PDF to Black & White
Threshold a PDF to pure black and white — smallest files, crispest text.
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About the PDF to Black & White
PDF to Black & White thresholds every page of a PDF to pure black on white. The result is the smallest possible file size with maximally crisp text — perfect for scanned notes, forms, receipts and OCR pre-processing.
How to use
- Upload the PDF.
- Adjust the threshold slider if needed (default 150 works for most scans).
- Press Convert to B&W and download the result.
Benefits & key features
- Smallest possible file size.
- Crisp, high-contrast output.
- Adjustable threshold for faint handwriting.
- Great OCR pre-processing step.
Pro tip
If text comes out broken, lower the threshold (try 120). For very light handwriting, try 180+.
Why choose toolsfy for PDF tools?
Cloud-based PDF editors ask you to upload sensitive invoices, contracts or passport scans to servers you will never see — and then offer a "premium" plan to remove watermarks they added themselves. toolsfy turns that model upside down: every PDF operation on this page runs locally in your browser using the same modern Web APIs Chrome, Edge and Firefox ship with. Your file never leaves the device, no account is required, and there is no artificial cap on pages or size.
Common use cases
- Lawyers and accountants cleaning up scanned bundles of evidence before a client meeting, without sending them through a third-party server.
- University students assembling a single submission-ready PDF from multiple chapters, diagrams and reference pages — on a laptop with flaky campus Wi-Fi.
- Small-business owners stripping metadata, rotating scans, or watermarking product manuals before sharing them publicly on their website.
Frequently asked questions
Are my PDF files uploaded anywhere?
No. Every operation happens inside this tab using the PDF-lib / pdf.js libraries loaded from a public CDN. The file bytes never travel to a toolsfy server.
Is there a file-size or page limit?
The only limit is your device's available memory. A mid-range laptop handles hundreds of pages comfortably; a phone handles smaller files well but may slow down past 50 MB.
Do I need Adobe Acrobat or any desktop software?
No. A modern browser is all you need. The output PDF is standards-compliant and opens in Acrobat, Preview, Foxit and every other mainstream reader.