PDF to Black & White
Convert every page of a colour PDF to grayscale or pure black-and-white — for portals that specifically ask for a monochrome scan, or simply to get a smaller, cleaner file for printing.
How it works
- Choose grayscale (soft tones) or pure black & white (high contrast, best for text scans).
- Applies to every page in one pass.
Private by design
The file never leaves your device — everything runs inside your browser tab using JavaScript PDF libraries, with nothing uploaded to any server. That also means there's no per-day limit on how many files you process, since nothing is metered on a server.
Good to know
The finished file downloads straight to your device's normal Downloads folder with a new file name, so the original stays untouched and you can tell the two apart at a glance.
Frequently asked questions
Does this reduce the file size too?
Usually yes — grayscale/monochrome images compress smaller than colour ones.
Is there a sign-up or a watermark?
No — no account needed and the output file carries no watermark.
Does it work on mobile?
Yes, it runs in any modern mobile browser on Android or iPhone, not just on desktop.
Is my file kept or deleted after processing?
Neither — it's never uploaded in the first place, so there's nothing stored on any server to delete.
Reviewed by Manoj Pathak & Pallavi Yadav, Toolzo team — updated 23 September 2026.