QBMFX Black and white or grayscale images
Prepare a monochrome copy of a photo or document scan for ink-saving print workflows. Grayscale retains shades of gray, while black and white uses a brightness threshold to produce stronger separation between ink and paper. Select the mode that preserves the information in the original and inspect thin strokes, colored stamps and pale annotations before printing.
Choose your files and review the settings.
Keep originals and inspect the result before printing. File changes clear previous downloads. Heavy image and OCR work can take longer on a phone.
Using Black and white or grayscale images
- Choose image files.
- Select grayscale or black and white and adjust the threshold if needed.
- Save the converted images and inspect fine details.
Behind the result
Grayscale calculates luminance from the source colors. Black and white maps luminance to dark or light pixels according to the selected threshold. Neither operation adds detail missing from the original.
Free tools for everyday work
Book centers, photocopy shops, freelancers and developers can use this workspace without a paid plan or account. Files are processed locally. Prepare website resources from offline setup before disconnecting; Urdu/OCR also needs the separate pack above.
The Windows app currently includes the original four tools. These new Book Center tools are available on the website; app and extension updates will be separate releases.
Answers and practical details
Grayscale versus black and white
Use grayscale for photos, shaded charts and pale text. Use black and white for high-contrast text scans when the threshold preserves every required mark.
Price and account requirements
This website tool is 100% free. No login, subscription or paid conversion tier is required. Your device supplies the processing memory.
Files and privacy
Input documents and generated results are handled locally. They are not sent to a QBMFX conversion API or stored in a customer database. Website hosting and advertising can still make separate network requests.
Offline preparation
Prepare the website resources from Help while connected, then test the required tool offline. OCR and Urdu text tools also need their optional language or font resources prepared first. Browser storage can be removed by the browser or by you.
Windows app and Edge extension
The existing installed app and extension contain the original four PDF tools. These new Book Center tools belong to the website release; they will need a separate installed-package update.