Drain a photo to black and white or make its colours twice as strong with one slider. Preview against the original, then save as JPEG, PNG or WebP.
Converts each pixel to hue, saturation and lightness, multiplies the saturation by the amount you set, and converts it back. Hue and lightness are untouched, so a red jumper stays the same red and the same brightness; only how strong the colour is changes. At 100 nothing happens, at 0 the photo is black and white, at 200 every colour is twice as intense. The preview updates as you drag, and holding Space shows the original for a direct comparison.
A flat, overcast street photo at 4000 × 3000 usually looks best around 125 to 135: the brick and the shop signs regain their colour without the sky turning cyan. The same photo at 60 gives the washed-out, faded film look that is popular for lifestyle shots. Product photos for a listing often want 110 to 115 so the item matches the real thing without looking edited. Saved as JPEG at quality 92 the file size barely moves, since the pixel count is the same.
Use it to correct a dull photo from a phone in poor light, to fade a picture for a background, or to strip colour entirely. If faces are in the shot, try Change Vibrance first; it boosts weak colours more than strong ones and keeps skin natural. If a single hue is wrong rather than everything being dull, Adjust HSL or Adjust Hue shift colours instead of strengthening them. For a black and white conversion with more control over which tones go light or dark, use Grayscale Image.
Amount is a percentage of the original saturation: 50 halves it, 150 adds half again. The chips jump to common values. Output Same keeps the original file type; pick PNG for a lossless save or WebP for a smaller one. Because the adjustment is per pixel, a photo with a lot of near-grey pixels changes less than a colourful one at the same setting.
What is the difference between saturation and vibrance? Saturation multiplies the colour strength of every pixel equally, so already-vivid colours get pushed hardest and can clip. Vibrance boosts the dull colours more than the strong ones and goes easier on skin tones. Use Vibrance for portraits and Saturation for graphics, product shots or when you want a deliberate pop.
Does 0 give me a proper black and white photo? Yes. At 0 every pixel keeps its lightness and loses its hue, which is the same result as the Luminance method in Grayscale Image. That tool adds other conversion methods and a partial-blend slider if you want more control.
Why do some areas turn flat orange or blue at 200? Doubling saturation pushes values past the limit of what a pixel can store, so gradients in skin, sunsets and skies flatten into a single clipped colour. Stay under 150 for photos, or use Vibrance, which protects colours that are already strong.
Is the picture uploaded? No. The colour maths runs on your own device in the browser. You can switch off Wi-Fi after the page loads and it still works.