Grayscale PDF — Convert Colour PDFs to B&W
Convert a colour PDF to grayscale by rasterizing each page and re-embedding it. Great for cheaper black-and-white printing.
Grayscale PDF converts a colour PDF into a black-and-white document by rasterizing each page onto a canvas with the CSS grayscale filter applied, then re-embedding the pages into a new PDF via pdf-lib. It is the most reliable way to guarantee grayscale output for cheaper printing.
All processing is 100% client-side. Your PDF is opened inside your browser tab, edited with pdf-lib (and rendered with pdf.js when needed), and saved as a Blob download. Nothing is ever uploaded to any server and closing the tab wipes every working buffer.
- Client-side grayscale conversion via canvas filter
- Three quality presets that trade sharpness vs. file size
- Preserves original page dimensions
- One-click preview and download
- No uploads
- 1Upload the colour PDF.
- 2Pick a quality preset.
- 3Press Grayscale — each page is filtered and re-embedded.
- 4Download the black-and-white PDF.
- High quality is best for print; Medium is best for email; Low is best for archival
- For a lossless grayscale export, use a source app that supports colour conversion natively
- This tool rasterizes — text becomes an image; not ideal for OCR-later workflows
PDF supports many colour spaces (RGB, CMYK, spot colours, ICC profiles), and applying a truly lossless colour-to-grayscale conversion means rewriting every colour object in every content stream. That is expensive and fragile. Rasterizing the page — rendering it to a canvas, applying a filter, and re-embedding — is the pragmatic browser-based approach: it works for every input and always produces predictable output.
Because rasterization replaces vector text with an image, the output PDF becomes larger for text-heavy documents and text is no longer selectable. For scanned or image-heavy PDFs the size difference is often small. If preserving selectable text matters more than guaranteeing grayscale, prefer a colour-to-grayscale conversion inside the source app (e.g. Print to PDF with grayscale option).
High quality renders at ~2x device pixel ratio and encodes JPEG at 92% — near-print quality. Medium renders at 1.5x, 85% quality — the everyday sweet spot. Low renders at 1x, 75% — archival-friendly. Pick the smallest that still looks acceptable on-screen at 100% zoom.
Your files never leave your browser. All parsing, page rendering and PDF assembly happens locally on your device using open-source libraries (pdf-lib and pdf.js). ilovedigital.in cannot see, store or share the contents of your documents.
Frequently asked questions
Common questions about the Grayscale PDF — Convert Colour PDFs to B&W tool and how your data is handled.
Is the resulting PDF text still selectable?
Will the output be larger than the input?
Are my files uploaded?
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