About the Convert PDF to Grayscale
Grayscale conversion is useful for drafts, proofs and documents that will be printed on a mono printer. Pages are rendered, converted to luminance and rebuilt as a black-and-white PDF at the resolution you choose.
How to use it
- 1Open the PDFCheck the page count — very long documents take longer to render.
- 2Choose a resolution108 dpi keeps the file small; 200 dpi is better for readable printouts.
- 3Convert and downloadThe output is a grayscale PDF with one image per page.
Why use this convert pdf to grayscale?
- Nothing leaves your device. The work happens in your browser tab. There is no upload endpoint in this app, so your files and text cannot be stored, logged or seen by us.
- No upload wait. You skip the round trip to a server entirely. Results are limited by your own CPU, not by network speed or queue size.
- Free, no account, no quotas. No sign-up wall, no watermark, no daily limit. Optional accounts only exist to save favourites and presets across devices.
Frequently asked questions
Is my PDF safe to use here?
Yes. This tool runs entirely in your browser using JavaScript. Nothing you paste or open is sent to a server, and the page keeps no copy after you close it.
Do I need to create an account?
No. Every tool is fully usable without signing in. An account only adds saved favourites and reusable presets.
Does it work on a phone?
Yes. The interface is mobile-first with large touch targets and a stacked layout, so it works on phones and tablets as well as desktops.
Why does the file get smaller or larger?
Grayscale images compress differently from the original content. A vector-heavy colour PDF often shrinks; a small text PDF can grow because every page becomes an image.
Is the text still selectable?
No. Rasterising removes the text layer. If you need searchable grayscale text, print to a virtual PDF printer with a grayscale setting instead.