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Convert PDF to grayscale

Choose an output resolution and create a grayscale copy. Higher DPI is sharper but produces a larger file.

No file bytes are sent to Lutrakit.

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Convert PDF pages to shades of gray

Make a grayscale copy when colour is unnecessary. Each PDF page is rendered as an image at the selected resolution and placed in a new PDF.

How to use it

  1. Choose one PDF and select 72, 150 or 300 DPI; the initial setting is 150 DPI.
  2. Run the conversion, then download the grayscale PDF.
  3. Zoom in on small text and compare charts with the original to check that important distinctions remain visible.

Example

Starting point
A two-page colour handout converted at 150 DPI.
What to expect
A two-page PDF containing grayscale page images. This describes the output structure; its size and legibility must be checked on the actual file.

Before you start

  • The input limit is 100 MiB; page count and decoded image size also depend on the device's processing budget.
  • The new pages are images: selectable text and vector shapes are not preserved as such. Higher DPI uses more memory and may create a larger file. Gray is not the same as two-colour black and white.