Black and white photo converter
Turn a colour photo into a black and white one: classic greyscale, or pure black and white for scans, signatures and stencils. Batch with a ZIP download, and nothing is uploaded.
Free · Runs in your browser · Updated 17 October 2026
Black and white photo converter
Settings
How to
Make a photo black and white.
- 1Choose your photos, or drop them on the box.
- 2Pick Black and white (greyscale) for a classic photo look, or Pure black and white for two tones; move the threshold until the result is clean.
- 3Download each image, or Download all as a ZIP.
How it works
Brightness the way eyes see it.
Each pixel becomes the grey of its perceived brightness: 29.9% of the red, 58.7% of the green and 11.4% of the blue (the ITU-R BT.601 weights used for black and white TV and JPEG). Green looks brightest to us, so it counts most; a plain average of the three would make blue skies and red lips look wrong.
- Pure black and white sets every pixel brighter than the threshold to white and the rest to black: ideal for documents, stamps and line art.
- For a signature on paper, the signature resizer cleans the background and sizes it for forms in one go.
- JPG files are saved as JPG (quality 92), WebP as WebP, and everything else as lossless PNG.
FAQ
Questions people ask first.
- How do I make a photo black and white?
- Open it in the tool above, keep “Black and white (greyscale)” and download it.
- What is the difference between greyscale and black and white?
- A “black and white photo” is usually greyscale: many shades of grey. Pure black and white has only two tones, which suits scans and line drawings.
- Can I turn a scanned document black and white?
- Yes. Choose Pure black and white and raise the threshold until the paper is white and the text stays solid.
- Does it work on iPhone photos?
- Yes, including HEIC photos, which are decoded in your browser.
- Are my images uploaded?
- No. Everything happens in your browser on your own device. Nothing is sent to Daniotech or anyone else.
Related
More free tools.
- Image colour inverterInvert the colours of an image (a negative): black to white, blue to yellow.
- Signature resizerClean, crop and resize a photo of your signature to the pixels and KB an application form asks for.
- Flip imageMirror a photo horizontally or flip it vertically, in a batch, without uploading.
- Image colour pickerPick the exact colour of any pixel in an image as HEX, RGB and HSL, plus its main colours.
From the team behind the tools
Need image handling inside your own app?
Daniotech builds web and mobile products, including upload flows that resize, convert and check images on the device before they reach your server.