Convert PDF to grayscale
Turn a color PDF into grayscale (black and white) for free — ideal for cheaper printing and smaller files, entirely in your browser. Your file is never uploaded to a server.
How to convert a PDF to black and white
- Open the Grayscale tool and add your PDF — drag and drop it, or click “Choose files.”
- Convert. Every page is rendered in grayscale.
- Download. The black-and-white PDF is generated on your device and saved to your Downloads folder.
Grayscale a PDF without uploading it
Most “PDF to grayscale” websites upload your document to their servers. LambiPdf converts pages to black and white using your own browser, so your files never leave your computer. Grayscale is great for printing on a mono printer, cutting ink costs, and often reduces file size too. It's free, needs no account, and adds no watermark.
More free PDF tools
Grayscale PDF — FAQ
Is converting PDFs to grayscale free?
Yes — it's completely free, with no sign-up and no watermark.
Are my files uploaded when I convert?
No. The conversion happens entirely in your browser; your file never leaves your device.
Does grayscale make the file smaller?
Often, yes — removing color usually reduces file size. For the smallest file, run the Compress tool as well.
Will the text still be selectable?
Pages are re-rendered as grayscale images, so text becomes part of the page image. Use OCR afterwards if you need selectable text.