Grayscale PDF
Turn a colour PDF into a grey one, ready for a mono printer. Add a file below and download the grey copy. It runs in your browser, so nothing is uploaded. No sign-up, no watermark, and no page limit beyond your device memory.
100% private. Your files are processed entirely in your browser and never uploaded.
Why grayscale a PDF with frisqoo
Nothing is uploaded
Your PDF is read and redrawn inside your browser. It never reaches a server, so there is nothing to delete later.
Every page goes grey
Photos, headings, logos and highlights all come out grey. The layout and page order stay as they were.
Text becomes pictures
Taking the colour out means redrawing each page, so text in the copy stops being selectable. You are told before you convert.
A whole batch at once
Drop several files and each is converted in turn, with a download button each and a ZIP for the lot.
Free, with no caps
No sign-up, no watermark, no daily quota, and no page ceiling. Your device memory is the only real limit.
Any device
Works in any modern browser on phone, tablet, or computer, and keeps working with the internet switched off.
How to convert a PDF to grayscale
- Drop a PDF into the box above, or click it to browse and pick one.
- Your file opens with page one already shown in grey, and a note beside it saying what the conversion costs.
- Click Convert to grayscale. You see the old size next to the new one, and the copy downloads with
-grayscaleadded to its name.
Everything runs on your device, so your document stays private, even with no internet once the page has loaded.
Is it safe to grayscale a PDF here?
Yes. Many free PDF sites upload your file to their own servers to do the work. This tool does not. Your PDF is read and redrawn right inside your browser, so it is never uploaded, stored, or seen by anyone else. That makes it a safe choice for payslips, medical letters, signed contracts, and anything else you would not want sitting on a stranger's server.
How the colour is taken out
Colour sits in several places inside a PDF at once: in the photos, in the text, in fills and in vector shapes. Rather than hunt for each one, the tool draws every page again at 144 dpi with the colour removed, then puts the grey pages into a new PDF at the original page size. That is why the result looks right everywhere, and also why each page arrives as a picture rather than as text.
What is kept, and what is not
Redrawing the pages costs you a few things. Here is the honest breakdown so there are no surprises:
- Every page, in the same order, at the same page size.
- The layout exactly as it looked, with photos and graphics in place.
- Your original file, untouched on your device. Only the copy is grey.
- Selectable text. Every page is a picture, so text cannot be selected, searched, or read aloud.
- Fonts, links, and bookmarks, which do not survive a page being redrawn.
- A guaranteed saving. Text documents often come out larger, and the tool says so when they do.
This tool does not make PDF/A archive files. If a submission asks for PDF/A, converting here will not give you one.
Will my file get smaller or larger?
Either can happen, depending on what is in the document. Scans and photo-heavy files usually get smaller. Files made of real text usually get larger, because text is stored as instructions for drawing letters, and a picture of that text is just pixels.
Three files from our own testing, on a deliberately slow two-core test setup. A one-page scan of 1.01 MB came down to 208.5 KB. A single dense page of 532.5 KB came down to 345.2 KB. A seven-page text document of 368.0 KB went up to 835.2 KB, and took under a second. If your copy comes out bigger than you want, run it through Compress PDF afterwards.
Why there is no quality setting
A quality setting on a grayscale tool does not change how grey the result is, only how big the file is. So there is one setting here and it is fixed: pages are drawn at 144 dpi, which is enough detail to print. Size is a separate job, and Compress PDF does it properly, with the real size of each level measured before you choose.
Converting password-protected PDFs
If your PDF asks for a password to open, this tool asks you for it too. Type it in, tap Unlock, and the file is unlocked on your device before it is converted. Your password stays on your device, the same as the file does. To take the password off the document for good, use Unlock PDF first, then convert the copy.
Grayscale several PDFs at once
Drop more than one file and each is converted in turn on your device, with no editor in the way. Every finished file gets its own download button, and the line beneath it shows the old size, the new size, and a warning if the copy came out larger. Rows are named after the file you will receive, so report-grayscale.pdf is the grey copy, not the one you dropped in. Download all as ZIP takes them together.
Can I grayscale a PDF on my phone?
Yes. It works in mobile Safari, Chrome, and other modern mobile browsers, with nothing to install. Every page is redrawn on your own device, so a long document takes longer on a phone than on a laptop, and the counter shows which page it has reached.
Common ways people use Grayscale PDF
- Printing a colour report on a mono office printer without using colour toner.
- Making coursework or handouts cheap to photocopy.
- Flattening a brochure to grey so it prints consistently in bulk.
- Preparing a file for a print shop that charges more for colour pages.
- Cutting a photo-heavy PDF down in size when colour was never needed.
FAQs about Grayscale PDF
Do my files get uploaded?
No. Every page is redrawn inside your browser on your own device. Your PDF never leaves your computer or phone, and nothing is stored. Close the tab and nothing is left behind.
What does grayscale do to my PDF?
Every page is redrawn with the colour taken out, leaving black, white and shades of grey. Colour photos become grey photos and coloured headings become grey headings. The page count, page order and page size stay the same.
Can I still select the text afterwards?
No. Taking the colour out means redrawing each page, so every page in the copy is a picture. Text cannot be selected, searched or read aloud. Your original file is not changed, so keep it if you need the text. If you want a grey copy you can still search, run the result through OCR PDF.
Why is there nothing to configure?
Because a quality setting would not change how grey the result is, only how big the file is. Pages are drawn at 144 dpi, which is enough to print. If you want to trade sharpness for size, do it in Compress PDF, where each level shows you the real file size first.
Will it make my file smaller?
Sometimes. Scans and photo-heavy files usually get smaller. Files made of real text usually get larger, because a page of text stored as a picture takes more space than the text itself. Both sizes are shown when it finishes, so you are not guessing.
My grey copy is bigger than the original. Why?
Because the original was mostly text, and text is cheap to store until it becomes a picture. Send the copy to Compress PDF afterwards if you need it smaller.
Can I convert a password-protected PDF?
Yes. If your PDF needs a password to open, the box asks you for it and unlocks the file on your device before converting. Your password never leaves your device. To take the password off the document itself, use Unlock PDF first.
Can I convert several PDFs at once?
Yes. Drop two or more files and each is converted in turn. Every finished file gets its own download button, and Download all as ZIP takes them together.
Is there a size or page limit?
No. There is no sign-up, no daily quota and no page ceiling. The only real limit is your device memory, since all the work happens there.
Does it work on a phone?
Yes, in any modern mobile browser, with nothing to install. Every page has to be redrawn, so a long document takes longer on a phone than on a laptop, and the counter shows which page it is on.
Is it free?
Yes. No sign-up, no watermark, and nothing added to your pages. There is no better result held back for a paid tier.