Convert color PDF to grayscale
Convert a color PDF to grayscale (black and white). Useful for cheaper printing, scanner-style document archives, and accessibility.
Drag & drop a file
or browse from your computer · max 100 MB
Converting a PDF to grayscale strips color from every page, leaving only shades of gray. The most common reason: cheaper black-and-white printing. Printing in color costs 5-10× more per page than B&W on most office printers, so a 50-page color report becomes meaningfully more expensive to print colorful when grayscale is fine. Other reasons: matching scanner-style archive aesthetic for legal records, reducing distraction in study materials, or cutting file size (grayscale PDFs are typically 30-50% smaller than the color original).
How to pdf to grayscale step by step
- 1
Upload your color PDF
Drop the PDF you want grayscaled. Files up to 100 MB free, 200 MB on Pro.
- 2
We convert via Ghostscript
Ghostscript renders each page through a grayscale color space. Color text becomes black text. Color images become high-quality grayscale images using a perceptual luminosity formula (not just RGB averaging).
- 3
Download the grayscale PDF
Output is a standard PDF that opens in any reader with all visible content in shades of gray. Print quality on B&W printers is significantly better than printing the color original directly.
Why pdf to grayscale on PDFOnly
Perceptual luminosity, not RGB averaging
Naive grayscale just averages RGB values, which makes red look gray-medium and yellow look near-white — visually wrong. We use the proper luminosity weighting (~30% red, ~59% green, ~11% blue) that matches how human eyes perceive brightness.
Significant file size savings
Color PDFs typically reduce 30-50% in size after grayscaling — color information takes more bytes than grayscale equivalent. Your output is smaller and faster to share.
Lossless on text
Text remains crisp and selectable. Only the color information is reduced. Searchability and copy-paste are unchanged.
What people use pdf to grayscale for
A few common scenarios. If your workflow looks like one of these, this tool is a good fit.
Save on printing costs for long reports
A 100-page color report costs ~$10 to print at most copy shops. Grayscale: ~$2. Convert before submitting the print order, save the difference.
Match a scanner-style archive aesthetic
Some legal and corporate archives prefer everything in grayscale for visual consistency. Convert born-color PDFs to match the archive look.
Reduce visual distraction in study materials
Some readers find color highlighting and decoration distracting during long-form reading. Grayscale produces a cleaner, more focused reading surface.
Print cleanly on B&W-only printers
Some older or budget printers handle color PDFs poorly (slow rendering, color elements printing as muddy gray). Pre-converting gives consistent crisp output.
What you get
- Strips color while preserving full readability
- Reduces file size 30-50% (less color information to encode)
- Speeds up B&W printing — printer doesn't waste time interpreting color data
- Saves toner cost — color cartridges aren't used at all on the print job
- Lossless on text and line drawings; photos become high-quality grayscale
- Free, no signup, files auto-deleted in 1 hour
Frequently asked questions
Will text quality change?
No — text remains fully selectable, searchable, and crisp. Only the color information is converted. Black text stays black; colored text becomes the appropriate shade of gray based on its luminosity.
Can I un-grayscale (restore color)?
No — grayscale conversion is one-way. The color information is removed and can't be recovered. Always keep your original color PDF if you might need it later.
Will images look bad?
Photos look fine in grayscale (think of black-and-white photography). Diagrams that depend on color coding (e.g. red lines vs blue lines) lose meaning if their key was based on color — consider keeping those in color.
How much smaller will my PDF be?
Typically 30-50% reduction. Color information takes bytes; removing it shrinks the file. Combined with our Compress PDF tool afterward, you can reduce a 100 MB color PDF to 10-30 MB grayscale.
Will the printed output match what I see on screen?
Yes — grayscale conversion is calibrated for typical printer output. The screen preview matches what comes out of a B&W printer.
Can I convert just specific pages?
Not yet via the web UI — entire PDFs only. Workaround: use Split PDF to extract pages, convert those to grayscale, merge back in. The API on Pro plans supports per-page operation.
Does it work on scanned PDFs?
Yes — scanned PDFs already lean toward grayscale since most scanners produce grayscale by default. Running through this tool standardizes them at proper luminosity values.
Ready to pdf to grayscale?
Free to use for the basics. Files are auto-deleted within an hour and never used to train AI.
Open PDF to Grayscale