Grayscale PDF
Turn colour pages into clean grayscale — smaller files and tidier black-and-white printing, free.
Drop your file hereTap to add your file
or click to choose · sent securely, deleted right after
Private by design. Your file is sent over an encrypted connection, processed in an isolated sandbox with no internet access, then deleted the instant it’s done. We never store it or read it. How this works
Grayscale PDF converts the colour in your document to shades of grey. It’s useful for two reasons: the file usually gets smaller, and it prints cleanly on a black-and-white printer without odd colour casts. Text and images stay sharp — they just lose their colour.
The conversion runs on Ream’s hardened server: your file is sent over HTTPS, processed in an isolated sandbox, and deleted immediately afterwards. Free, no sign-up, no watermark.
How it works
Ream re-renders every page in a grayscale colour space, mapping each colour to an equivalent shade of grey. The layout, text and images are all preserved — only the colour is removed — and the result often takes up less space than the original.
How to Grayscale PDF
Add your PDF
Drop the file onto the box above or click to browse.
Run Grayscale PDF
Ream converts every page to grey.
Download the grayscale PDF
Save the result — the file is deleted from the server straight after.
Why convert a PDF to grayscale?
- Smaller files. Removing colour data often shrinks the PDF — handy for email and storage.
- Cleaner mono printing. Colours can print as muddy greys; converting first gives you predictable black-and-white output.
- A neutral look. Grayscale can make mixed-source documents feel consistent.
Pair it with Compress
Grayscale removes the colour; Compress then squeezes the images further. For the smallest possible scan or brochure, convert to grayscale first and compress second — the two together usually beat either one alone.
When you’ll use it
- Printing a colour document on a mono printer.
- Shrinking a scan or brochure for email.
- Giving a set of mixed documents a consistent look.
- Removing colour from signed paperwork before filing.
Why choose Ream
Smaller files
Dropping colour data usually shrinks the PDF, which helps with email and storage.
Clean mono printing
Predictable black-and-white output with no muddy colour casts.
Processed, then deleted
Sent over HTTPS, handled in an isolated sandbox, and deleted immediately after.
Free, no watermark
No account, no watermark, no limits.
Frequently asked questions
How do I convert a PDF to black and white?
Add the file and click Run Grayscale PDF. You download a version with every page converted to shades of grey.
Will it make my file smaller?
Usually, yes — removing colour data often reduces the size. Pair it with Compress for the smallest result.
Does it lower the quality?
Text and images stay sharp; only the colour is removed. The layout is unchanged.
Is this processed in my browser?
No — it runs on a hardened server. Your file is sent over HTTPS, processed in isolation, and deleted immediately afterwards.
Can I get the colour back afterwards?
No — grayscale is a one-way conversion, so keep your original if you may need the colour later.
Is my file stored anywhere?
No. It is deleted immediately after processing.