Files never leave your device.How it works
How to convert PDF to grayscale
- 1Drop your PDF above (or click to select).
- 2Choose a resolution (150 DPI is a good default).
- 3Click Convert, then download the grayscale images — all pages as a .zip.
Frequently asked questions
- Do my files get uploaded?
- No. Rendering and grayscale conversion happen entirely in your browser — your PDF never leaves your device.
- Is the output an image or a PDF?
- Images (one per page). Grayscale images are smaller and print cleanly. To rebuild a PDF, run the result through JPG to PDF.
- Why convert to grayscale?
- It removes color casts from scans, makes text easier to read, cuts file size, and prints without using color ink.
Clean, colorless page images
Color scans often carry a faint tint and are larger than they need to be. PDF to Grayscale renders each page and converts it to true grayscale in the browser, giving crisp black-and-white images that read well and print without color ink.
How it works
Each page is rendered at your chosen resolution, then desaturated with standard luma weights so the tones look natural. The result is a grayscale JPEG per page, downloadable individually or as one ZIP.
Notes and limits
Conversion is fully local, so even a sensitive scan stays on your device. Password-protected PDFs must be unlocked first. To turn the grayscale images back into a single PDF, use JPG to PDF.
Real reasons people convert to grayscale
Printing in color costs several times more per page than black-and-white on most office and home printers, so grayscale is a common step before printing long reports, course packs, or manuals nobody needs in color. It also matters for some court filings and compliance submissions that require black-and-white copies, and for older fax or scan-based workflows that only handle grayscale images anyway.
Grayscale is not the same as black-and-white
This tool produces true grayscale — a smooth range of gray tones — rather than pure black-and-white thresholding. That's the right choice for anything with soft shading, like scanned handwriting or photos, because detail is preserved instead of being crushed into stark black or white pixels. If you specifically need a high-contrast black-and-white line-art look (for a fax machine or an old scanner-based system), true grayscale will look softer than that.
When to skip this tool
Don't grayscale a document where color carries meaning — a chart with color-coded categories, a map with colored regions, or a diagram using color to distinguish parts will become confusing or unreadable once the color is gone. In those cases, keep the original color PDF, or consider whether the color-coding can be replaced with labels or patterns before converting.
After converting
Since the output is a set of images, not a PDF, run them through JPG to PDF once you're happy with them to get back a single document you can print or share.