Convert PDF to Grayscale
Remove all colour from a PDF and convert every page to black and white. Reduces file size and optimises documents for printing.
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How to Convert PDF to Grayscale
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Save your result file. It's automatically deleted from our servers within 15 minutes.
Colour Removed
All pages are converted to pure black and white. Ideal for printing cost reduction.
Consistent Output
Pages are rendered at 1.5× resolution before converting — preserving detail in the grayscale output.
Compressed Output
The grayscale PDF is automatically compressed, typically resulting in a smaller file size.
What Is Grayscale PDF Conversion?
Converting a PDF to grayscale removes all colour information, rendering every page in black, white, and shades of grey. This is done by rasterising each page at 1.5× resolution using PyMuPDF's grayscale colourspace renderer and rebuilding the PDF from the resulting greyscale images.
The output is a standard PDF that prints identically on both colour and monochrome printers, and is often significantly smaller than the original colour document.
When to Convert a PDF to Grayscale
- Monochrome printing — Sending a colour PDF to a black-and-white printer produces muddy output. Converting to greyscale first ensures clean, predictable print results.
- Reducing file size — Colour image data accounts for a large portion of PDF file size. Greyscale conversion can reduce size by 50–80% for image-heavy documents.
- Printing costs — Many print shops and office printers charge per-page for colour. Grayscale conversion avoids unnecessary colour charges.
- Archiving — Greyscale versions of scanned documents are smaller and easier to store at scale.
- Accessibility — High-contrast greyscale improves readability for users with certain types of colour blindness.
Frequently Asked Questions
Is the text still selectable after conversion?
The current grayscale conversion rasterises pages to images, which means text in the output is no longer machine-readable or selectable. This trade-off ensures consistent colour removal across all content types. If searchable text is important, use the Compress PDF tool instead of Grayscale.
Will the file size be smaller?
Usually significantly smaller for colour-heavy documents. The greyscale image data for each page is compressed. Text-only PDFs may not see much reduction since they contain little colour data to begin with.
What resolution is used?
Pages are rasterised at 1.5× scale (approximately 108 DPI at standard A4 size). This is chosen to balance output quality against file size. For print-quality output, this is adequate for most documents.
Does this work on scanned PDFs?
Yes. Since the conversion rasterises the entire page as an image, it works on any PDF regardless of content type — including scanned documents, photos, and mixed-content files.
Are files deleted after processing?
Yes — both original and output files are deleted within 15 minutes.