, the tool will show a clear error message. For very large images, processing may take a moment since every pixel is processed individually.

Can I use this tool to make a photo look vintage?

Yes. Film Grain at 20–40 % with Monochrome grain enabled is a quick way to add an analog film aesthetic to digital photos. Pairing a low Gaussian noise amount with desaturation in an external editor can complete the vintage look.

Does the noise amount affect file size?

Yes, especially for lossless formats like PNG. Heavier noise introduces more unique pixel values, reducing the effectiveness of compression and increasing file size. For JPEG and WebP output, the quality slider gives you direct control over the trade-off between visual fidelity and file size.

Can I use this tool on a mobile device?

Absolutely. The interface is mobile-first and responsive. In comparison mode, a keyboard-friendly range slider is shown beneath the image so you can slide between the original and noisy versions without needing to drag a pointer.

Related tools

More utilities you might find handy.

Image

Avatar Generator - Placeholder & Initials Avatar Maker

Generate beautiful placeholder avatars with initials, gradients, pixel, identicon and geometric styles in seconds
Image

Color Picker From Image

Extract HEX, RGB, and HSL color codes from any image with pixel-perfect precision.
Image

EXIF Viewer Online

View EXIF data from any photo instantly in your browser — see camera model, shutter speed, aperture, ISO, GPS location, and date taken. 100% private, no upload.