Black and White Image

About Black and White Image

Make a black and white image the way each picture needs it. Document (clean scan, no shadows) turns a phone photo of a page into something that looks scanned: shadows and uneven light are taken out, the background goes white and the text black. Black & white (automatic) finds the right threshold by itself, so a signature or a gray-looking scan becomes crisp dark ink on white in one step. Grayscale keeps every shade, for portraits, old-style prints and documents for a mono printer, and its Contrast slider adds punch. When a form limits the file size of the signature, Compress Image to KB gets it under the limit.

For full control, Black & white (set the threshold) lets you decide where gray becomes black. The Black / white threshold starts at 128, the middle: raise it if faint pen strokes disappear, and lower it if the paper turns speckled. Dithered (for black-and-white printers) draws the shades with fine dots, so a photo still looks like a photo on a laser, receipt or label printer or an e-ink screen. Every black-and-white result is saved as a 1-bit PNG, with crisp edges, no gray JPEG fringes and a far smaller file. Transparent areas are filled with white, and a whole batch can be converted with the same settings.

How to use Black and White Image

1. 1
   Upload your images

   Choose or drop JPG, PNG, WebP or HEIC files, such as photos, scans or signatures.

2. 2
   Choose the result

   Under Convert to, pick Grayscale for photos, Document (clean scan, no shadows) for pages, or Black & white (automatic) for signatures.

3. 3
   Fine-tune if needed

   Grayscale has a Contrast slider. With Black & white (set the threshold), start at 128 and go higher or lower if the result is too faint or too dark.

4. 4
   Convert and save

   Click Black and White Image and download the files.

Why use Cubfile for this

• Five ways to convert

  Grayscale, automatic black and white, a clean document scan, your own threshold, or dithered dots.

• Phone photos as clean scans

  Shadows and uneven light go, leaving black text on white paper.

• Dithering for printers

  Fine dots instead of grays print well on laser, receipt and label printers and look right on e-ink.

• Crisp, small 1-bit PNG

  Black-and-white results have no gray JPEG fringes and take a fraction of the space.