Drop any photo and convert it to black & white using proper luminance formulas, not just greyed-out pixels. Four tone profiles to choose from. All in your browser.
No tracking on your photos. Processing runs in the browser — nothing leaves your device.
The Contrast profile gives my street photography a gritty, high-contrast look I actually like. No Photoshop, no subscription.
Finally a tool that uses the actual luminance formula instead of just averaging RGB channels. The Natural profile is stunningly accurate.
I use the Sepia profile for my vintage portrait series. The warm tone is subtle, not overdone. Nothing comes close at any price point.
Client photos stay on my machine throughout. Non-negotiable for editorial work, and this is the only browser tool where that's actually true.
The Film profile adds that beautiful lifted-shadow, compressed-highlight look of actual orthochromatic stock. My architecture shots look timeless.
I batch-converted my entire wedding portfolio before a print show. The quality is indistinguishable from what I'd do in Lightroom in 45 seconds total.
As a UX designer I use the Natural profile to check contrast ratios before exporting assets. It's incredibly precise and instant.
The split preview shows you exactly what you're getting before you commit. Simple, clean and fast.
The Contrast profile gives my street photography a gritty, high-contrast look I actually like. No Photoshop, no subscription.
Finally a tool that uses the actual luminance formula instead of just averaging RGB channels. The Natural profile is stunningly accurate.
I use the Sepia profile for my vintage portrait series. The warm tone is subtle, not overdone. Nothing comes close at any price point.
Client photos stay on my machine throughout. Non-negotiable for editorial work, and this is the only browser tool where that's actually true.
The Film profile adds that beautiful lifted-shadow, compressed-highlight look of actual orthochromatic stock. My architecture shots look timeless.
I batch-converted my entire wedding portfolio before a print show. The quality is indistinguishable from what I'd do in Lightroom in 45 seconds total.
The human eye doesn't weight RGB channels equally. Our retinal cones are most sensitive to green (~59%), less so to red (~29%), and barely register blue (~11%). The Rec.709 luminance formula replicates this perception — and it's what separates a film look from a flat gray.
A tone profile isn't a filter — it's a different interpretation of light. Each of our four profiles applies a scientifically grounded transformation, not an arbitrary LUT or Instagram preset.
Drop a photo, choose how you want it to feel, take the result home. Every pixel is processed by your own CPU, right here in the tab.
JPEG, PNG, WebP, AVIF, HEIC — any image format your camera or phone produces. Click to browse or drag straight from your library.
Four profiles — Natural, Contrast, Sepia, Film — each a different algorithm applied per-pixel at full image depth. Switch instantly.
Your converted image downloads instantly as a high-quality JPEG. One click — never a form, never an email, never a watermark.
Phone filters, subscription apps, or a tool that respects your photographs and your privacy.
L = R×0.299 + G×0.587 + B×0.114 — replicates how the human eye weights color. A naive average (R+G+B / 3) produces flat, incorrect results: green and red are treated the same despite the eye being far more sensitive to green. Our Natural profile uses Rec.709 exclusively, which is why skin tones, skies, and foliage render with correct visual weight.Drop any photo and convert it to black & white in seconds — with the luminance formula your eye already uses. No sign-up, no upload, no limit.