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Film grain adds the fine, speckled texture of analog film — or the noise of a digital sensor — back into a clean photo. A perfectly smooth, flat image can look sterile or obviously digital; a layer of grain restores the organic, tactile feel of real film and is a staple of vintage, cinematic, lo-fi, and “analog” looks. This tool overlays a controllable grain field directly on the HTML canvas in your browser. Amount sets the intensity, Grain size controls how fine or chunky the speckle is, and a Monochrome toggle chooses between classic gray film grain — a single luminance speckle added equally to Red, Green, and Blue, so your colors and hue are left intact — and colorful sensor-style noise that varies each channel independently. The grain is drawn from a zero-mean noise field, which means it adds and subtracts in equal measure: your photo gains texture while its overall brightness and exposure stay essentially the same (apart from a touch of clamping in near-black and near-white areas). The pattern is generated deterministically, so the same image and the same settings always produce the identical grain — re-run or re-download and you get a pixel-for-pixel match. Everything runs locally: your image is never uploaded, the alpha channel is untouched so transparency is preserved, and there's no sign-up and no watermark.
How It Works
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All processing runs locally in your browser. Your images are never uploaded to a server.
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Pixel-perfect output with full control over format, size, and quality.
Frequently Asked Questions
What's the difference between monochrome grain and colorful noise?
Monochrome grain adds the exact same random offset to a pixel's Red, Green, and Blue at once, so the speckle is neutral gray and the pixel's hue is preserved — this is what real black-and-white and color film grain looks like. Turning Monochrome off gives each channel its own independent offset, producing colorful red/green/blue noise like the chroma noise from a digital camera shot at high ISO. Monochrome is the more natural, filmic choice; colorful noise suits a glitchy or heavily-digital look.
Will adding grain change my photo's brightness or colors?
Not meaningfully. The grain is zero-mean — drawn so positive and negative speckles balance out across the image — so the average brightness stays essentially the same. In monochrome mode the offset is identical on all three channels, so hue is preserved and only texture is added. The one minor exception is clamping: when a channel is already near 0 or 255, a speckle that would push it past the limit is clipped, so very dark and very bright areas show slightly less grain (and in colour mode a clipped channel can nudge the hue a touch) — exactly as real film behaves.
What does Grain size do?
Grain size sets how coarse the speckle is. At size 1 the noise changes on every pixel, giving a fine, tight grain. At larger sizes the same noise value covers a small square block of pixels (2×2, 3×3, up to 4×4), producing chunkier, more visible grain — useful for a heavier pushed-film or lo-fi aesthetic, or to keep grain visible after the image is scaled down. Combine a higher Amount with a larger size for a strong vintage texture, or keep both low for a subtle finish.
Is my image uploaded anywhere?
No. The entire effect runs in your browser on the HTML canvas — your photo never leaves your device, nothing is sent to a server, and there's no sign-up and no watermark. Because the grain pattern is deterministic, you can re-run the tool with the same settings and get an identical result every time. The output keeps your image's transparency (alpha) intact and can be downloaded as a PNG.