Give a photo the warm brown tones of an old print. Set how strong it is, add a faded-paper look, and keep transparency if the file has it.
Runs every pixel through the standard sepia colour matrix, the same 3 × 3 set of weights that Photoshop and CSS filters use, so reds, greens and blues are redistributed into a single family of browns while the brightness of each pixel stays where it was. The Amount slider blends between the original colours and the fully toned result, so 50 percent is literally half-way. The picture is not resized or sharpened; only the colours change.
A 3000 × 2000 colour portrait shot on an overcast day looks cold and grey. At 100 percent sepia the skin becomes a warm tan, the grey sky a pale cream, and the navy coat a deep brown; the JPEG comes out around 15 percent smaller than the original because there is less colour detail to encode. At 60 percent the coat keeps a hint of blue, which often looks more like a real vintage print than the full effect. Turning on Faded print lifts the darkest values from 0 to about 28, the soft, slightly milky black you see on photographs that have sat in an album for fifty years.
Sepia suits portraits, weddings, street scenes and anything you want to feel timeless or nostalgic, and it is a quick way to make a mixed set of photos look like one series. It does not suit product shots, food or anything where the actual colour matters, and it will not rescue a badly exposed frame; fix brightness with Change Exposure first. If you want a modern, high-contrast two-colour look rather than a period one, Duotone Effect gives you control of both tones, and for a neutral result use Grayscale Image.
Amount is the only slider most people need: 100 is the classic effect, 40 to 70 is a subtle warm tint. Faded print raises the black point for an aged look; leave it off if you want punchy shadows. In Output, Same keeps the original file type; pick JPEG at quality 85 for the smallest file, or PNG if the image has transparency. The File name pattern adds a suffix so the original is never overwritten.
What is the difference between sepia and black and white? Black and white keeps only brightness. Sepia maps that brightness onto brown tones, warm in the highlights and dark chocolate in the shadows, the way silver prints toned with sepia chemistry aged. Use Grayscale Image for a neutral result and this tool for the warm one.
Why does 100 percent look flat on some photos? Full sepia removes every other hue, so a picture that relied on colour contrast, say a red jacket against green grass, loses that separation. Try 60 to 80 percent, or run Change Contrast afterwards to bring the shape back.
Does it keep transparent areas in a PNG? Yes. Only the visible pixels are recoloured and the alpha channel is untouched, so a logo with a transparent background stays transparent as long as you export to PNG or WebP.
Is my photo uploaded? No. The colour matrix runs on the pixels inside your browser; nothing is sent anywhere and it works offline once the page has loaded.