PDF to Grayscale
Convert a PDF to grayscale to save toner when printing. Choose a DPI and which pages to convert.
Quick answer: Convert a PDF to grayscale to save toner when printing. Choose a DPI and which pages to convert.
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Frequently asked questions
- How do I convert a PDF to grayscale?
- Drop the PDF, choose a DPI (150 is fine for most documents), and click Download grayscale PDF. Every page is re-rendered as a neutral grey image.
- Will grayscale reduce file size?
- Sometimes — colour photos compress slightly smaller in greyscale, especially when JPEG-encoded. For text-heavy PDFs the change is minor; for scan-heavy PDFs it can be substantial.
- Will text remain sharp?
- Pick 200 or 300 DPI for crisp text. At 150 DPI text is still readable but slightly softer than the original vector text.
- Does it work on scanned PDFs?
- Yes. Scans are just embedded images; converting to grayscale is essentially desaturating those images.
- Can I grayscale only selected pages?
- Yes. Type a page range like 2-5 in the Pages field — only those pages are converted, the rest stay in colour.
- Is it free?
- Yes. No signup, no watermark, no page limit.
- Are my files stored?
- No. The PDF never leaves your device — conversion runs entirely in your browser.
- Can I do this on mobile?
- Yes. Works in mobile Safari and Chrome.
- Why do some images look too dark?
- Greyscale conversion uses perceptually neutral weights (R: 0.299, G: 0.587, B: 0.114). Images with strong saturated colours sometimes look darker because saturation is gone — adjust the source image's brightness first if needed.
- Can I revert back to colour?
- Once a PDF is greyscale, the colour information is gone. Always keep the original colour PDF as a backup before converting.