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Grayscale PDF

Please note: this conversion re-renders every page as an image, so text in the result is not selectable or searchable afterwards — the same trade-off as strong compression. Use it when you need a true black-and-white file (cheaper printing, fax-style documents), not for archiving text.

Choose a colour PDF and download a black-and-white copy: every page is converted to grayscale in your browser — nothing is uploaded, and your original file is never changed.

Make a true black-and-white copy of a colour PDF — for cheaper printing and clean, fax-style documents.

Part of the Toolz collection — free browser-based utilities.

100% free · No sign-up · No daily limits · No watermarks · Processed in your browser — files never leave your device

UNDERSTAND YOUR RESULTS

Grayscale PDF — Convert Colour to Black & White guide

Convert a colour PDF to a true black-and-white (grayscale) copy in your browser: cheaper to print, cleaner to fax or archive — with one honest trade-off, explained up front.

How to use this tool

  1. Choose or drop your colour PDF. The tool reads it locally and reports the page count.
  2. Pick the render quality: Standard is fastest, High suits most documents, Print renders at about 200 DPI for the crispest result at a larger file size.
  3. Click Convert to grayscale & download and keep the tab open while it works — the status counts through the pages.

A worked example

A 20-page colour brochure costs a fortune in colour toner for an internal review. The grayscale copy prints on the cheap black cartridge, the charts still read perfectly in shades of grey, and the colour original stays untouched for the client version.

How it works

Every page is rendered in your browser, each pixel’s colour is replaced by its luminance — the standard 0.299 red, 0.587 green, 0.114 blue weighting your eyes use — and the grayscale pages are assembled into a new PDF at the size of the originals. Saturated colours that share a luminance (a bright red and a mid green, say) become the same grey, which is simply what black-and-white means.

Frequently asked questions

Why is the text not selectable afterwards?

Grayscale conversion re-renders each page as an image and rebuilds its colours pixel by pixel — the honest way to guarantee a true black-and-white file. The pages become pictures, so their text is part of the picture.

Will it definitely contain no colour?

Yes — every pixel is replaced by a grey of equal luminance, so the output contains only black, white and greys. Printers and their drivers sometimes add colour back; set the printer itself to monochrome too, for belt and braces.

Which quality should I pick?

High (about 150 DPI) for documents you will read on screen or print once. Print (about 200 DPI) when the copy itself is the deliverable. Standard when speed matters more than crispness.

Does grayscale make the file smaller?

Not necessarily — re-rendered pages can be larger than the original, especially at Print quality. When file size is the goal, use Compress PDF; grayscale is about colour, not size.

Is my PDF uploaded?

No — rendering and conversion happen entirely in your browser.