Add Image Noise and Grain guide
Apply adjustable monochrome or color pixel noise to an image without uploading it.
What this tool does
The Add Image Noise tool adds a pseudorandom offset to each visible pixel’s color channels. The amount control sets the largest possible channel change. Monochrome mode applies one shared offset to red, green, and blue, producing neutral-looking grain. Color mode generates separate offsets for the three channels, producing colored speckles. Channel values are clamped to the valid 0–255 range and transparency is left unchanged.
Noise can be useful as a visual texture, a quick grain effect, or a way to compare how flat areas respond before compression. Every application uses a new random sequence, so processing the same source with the same controls can produce a different image. The generator is intended for visual effects, not cryptography, scientific simulation, sensor calibration, or privacy protection.
The effect covers the entire decoded image. It does not detect smooth regions, protect faces, simulate a named film stock, match camera sensor noise, or add monochromatic luminance noise in a calibrated color space. For reproducible production work, use software that records a random seed and supports layer blending.
How to use it
- Choose a JPG, PNG, or WebP source up to 25 MB for the noise effect.
- Set a modest noise amount, such as 10 to 25 percent.
- Keep Monochrome grain checked for neutral grain, or clear it for color noise.
- Select Add image noise to generate a new variation.
- Download the result, or run the operation again for another pattern.
Inspect shadow areas and smooth backgrounds at full size. Strong settings can clip dark pixels to black and bright pixels to white, reducing usable detail.
Benefits
- Offers separate monochrome and color noise modes
- Generates a fresh variation on each application
- Preserves width, height, and pixel alpha
- Avoids claiming a specific analog film simulation
- Enforces a safe decoded-pixel limit
- Processes and exports only in the current browser
Export and quality notes
Added noise often increases PNG and lossless file sizes because the pixels become less predictable. A lossy JPG or WebP encoder may soften fine grain or introduce blocks. Canvas re-encoding can remove source metadata and embedded profiles. Keep the original image because the effect is destructive in the downloaded copy.