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Noise level
Strength of the noise

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Add noise to image

Add noise to images online. Control noise level and strength, optional film grain—turn photos into grainy or noisy images, preview, download PNG in your browser.

What is image noise?

Image noise adds random grain to pixel colors—whether you want noise on image, a grainy photo, or a film grain filter look. Noise level sets how many pixels are affected; strength sets how strong each offset is. Monochromatic mode uses one random value per pixel for grayscale grain; color mode randomizes each RGB channel. Upload, adjust sliders, preview automatically, and download PNG—all processing runs in your browser.

Noise controls

Amount, strength, and monochromatic grain for noisy images and photos.

  1. Noise level 0 to 100: Control what share of pixels receive random grain offsets.
  2. Strength 0 to 100: Set how strong each noise offset is on affected pixels.
  3. Monochromatic toggle: Switch between grayscale film grain and color speckle.
  4. Automatic preview: Noise on image updates as you adjust sliders—no apply button.
  5. New grain patterns: Nudge noise level or strength to re-roll the random speckle layout.
  6. PNG download: Save the result as add-noise-image.png.

How to add noise to an image

Steps to create grainy photos and noisy images online.

  1. Upload or pick an example: Drop your file, or click a sample thumbnail to try noise instantly (15 MB max).
  2. Set noise level and strength: Start around 40–60 noise level for visible grain; lower for subtle texture.
  3. Choose monochromatic: Enable for film grain; disable for RGB color noise.
  4. Download PNG: Adjust sliders to try another grain pattern, then save the noisy image.

Tips for adding noise

Get better grain results on photos and images.

  1. Start with monochromatic: Film-style grain usually looks best with grayscale noise enabled.
  2. Use low noise level first: Try noise level 20–40 with strength 30–50 for subtle texture.
  3. Re-roll the pattern: Nudge noise level or strength by one step to generate a new grain layout.
  4. Pair with contrast: Slightly boost contrast after grain for a punchier retro look.
  5. Keep PNG for logos: Alpha is preserved when adding noise to transparent assets.
  6. Avoid heavy noise on text: High strength on small type reduces readability—use light grain only.

When to add image noise

Typical uses for grain and noise effects on photos and graphics.

  1. Film grain look: Soften overly clean digital photos with monochromatic grain.
  2. Grainy photo style: Give flat shots a textured, analog feel before posting.
  3. Retro posters: Add texture to flat vector exports or social graphics.
  4. Mock distressed assets: Preview noisy backgrounds before printing or compositing.
  5. Design experiments: Test grain intensity on UI mockups or photo placeholders.
  6. Glitch-adjacent styles: Combine high amount and strength for heavy speckle effects.

Why use this noise tool

Benefits of browser-based grain and noise filters.

  1. Two clear controls: Separate coverage (amount) from intensity (strength).
  2. Grayscale or color: Monochromatic toggle matches classic film grain workflows.
  3. Private: Images stay on your device—no server upload.
  4. Instant preview: See grain strength before download.
  5. No install: Works in any modern browser with Canvas 2D.
  6. Free: Unlimited previews and downloads.

Technical details

How noise is applied in this tool.

  1. Algorithm: Per pixel: if random < noise level/100, add random offset in ±(128 × strength/100)/2 range; clamp to 0–255.
  2. Monochromatic mode: Same offset added to R, G, and B when enabled.
  3. Color mode: Independent random offsets on each RGB channel.
  4. Rendering: Canvas 2D getImageData / putImageData; alpha unchanged.
  5. Input limits: 15 MB; longest edge 8192 px.
  6. Browser support: Chromium, Firefox, Safari with Canvas 2D.

Frequently Asked Questions

Have questions? We have answers.

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