True monochrome with a contrast slider — from soft documentary grey to punchy high-contrast, on your own device.
One image · processed on your device, nothing is uploaded
No size limit · files are processed on your device and never uploaded · how it works
Runs in your browser. Files are never uploaded — you can go offline after the page loads.
How to use the Black & White Image
Drop one image.
Set the contrast — monochrome preview updates live.
Download at full resolution.
Easy to use
Drop files, pick options, download. Whole folders at once, no signup, no daily limit.
Best quality
The same engines the professionals use — SVGO, resvg, MozJPEG, libwebp, libavif — compiled to run in your browser.
Private & secure
Files are processed on your device and never uploaded. Close the tab and nothing remains anywhere.
Grey is not monochrome
Strip the colour from a photo and you usually get something flat — because colour was carrying the contrast.
Black & white film never had that problem: its response curves added punch naturally. The contrast slider here
recreates that, and 20–40 is where most photos snap into the look you actually wanted.
Black & white earns its keep on portraits (skin evens out, expressions dominate), busy street scenes (shape
beats colour noise) and anything destined for print. Your colour original is never modified — the conversion
happens on a copy, on your device.
Frequently asked questions
Why do my black & white photos look flat?
Plain grayscale conversion keeps the colour image’s contrast, which often reads as dull. Adding 20–40 contrast — the slider here — recreates what black & white film did naturally, and is the difference between grey and monochrome.
Is the colour information recoverable?
No — the download is truly monochrome. Keep your colour original; the tool never modifies it.
Most online converters upload your file to a server. InfyTool ships the actual encoders to your browser as WebAssembly instead, so processing happens inside your tab — faster for batches, and nothing to delete afterwards.
No upload, ever. Turn off Wi-Fi after the page loads and every tool keeps working.
No limits. No file-size cap, no queue, no watermark, no account.
Runs on your CPU. Batches use several cores in parallel; nothing is throttled.