Sepia is not simply “grayscale plus brown”
The conversion remixes the RGB channels while keeping part of the original color. A blue sky, a red shirt and neutral paper therefore react differently instead of collapsing to the same brown-tinted gray.
Free browser tool
Apply sepia and hue adjustments to an image and export the result.
Add a sepia look and a cool-to-warm tone shift, then export the result as PNG. The source file is not overwritten; the processed image is created in your browser.
Whites and skin tones reveal color shifts quickly, so trust the preview more than the slider number.
The conversion remixes the RGB channels while keeping part of the original color. A blue sky, a red shirt and neutral paper therefore react differently instead of collapsing to the same brown-tinted gray.
Positive values push the image warmer by adding red and reducing blue; negative values move it cooler. If sepia alone feels too yellow or warm, a small move toward the cool side can bring the result back.
At high settings bright areas can look flatter and strong original colors can lose their character. For social images or documents, start around the middle and increase only if the effect is still too subtle.
Even when the source is JPEG, this tool exports PNG. That avoids another lossy JPEG pass, but photographic files can become larger. Compress or convert the saved result afterward if file size matters.